mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
perf/core improvements and fixes:
perf record: Alexey Budankov: - Fix binding of AIO user space buffers to nodes maps: Dominik b. Czarnota: - Fix off by one in strncpy() size argument. Arnaldo Carvalho de Melo: - Use strstarts() to look for Android libraries. Ian Rogers: - Give synthetic mmap events an inode generation. man pages: Ian Rogers: - Set man page date to last git commit. perf test: Ian Rogers: - Print if shell directory isn't present. perf report: Jin Yao: - Fix no branch type statistics report issue. perf expr: Jiri Olsa: - Fix copy/paste mistake vendor events: Kan Liang: - Support metric constraints. vendor events intel: Kan Liang: - Add NO_NMI_WATCHDOG metric constraint. vendor events s390: Thomas Richter: - Add new deflate counters for IBM z15. ARM cs-etm: Leo Yan: - Last branch improvements. intel-pt: Adrian Hunter: - Update intel-pt.txt file with new location of the documentation. - Add Intel PT man page references. - Rename intel-pt.txt and put it in man page format. perl scripting: Michael Petlan: - Add common_callchain to fix argument order. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQR2GiIUctdOfX2qHhGyPKLppCJ+JwUCXnFBiwAKCRCyPKLppCJ+ J4sOAQDTh5w3GFDOKzFHLqXWOE9mlsXnS7tHdkypuRweBpuQXQEA0Sq125ludwe7 pzZ1MFqZJ85lw0mfDqBV9E1PlgQz8Q8= =1uH9 -----END PGP SIGNATURE----- Merge tag 'perf-core-for-mingo-5.7-20200317' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: perf record: Alexey Budankov: - Fix binding of AIO user space buffers to nodes maps: Dominik b. Czarnota: - Fix off by one in strncpy() size argument. Arnaldo Carvalho de Melo: - Use strstarts() to look for Android libraries. Ian Rogers: - Give synthetic mmap events an inode generation. man pages: Ian Rogers: - Set man page date to last git commit. perf test: Ian Rogers: - Print if shell directory isn't present. perf report: Jin Yao: - Fix no branch type statistics report issue. perf expr: Jiri Olsa: - Fix copy/paste mistake vendor events: Kan Liang: - Support metric constraints. vendor events intel: Kan Liang: - Add NO_NMI_WATCHDOG metric constraint. vendor events s390: Thomas Richter: - Add new deflate counters for IBM z15. ARM cs-etm: Leo Yan: - Last branch improvements. intel-pt: Adrian Hunter: - Update intel-pt.txt file with new location of the documentation. - Add Intel PT man page references. - Rename intel-pt.txt and put it in man page format. perl scripting: Michael Petlan: - Add common_callchain to fix argument order. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Conflicts: tools/perf/util/map.c
This commit is contained in:
Ingo Molnar
commit
d1c9f7d117
@ -295,7 +295,10 @@ $(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : $(OUTPUT)%.xml
|
||||
$(OUTPUT)%.xml : %.txt
|
||||
$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
|
||||
$(ASCIIDOC) -b docbook -d manpage \
|
||||
$(ASCIIDOC_EXTRA) -aperf_version=$(PERF_VERSION) -o $@+ $< && \
|
||||
$(ASCIIDOC_EXTRA) -aperf_version=$(PERF_VERSION) \
|
||||
-aperf_date=$(shell git log -1 --pretty="format:%cd" \
|
||||
--date=short $<) \
|
||||
-o $@+ $< && \
|
||||
mv $@+ $@
|
||||
|
||||
XSLT = docbook.xsl
|
||||
|
||||
@ -1,991 +1 @@
|
||||
Intel Processor Trace
|
||||
=====================
|
||||
|
||||
Overview
|
||||
========
|
||||
|
||||
Intel Processor Trace (Intel PT) is an extension of Intel Architecture that
|
||||
collects information about software execution such as control flow, execution
|
||||
modes and timings and formats it into highly compressed binary packets.
|
||||
Technical details are documented in the Intel 64 and IA-32 Architectures
|
||||
Software Developer Manuals, Chapter 36 Intel Processor Trace.
|
||||
|
||||
Intel PT is first supported in Intel Core M and 5th generation Intel Core
|
||||
processors that are based on the Intel micro-architecture code name Broadwell.
|
||||
|
||||
Trace data is collected by 'perf record' and stored within the perf.data file.
|
||||
See below for options to 'perf record'.
|
||||
|
||||
Trace data must be 'decoded' which involves walking the object code and matching
|
||||
the trace data packets. For example a TNT packet only tells whether a
|
||||
conditional branch was taken or not taken, so to make use of that packet the
|
||||
decoder must know precisely which instruction was being executed.
|
||||
|
||||
Decoding is done on-the-fly. The decoder outputs samples in the same format as
|
||||
samples output by perf hardware events, for example as though the "instructions"
|
||||
or "branches" events had been recorded. Presently 3 tools support this:
|
||||
'perf script', 'perf report' and 'perf inject'. See below for more information
|
||||
on using those tools.
|
||||
|
||||
The main distinguishing feature of Intel PT is that the decoder can determine
|
||||
the exact flow of software execution. Intel PT can be used to understand why
|
||||
and how did software get to a certain point, or behave a certain way. The
|
||||
software does not have to be recompiled, so Intel PT works with debug or release
|
||||
builds, however the executed images are needed - which makes use in JIT-compiled
|
||||
environments, or with self-modified code, a challenge. Also symbols need to be
|
||||
provided to make sense of addresses.
|
||||
|
||||
A limitation of Intel PT is that it produces huge amounts of trace data
|
||||
(hundreds of megabytes per second per core) which takes a long time to decode,
|
||||
for example two or three orders of magnitude longer than it took to collect.
|
||||
Another limitation is the performance impact of tracing, something that will
|
||||
vary depending on the use-case and architecture.
|
||||
|
||||
|
||||
Quickstart
|
||||
==========
|
||||
|
||||
It is important to start small. That is because it is easy to capture vastly
|
||||
more data than can possibly be processed.
|
||||
|
||||
The simplest thing to do with Intel PT is userspace profiling of small programs.
|
||||
Data is captured with 'perf record' e.g. to trace 'ls' userspace-only:
|
||||
|
||||
perf record -e intel_pt//u ls
|
||||
|
||||
And profiled with 'perf report' e.g.
|
||||
|
||||
perf report
|
||||
|
||||
To also trace kernel space presents a problem, namely kernel self-modifying
|
||||
code. A fairly good kernel image is available in /proc/kcore but to get an
|
||||
accurate image a copy of /proc/kcore needs to be made under the same conditions
|
||||
as the data capture. A script perf-with-kcore can do that, but beware that the
|
||||
script makes use of 'sudo' to copy /proc/kcore. If you have perf installed
|
||||
locally from the source tree you can do:
|
||||
|
||||
~/libexec/perf-core/perf-with-kcore record pt_ls -e intel_pt// -- ls
|
||||
|
||||
which will create a directory named 'pt_ls' and put the perf.data file and
|
||||
copies of /proc/kcore, /proc/kallsyms and /proc/modules into it. Then to use
|
||||
'perf report' becomes:
|
||||
|
||||
~/libexec/perf-core/perf-with-kcore report pt_ls
|
||||
|
||||
Because samples are synthesized after-the-fact, the sampling period can be
|
||||
selected for reporting. e.g. sample every microsecond
|
||||
|
||||
~/libexec/perf-core/perf-with-kcore report pt_ls --itrace=i1usge
|
||||
|
||||
See the sections below for more information about the --itrace option.
|
||||
|
||||
Beware the smaller the period, the more samples that are produced, and the
|
||||
longer it takes to process them.
|
||||
|
||||
Also note that the coarseness of Intel PT timing information will start to
|
||||
distort the statistical value of the sampling as the sampling period becomes
|
||||
smaller.
|
||||
|
||||
To represent software control flow, "branches" samples are produced. By default
|
||||
a branch sample is synthesized for every single branch. To get an idea what
|
||||
data is available you can use the 'perf script' tool with all itrace sampling
|
||||
options, which will list all the samples.
|
||||
|
||||
perf record -e intel_pt//u ls
|
||||
perf script --itrace=ibxwpe
|
||||
|
||||
An interesting field that is not printed by default is 'flags' which can be
|
||||
displayed as follows:
|
||||
|
||||
perf script --itrace=ibxwpe -F+flags
|
||||
|
||||
The flags are "bcrosyiABEx" which stand for branch, call, return, conditional,
|
||||
system, asynchronous, interrupt, transaction abort, trace begin, trace end, and
|
||||
in transaction, respectively.
|
||||
|
||||
Another interesting field that is not printed by default is 'ipc' which can be
|
||||
displayed as follows:
|
||||
|
||||
perf script --itrace=be -F+ipc
|
||||
|
||||
There are two ways that instructions-per-cycle (IPC) can be calculated depending
|
||||
on the recording.
|
||||
|
||||
If the 'cyc' config term (see config terms section below) was used, then IPC is
|
||||
calculated using the cycle count from CYC packets, otherwise MTC packets are
|
||||
used - refer to the 'mtc' config term. When MTC is used, however, the values
|
||||
are less accurate because the timing is less accurate.
|
||||
|
||||
Because Intel PT does not update the cycle count on every branch or instruction,
|
||||
the values will often be zero. When there are values, they will be the number
|
||||
of instructions and number of cycles since the last update, and thus represent
|
||||
the average IPC since the last IPC for that event type. Note IPC for "branches"
|
||||
events is calculated separately from IPC for "instructions" events.
|
||||
|
||||
Also note that the IPC instruction count may or may not include the current
|
||||
instruction. If the cycle count is associated with an asynchronous branch
|
||||
(e.g. page fault or interrupt), then the instruction count does not include the
|
||||
current instruction, otherwise it does. That is consistent with whether or not
|
||||
that instruction has retired when the cycle count is updated.
|
||||
|
||||
Another note, in the case of "branches" events, non-taken branches are not
|
||||
presently sampled, so IPC values for them do not appear e.g. a CYC packet with a
|
||||
TNT packet that starts with a non-taken branch. To see every possible IPC
|
||||
value, "instructions" events can be used e.g. --itrace=i0ns
|
||||
|
||||
While it is possible to create scripts to analyze the data, an alternative
|
||||
approach is available to export the data to a sqlite or postgresql database.
|
||||
Refer to script export-to-sqlite.py or export-to-postgresql.py for more details,
|
||||
and to script exported-sql-viewer.py for an example of using the database.
|
||||
|
||||
There is also script intel-pt-events.py which provides an example of how to
|
||||
unpack the raw data for power events and PTWRITE.
|
||||
|
||||
As mentioned above, it is easy to capture too much data. One way to limit the
|
||||
data captured is to use 'snapshot' mode which is explained further below.
|
||||
Refer to 'new snapshot option' and 'Intel PT modes of operation' further below.
|
||||
|
||||
Another problem that will be experienced is decoder errors. They can be caused
|
||||
by inability to access the executed image, self-modified or JIT-ed code, or the
|
||||
inability to match side-band information (such as context switches and mmaps)
|
||||
which results in the decoder not knowing what code was executed.
|
||||
|
||||
There is also the problem of perf not being able to copy the data fast enough,
|
||||
resulting in data lost because the buffer was full. See 'Buffer handling' below
|
||||
for more details.
|
||||
|
||||
|
||||
perf record
|
||||
===========
|
||||
|
||||
new event
|
||||
---------
|
||||
|
||||
The Intel PT kernel driver creates a new PMU for Intel PT. PMU events are
|
||||
selected by providing the PMU name followed by the "config" separated by slashes.
|
||||
An enhancement has been made to allow default "config" e.g. the option
|
||||
|
||||
-e intel_pt//
|
||||
|
||||
will use a default config value. Currently that is the same as
|
||||
|
||||
-e intel_pt/tsc,noretcomp=0/
|
||||
|
||||
which is the same as
|
||||
|
||||
-e intel_pt/tsc=1,noretcomp=0/
|
||||
|
||||
Note there are now new config terms - see section 'config terms' further below.
|
||||
|
||||
The config terms are listed in /sys/devices/intel_pt/format. They are bit
|
||||
fields within the config member of the struct perf_event_attr which is
|
||||
passed to the kernel by the perf_event_open system call. They correspond to bit
|
||||
fields in the IA32_RTIT_CTL MSR. Here is a list of them and their definitions:
|
||||
|
||||
$ grep -H . /sys/bus/event_source/devices/intel_pt/format/*
|
||||
/sys/bus/event_source/devices/intel_pt/format/cyc:config:1
|
||||
/sys/bus/event_source/devices/intel_pt/format/cyc_thresh:config:19-22
|
||||
/sys/bus/event_source/devices/intel_pt/format/mtc:config:9
|
||||
/sys/bus/event_source/devices/intel_pt/format/mtc_period:config:14-17
|
||||
/sys/bus/event_source/devices/intel_pt/format/noretcomp:config:11
|
||||
/sys/bus/event_source/devices/intel_pt/format/psb_period:config:24-27
|
||||
/sys/bus/event_source/devices/intel_pt/format/tsc:config:10
|
||||
|
||||
Note that the default config must be overridden for each term i.e.
|
||||
|
||||
-e intel_pt/noretcomp=0/
|
||||
|
||||
is the same as:
|
||||
|
||||
-e intel_pt/tsc=1,noretcomp=0/
|
||||
|
||||
So, to disable TSC packets use:
|
||||
|
||||
-e intel_pt/tsc=0/
|
||||
|
||||
It is also possible to specify the config value explicitly:
|
||||
|
||||
-e intel_pt/config=0x400/
|
||||
|
||||
Note that, as with all events, the event is suffixed with event modifiers:
|
||||
|
||||
u userspace
|
||||
k kernel
|
||||
h hypervisor
|
||||
G guest
|
||||
H host
|
||||
p precise ip
|
||||
|
||||
'h', 'G' and 'H' are for virtualization which is not supported by Intel PT.
|
||||
'p' is also not relevant to Intel PT. So only options 'u' and 'k' are
|
||||
meaningful for Intel PT.
|
||||
|
||||
perf_event_attr is displayed if the -vv option is used e.g.
|
||||
|
||||
------------------------------------------------------------
|
||||
perf_event_attr:
|
||||
type 6
|
||||
size 112
|
||||
config 0x400
|
||||
{ sample_period, sample_freq } 1
|
||||
sample_type IP|TID|TIME|CPU|IDENTIFIER
|
||||
read_format ID
|
||||
disabled 1
|
||||
inherit 1
|
||||
exclude_kernel 1
|
||||
exclude_hv 1
|
||||
enable_on_exec 1
|
||||
sample_id_all 1
|
||||
------------------------------------------------------------
|
||||
sys_perf_event_open: pid 31104 cpu 0 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 1 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 2 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 3 group_fd -1 flags 0x8
|
||||
------------------------------------------------------------
|
||||
|
||||
|
||||
config terms
|
||||
------------
|
||||
|
||||
The June 2015 version of Intel 64 and IA-32 Architectures Software Developer
|
||||
Manuals, Chapter 36 Intel Processor Trace, defined new Intel PT features.
|
||||
Some of the features are reflect in new config terms. All the config terms are
|
||||
described below.
|
||||
|
||||
tsc Always supported. Produces TSC timestamp packets to provide
|
||||
timing information. In some cases it is possible to decode
|
||||
without timing information, for example a per-thread context
|
||||
that does not overlap executable memory maps.
|
||||
|
||||
The default config selects tsc (i.e. tsc=1).
|
||||
|
||||
noretcomp Always supported. Disables "return compression" so a TIP packet
|
||||
is produced when a function returns. Causes more packets to be
|
||||
produced but might make decoding more reliable.
|
||||
|
||||
The default config does not select noretcomp (i.e. noretcomp=0).
|
||||
|
||||
psb_period Allows the frequency of PSB packets to be specified.
|
||||
|
||||
The PSB packet is a synchronization packet that provides a
|
||||
starting point for decoding or recovery from errors.
|
||||
|
||||
Support for psb_period is indicated by:
|
||||
|
||||
/sys/bus/event_source/devices/intel_pt/caps/psb_cyc
|
||||
|
||||
which contains "1" if the feature is supported and "0"
|
||||
otherwise.
|
||||
|
||||
Valid values are given by:
|
||||
|
||||
/sys/bus/event_source/devices/intel_pt/caps/psb_periods
|
||||
|
||||
which contains a hexadecimal value, the bits of which represent
|
||||
valid values e.g. bit 2 set means value 2 is valid.
|
||||
|
||||
The psb_period value is converted to the approximate number of
|
||||
trace bytes between PSB packets as:
|
||||
|
||||
2 ^ (value + 11)
|
||||
|
||||
e.g. value 3 means 16KiB bytes between PSBs
|
||||
|
||||
If an invalid value is entered, the error message
|
||||
will give a list of valid values e.g.
|
||||
|
||||
$ perf record -e intel_pt/psb_period=15/u uname
|
||||
Invalid psb_period for intel_pt. Valid values are: 0-5
|
||||
|
||||
If MTC packets are selected, the default config selects a value
|
||||
of 3 (i.e. psb_period=3) or the nearest lower value that is
|
||||
supported (0 is always supported). Otherwise the default is 0.
|
||||
|
||||
If decoding is expected to be reliable and the buffer is large
|
||||
then a large PSB period can be used.
|
||||
|
||||
Because a TSC packet is produced with PSB, the PSB period can
|
||||
also affect the granularity to timing information in the absence
|
||||
of MTC or CYC.
|
||||
|
||||
mtc Produces MTC timing packets.
|
||||
|
||||
MTC packets provide finer grain timestamp information than TSC
|
||||
packets. MTC packets record time using the hardware crystal
|
||||
clock (CTC) which is related to TSC packets using a TMA packet.
|
||||
|
||||
Support for this feature is indicated by:
|
||||
|
||||
/sys/bus/event_source/devices/intel_pt/caps/mtc
|
||||
|
||||
which contains "1" if the feature is supported and
|
||||
"0" otherwise.
|
||||
|
||||
The frequency of MTC packets can also be specified - see
|
||||
mtc_period below.
|
||||
|
||||
mtc_period Specifies how frequently MTC packets are produced - see mtc
|
||||
above for how to determine if MTC packets are supported.
|
||||
|
||||
Valid values are given by:
|
||||
|
||||
/sys/bus/event_source/devices/intel_pt/caps/mtc_periods
|
||||
|
||||
which contains a hexadecimal value, the bits of which represent
|
||||
valid values e.g. bit 2 set means value 2 is valid.
|
||||
|
||||
The mtc_period value is converted to the MTC frequency as:
|
||||
|
||||
CTC-frequency / (2 ^ value)
|
||||
|
||||
e.g. value 3 means one eighth of CTC-frequency
|
||||
|
||||
Where CTC is the hardware crystal clock, the frequency of which
|
||||
can be related to TSC via values provided in cpuid leaf 0x15.
|
||||
|
||||
If an invalid value is entered, the error message
|
||||
will give a list of valid values e.g.
|
||||
|
||||
$ perf record -e intel_pt/mtc_period=15/u uname
|
||||
Invalid mtc_period for intel_pt. Valid values are: 0,3,6,9
|
||||
|
||||
The default value is 3 or the nearest lower value
|
||||
that is supported (0 is always supported).
|
||||
|
||||
cyc Produces CYC timing packets.
|
||||
|
||||
CYC packets provide even finer grain timestamp information than
|
||||
MTC and TSC packets. A CYC packet contains the number of CPU
|
||||
cycles since the last CYC packet. Unlike MTC and TSC packets,
|
||||
CYC packets are only sent when another packet is also sent.
|
||||
|
||||
Support for this feature is indicated by:
|
||||
|
||||
/sys/bus/event_source/devices/intel_pt/caps/psb_cyc
|
||||
|
||||
which contains "1" if the feature is supported and
|
||||
"0" otherwise.
|
||||
|
||||
The number of CYC packets produced can be reduced by specifying
|
||||
a threshold - see cyc_thresh below.
|
||||
|
||||
cyc_thresh Specifies how frequently CYC packets are produced - see cyc
|
||||
above for how to determine if CYC packets are supported.
|
||||
|
||||
Valid cyc_thresh values are given by:
|
||||
|
||||
/sys/bus/event_source/devices/intel_pt/caps/cycle_thresholds
|
||||
|
||||
which contains a hexadecimal value, the bits of which represent
|
||||
valid values e.g. bit 2 set means value 2 is valid.
|
||||
|
||||
The cyc_thresh value represents the minimum number of CPU cycles
|
||||
that must have passed before a CYC packet can be sent. The
|
||||
number of CPU cycles is:
|
||||
|
||||
2 ^ (value - 1)
|
||||
|
||||
e.g. value 4 means 8 CPU cycles must pass before a CYC packet
|
||||
can be sent. Note a CYC packet is still only sent when another
|
||||
packet is sent, not at, e.g. every 8 CPU cycles.
|
||||
|
||||
If an invalid value is entered, the error message
|
||||
will give a list of valid values e.g.
|
||||
|
||||
$ perf record -e intel_pt/cyc,cyc_thresh=15/u uname
|
||||
Invalid cyc_thresh for intel_pt. Valid values are: 0-12
|
||||
|
||||
CYC packets are not requested by default.
|
||||
|
||||
pt Specifies pass-through which enables the 'branch' config term.
|
||||
|
||||
The default config selects 'pt' if it is available, so a user will
|
||||
never need to specify this term.
|
||||
|
||||
branch Enable branch tracing. Branch tracing is enabled by default so to
|
||||
disable branch tracing use 'branch=0'.
|
||||
|
||||
The default config selects 'branch' if it is available.
|
||||
|
||||
ptw Enable PTWRITE packets which are produced when a ptwrite instruction
|
||||
is executed.
|
||||
|
||||
Support for this feature is indicated by:
|
||||
|
||||
/sys/bus/event_source/devices/intel_pt/caps/ptwrite
|
||||
|
||||
which contains "1" if the feature is supported and
|
||||
"0" otherwise.
|
||||
|
||||
fup_on_ptw Enable a FUP packet to follow the PTWRITE packet. The FUP packet
|
||||
provides the address of the ptwrite instruction. In the absence of
|
||||
fup_on_ptw, the decoder will use the address of the previous branch
|
||||
if branch tracing is enabled, otherwise the address will be zero.
|
||||
Note that fup_on_ptw will work even when branch tracing is disabled.
|
||||
|
||||
pwr_evt Enable power events. The power events provide information about
|
||||
changes to the CPU C-state.
|
||||
|
||||
Support for this feature is indicated by:
|
||||
|
||||
/sys/bus/event_source/devices/intel_pt/caps/power_event_trace
|
||||
|
||||
which contains "1" if the feature is supported and
|
||||
"0" otherwise.
|
||||
|
||||
|
||||
AUX area sampling option
|
||||
------------------------
|
||||
|
||||
To select Intel PT "sampling" the AUX area sampling option can be used:
|
||||
|
||||
--aux-sample
|
||||
|
||||
Optionally it can be followed by the sample size in bytes e.g.
|
||||
|
||||
--aux-sample=8192
|
||||
|
||||
In addition, the Intel PT event to sample must be defined e.g.
|
||||
|
||||
-e intel_pt//u
|
||||
|
||||
Samples on other events will be created containing Intel PT data e.g. the
|
||||
following will create Intel PT samples on the branch-misses event, note the
|
||||
events must be grouped using {}:
|
||||
|
||||
perf record --aux-sample -e '{intel_pt//u,branch-misses:u}'
|
||||
|
||||
An alternative to '--aux-sample' is to add the config term 'aux-sample-size' to
|
||||
events. In this case, the grouping is implied e.g.
|
||||
|
||||
perf record -e intel_pt//u -e branch-misses/aux-sample-size=8192/u
|
||||
|
||||
is the same as:
|
||||
|
||||
perf record -e '{intel_pt//u,branch-misses/aux-sample-size=8192/u}'
|
||||
|
||||
but allows for also using an address filter e.g.:
|
||||
|
||||
perf record -e intel_pt//u --filter 'filter * @/bin/ls' -e branch-misses/aux-sample-size=8192/u -- ls
|
||||
|
||||
It is important to select a sample size that is big enough to contain at least
|
||||
one PSB packet. If not a warning will be displayed:
|
||||
|
||||
Intel PT sample size (%zu) may be too small for PSB period (%zu)
|
||||
|
||||
The calculation used for that is: if sample_size <= psb_period + 256 display the
|
||||
warning. When sampling is used, psb_period defaults to 0 (2KiB).
|
||||
|
||||
The default sample size is 4KiB.
|
||||
|
||||
The sample size is passed in aux_sample_size in struct perf_event_attr. The
|
||||
sample size is limited by the maximum event size which is 64KiB. It is
|
||||
difficult to know how big the event might be without the trace sample attached,
|
||||
but the tool validates that the sample size is not greater than 60KiB.
|
||||
|
||||
|
||||
new snapshot option
|
||||
-------------------
|
||||
|
||||
The difference between full trace and snapshot from the kernel's perspective is
|
||||
that in full trace we don't overwrite trace data that the user hasn't collected
|
||||
yet (and indicated that by advancing aux_tail), whereas in snapshot mode we let
|
||||
the trace run and overwrite older data in the buffer so that whenever something
|
||||
interesting happens, we can stop it and grab a snapshot of what was going on
|
||||
around that interesting moment.
|
||||
|
||||
To select snapshot mode a new option has been added:
|
||||
|
||||
-S
|
||||
|
||||
Optionally it can be followed by the snapshot size e.g.
|
||||
|
||||
-S0x100000
|
||||
|
||||
The default snapshot size is the auxtrace mmap size. If neither auxtrace mmap size
|
||||
nor snapshot size is specified, then the default is 4MiB for privileged users
|
||||
(or if /proc/sys/kernel/perf_event_paranoid < 0), 128KiB for unprivileged users.
|
||||
If an unprivileged user does not specify mmap pages, the mmap pages will be
|
||||
reduced as described in the 'new auxtrace mmap size option' section below.
|
||||
|
||||
The snapshot size is displayed if the option -vv is used e.g.
|
||||
|
||||
Intel PT snapshot size: %zu
|
||||
|
||||
|
||||
new auxtrace mmap size option
|
||||
---------------------------
|
||||
|
||||
Intel PT buffer size is specified by an addition to the -m option e.g.
|
||||
|
||||
-m,16
|
||||
|
||||
selects a buffer size of 16 pages i.e. 64KiB.
|
||||
|
||||
Note that the existing functionality of -m is unchanged. The auxtrace mmap size
|
||||
is specified by the optional addition of a comma and the value.
|
||||
|
||||
The default auxtrace mmap size for Intel PT is 4MiB/page_size for privileged users
|
||||
(or if /proc/sys/kernel/perf_event_paranoid < 0), 128KiB for unprivileged users.
|
||||
If an unprivileged user does not specify mmap pages, the mmap pages will be
|
||||
reduced from the default 512KiB/page_size to 256KiB/page_size, otherwise the
|
||||
user is likely to get an error as they exceed their mlock limit (Max locked
|
||||
memory as shown in /proc/self/limits). Note that perf does not count the first
|
||||
512KiB (actually /proc/sys/kernel/perf_event_mlock_kb minus 1 page) per cpu
|
||||
against the mlock limit so an unprivileged user is allowed 512KiB per cpu plus
|
||||
their mlock limit (which defaults to 64KiB but is not multiplied by the number
|
||||
of cpus).
|
||||
|
||||
In full-trace mode, powers of two are allowed for buffer size, with a minimum
|
||||
size of 2 pages. In snapshot mode or sampling mode, it is the same but the
|
||||
minimum size is 1 page.
|
||||
|
||||
The mmap size and auxtrace mmap size are displayed if the -vv option is used e.g.
|
||||
|
||||
mmap length 528384
|
||||
auxtrace mmap length 4198400
|
||||
|
||||
|
||||
Intel PT modes of operation
|
||||
---------------------------
|
||||
|
||||
Intel PT can be used in 2 modes:
|
||||
full-trace mode
|
||||
sample mode
|
||||
snapshot mode
|
||||
|
||||
Full-trace mode traces continuously e.g.
|
||||
|
||||
perf record -e intel_pt//u uname
|
||||
|
||||
Sample mode attaches a Intel PT sample to other events e.g.
|
||||
|
||||
perf record --aux-sample -e intel_pt//u -e branch-misses:u
|
||||
|
||||
Snapshot mode captures the available data when a signal is sent e.g.
|
||||
|
||||
perf record -v -e intel_pt//u -S ./loopy 1000000000 &
|
||||
[1] 11435
|
||||
kill -USR2 11435
|
||||
Recording AUX area tracing snapshot
|
||||
|
||||
Note that the signal sent is SIGUSR2.
|
||||
Note that "Recording AUX area tracing snapshot" is displayed because the -v
|
||||
option is used.
|
||||
|
||||
The 2 modes cannot be used together.
|
||||
|
||||
|
||||
Buffer handling
|
||||
---------------
|
||||
|
||||
There may be buffer limitations (i.e. single ToPa entry) which means that actual
|
||||
buffer sizes are limited to powers of 2 up to 4MiB (MAX_ORDER). In order to
|
||||
provide other sizes, and in particular an arbitrarily large size, multiple
|
||||
buffers are logically concatenated. However an interrupt must be used to switch
|
||||
between buffers. That has two potential problems:
|
||||
a) the interrupt may not be handled in time so that the current buffer
|
||||
becomes full and some trace data is lost.
|
||||
b) the interrupts may slow the system and affect the performance
|
||||
results.
|
||||
|
||||
If trace data is lost, the driver sets 'truncated' in the PERF_RECORD_AUX event
|
||||
which the tools report as an error.
|
||||
|
||||
In full-trace mode, the driver waits for data to be copied out before allowing
|
||||
the (logical) buffer to wrap-around. If data is not copied out quickly enough,
|
||||
again 'truncated' is set in the PERF_RECORD_AUX event. If the driver has to
|
||||
wait, the intel_pt event gets disabled. Because it is difficult to know when
|
||||
that happens, perf tools always re-enable the intel_pt event after copying out
|
||||
data.
|
||||
|
||||
|
||||
Intel PT and build ids
|
||||
----------------------
|
||||
|
||||
By default "perf record" post-processes the event stream to find all build ids
|
||||
for executables for all addresses sampled. Deliberately, Intel PT is not
|
||||
decoded for that purpose (it would take too long). Instead the build ids for
|
||||
all executables encountered (due to mmap, comm or task events) are included
|
||||
in the perf.data file.
|
||||
|
||||
To see buildids included in the perf.data file use the command:
|
||||
|
||||
perf buildid-list
|
||||
|
||||
If the perf.data file contains Intel PT data, that is the same as:
|
||||
|
||||
perf buildid-list --with-hits
|
||||
|
||||
|
||||
Snapshot mode and event disabling
|
||||
---------------------------------
|
||||
|
||||
In order to make a snapshot, the intel_pt event is disabled using an IOCTL,
|
||||
namely PERF_EVENT_IOC_DISABLE. However doing that can also disable the
|
||||
collection of side-band information. In order to prevent that, a dummy
|
||||
software event has been introduced that permits tracking events (like mmaps) to
|
||||
continue to be recorded while intel_pt is disabled. That is important to ensure
|
||||
there is complete side-band information to allow the decoding of subsequent
|
||||
snapshots.
|
||||
|
||||
A test has been created for that. To find the test:
|
||||
|
||||
perf test list
|
||||
...
|
||||
23: Test using a dummy software event to keep tracking
|
||||
|
||||
To run the test:
|
||||
|
||||
perf test 23
|
||||
23: Test using a dummy software event to keep tracking : Ok
|
||||
|
||||
|
||||
perf record modes (nothing new here)
|
||||
------------------------------------
|
||||
|
||||
perf record essentially operates in one of three modes:
|
||||
per thread
|
||||
per cpu
|
||||
workload only
|
||||
|
||||
"per thread" mode is selected by -t or by --per-thread (with -p or -u or just a
|
||||
workload).
|
||||
"per cpu" is selected by -C or -a.
|
||||
"workload only" mode is selected by not using the other options but providing a
|
||||
command to run (i.e. the workload).
|
||||
|
||||
In per-thread mode an exact list of threads is traced. There is no inheritance.
|
||||
Each thread has its own event buffer.
|
||||
|
||||
In per-cpu mode all processes (or processes from the selected cgroup i.e. -G
|
||||
option, or processes selected with -p or -u) are traced. Each cpu has its own
|
||||
buffer. Inheritance is allowed.
|
||||
|
||||
In workload-only mode, the workload is traced but with per-cpu buffers.
|
||||
Inheritance is allowed. Note that you can now trace a workload in per-thread
|
||||
mode by using the --per-thread option.
|
||||
|
||||
|
||||
Privileged vs non-privileged users
|
||||
----------------------------------
|
||||
|
||||
Unless /proc/sys/kernel/perf_event_paranoid is set to -1, unprivileged users
|
||||
have memory limits imposed upon them. That affects what buffer sizes they can
|
||||
have as outlined above.
|
||||
|
||||
The v4.2 kernel introduced support for a context switch metadata event,
|
||||
PERF_RECORD_SWITCH, which allows unprivileged users to see when their processes
|
||||
are scheduled out and in, just not by whom, which is left for the
|
||||
PERF_RECORD_SWITCH_CPU_WIDE, that is only accessible in system wide context,
|
||||
which in turn requires CAP_SYS_ADMIN.
|
||||
|
||||
Please see the 45ac1403f564 ("perf: Add PERF_RECORD_SWITCH to indicate context
|
||||
switches") commit, that introduces these metadata events for further info.
|
||||
|
||||
When working with kernels < v4.2, the following considerations must be taken,
|
||||
as the sched:sched_switch tracepoints will be used to receive such information:
|
||||
|
||||
Unless /proc/sys/kernel/perf_event_paranoid is set to -1, unprivileged users are
|
||||
not permitted to use tracepoints which means there is insufficient side-band
|
||||
information to decode Intel PT in per-cpu mode, and potentially workload-only
|
||||
mode too if the workload creates new processes.
|
||||
|
||||
Note also, that to use tracepoints, read-access to debugfs is required. So if
|
||||
debugfs is not mounted or the user does not have read-access, it will again not
|
||||
be possible to decode Intel PT in per-cpu mode.
|
||||
|
||||
|
||||
sched_switch tracepoint
|
||||
-----------------------
|
||||
|
||||
The sched_switch tracepoint is used to provide side-band data for Intel PT
|
||||
decoding in kernels where the PERF_RECORD_SWITCH metadata event isn't
|
||||
available.
|
||||
|
||||
The sched_switch events are automatically added. e.g. the second event shown
|
||||
below:
|
||||
|
||||
$ perf record -vv -e intel_pt//u uname
|
||||
------------------------------------------------------------
|
||||
perf_event_attr:
|
||||
type 6
|
||||
size 112
|
||||
config 0x400
|
||||
{ sample_period, sample_freq } 1
|
||||
sample_type IP|TID|TIME|CPU|IDENTIFIER
|
||||
read_format ID
|
||||
disabled 1
|
||||
inherit 1
|
||||
exclude_kernel 1
|
||||
exclude_hv 1
|
||||
enable_on_exec 1
|
||||
sample_id_all 1
|
||||
------------------------------------------------------------
|
||||
sys_perf_event_open: pid 31104 cpu 0 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 1 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 2 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 3 group_fd -1 flags 0x8
|
||||
------------------------------------------------------------
|
||||
perf_event_attr:
|
||||
type 2
|
||||
size 112
|
||||
config 0x108
|
||||
{ sample_period, sample_freq } 1
|
||||
sample_type IP|TID|TIME|CPU|PERIOD|RAW|IDENTIFIER
|
||||
read_format ID
|
||||
inherit 1
|
||||
sample_id_all 1
|
||||
exclude_guest 1
|
||||
------------------------------------------------------------
|
||||
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid -1 cpu 1 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid -1 cpu 2 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid -1 cpu 3 group_fd -1 flags 0x8
|
||||
------------------------------------------------------------
|
||||
perf_event_attr:
|
||||
type 1
|
||||
size 112
|
||||
config 0x9
|
||||
{ sample_period, sample_freq } 1
|
||||
sample_type IP|TID|TIME|IDENTIFIER
|
||||
read_format ID
|
||||
disabled 1
|
||||
inherit 1
|
||||
exclude_kernel 1
|
||||
exclude_hv 1
|
||||
mmap 1
|
||||
comm 1
|
||||
enable_on_exec 1
|
||||
task 1
|
||||
sample_id_all 1
|
||||
mmap2 1
|
||||
comm_exec 1
|
||||
------------------------------------------------------------
|
||||
sys_perf_event_open: pid 31104 cpu 0 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 1 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 2 group_fd -1 flags 0x8
|
||||
sys_perf_event_open: pid 31104 cpu 3 group_fd -1 flags 0x8
|
||||
mmap size 528384B
|
||||
AUX area mmap length 4194304
|
||||
perf event ring buffer mmapped per cpu
|
||||
Synthesizing auxtrace information
|
||||
Linux
|
||||
[ perf record: Woken up 1 times to write data ]
|
||||
[ perf record: Captured and wrote 0.042 MB perf.data ]
|
||||
|
||||
Note, the sched_switch event is only added if the user is permitted to use it
|
||||
and only in per-cpu mode.
|
||||
|
||||
Note also, the sched_switch event is only added if TSC packets are requested.
|
||||
That is because, in the absence of timing information, the sched_switch events
|
||||
cannot be matched against the Intel PT trace.
|
||||
|
||||
|
||||
perf script
|
||||
===========
|
||||
|
||||
By default, perf script will decode trace data found in the perf.data file.
|
||||
This can be further controlled by new option --itrace.
|
||||
|
||||
|
||||
New --itrace option
|
||||
-------------------
|
||||
|
||||
Having no option is the same as
|
||||
|
||||
--itrace
|
||||
|
||||
which, in turn, is the same as
|
||||
|
||||
--itrace=cepwx
|
||||
|
||||
The letters are:
|
||||
|
||||
i synthesize "instructions" events
|
||||
b synthesize "branches" events
|
||||
x synthesize "transactions" events
|
||||
w synthesize "ptwrite" events
|
||||
p synthesize "power" events
|
||||
c synthesize branches events (calls only)
|
||||
r synthesize branches events (returns only)
|
||||
e synthesize tracing error events
|
||||
d create a debug log
|
||||
g synthesize a call chain (use with i or x)
|
||||
l synthesize last branch entries (use with i or x)
|
||||
s skip initial number of events
|
||||
|
||||
"Instructions" events look like they were recorded by "perf record -e
|
||||
instructions".
|
||||
|
||||
"Branches" events look like they were recorded by "perf record -e branches". "c"
|
||||
and "r" can be combined to get calls and returns.
|
||||
|
||||
"Transactions" events correspond to the start or end of transactions. The
|
||||
'flags' field can be used in perf script to determine whether the event is a
|
||||
tranasaction start, commit or abort.
|
||||
|
||||
Note that "instructions", "branches" and "transactions" events depend on code
|
||||
flow packets which can be disabled by using the config term "branch=0". Refer
|
||||
to the config terms section above.
|
||||
|
||||
"ptwrite" events record the payload of the ptwrite instruction and whether
|
||||
"fup_on_ptw" was used. "ptwrite" events depend on PTWRITE packets which are
|
||||
recorded only if the "ptw" config term was used. Refer to the config terms
|
||||
section above. perf script "synth" field displays "ptwrite" information like
|
||||
this: "ip: 0 payload: 0x123456789abcdef0" where "ip" is 1 if "fup_on_ptw" was
|
||||
used.
|
||||
|
||||
"Power" events correspond to power event packets and CBR (core-to-bus ratio)
|
||||
packets. While CBR packets are always recorded when tracing is enabled, power
|
||||
event packets are recorded only if the "pwr_evt" config term was used. Refer to
|
||||
the config terms section above. The power events record information about
|
||||
C-state changes, whereas CBR is indicative of CPU frequency. perf script
|
||||
"event,synth" fields display information like this:
|
||||
cbr: cbr: 22 freq: 2189 MHz (200%)
|
||||
mwait: hints: 0x60 extensions: 0x1
|
||||
pwre: hw: 0 cstate: 2 sub-cstate: 0
|
||||
exstop: ip: 1
|
||||
pwrx: deepest cstate: 2 last cstate: 2 wake reason: 0x4
|
||||
Where:
|
||||
"cbr" includes the frequency and the percentage of maximum non-turbo
|
||||
"mwait" shows mwait hints and extensions
|
||||
"pwre" shows C-state transitions (to a C-state deeper than C0) and
|
||||
whether initiated by hardware
|
||||
"exstop" indicates execution stopped and whether the IP was recorded
|
||||
exactly,
|
||||
"pwrx" indicates return to C0
|
||||
For more details refer to the Intel 64 and IA-32 Architectures Software
|
||||
Developer Manuals.
|
||||
|
||||
Error events show where the decoder lost the trace. Error events
|
||||
are quite important. Users must know if what they are seeing is a complete
|
||||
picture or not.
|
||||
|
||||
The "d" option will cause the creation of a file "intel_pt.log" containing all
|
||||
decoded packets and instructions. Note that this option slows down the decoder
|
||||
and that the resulting file may be very large.
|
||||
|
||||
In addition, the period of the "instructions" event can be specified. e.g.
|
||||
|
||||
--itrace=i10us
|
||||
|
||||
sets the period to 10us i.e. one instruction sample is synthesized for each 10
|
||||
microseconds of trace. Alternatives to "us" are "ms" (milliseconds),
|
||||
"ns" (nanoseconds), "t" (TSC ticks) or "i" (instructions).
|
||||
|
||||
"ms", "us" and "ns" are converted to TSC ticks.
|
||||
|
||||
The timing information included with Intel PT does not give the time of every
|
||||
instruction. Consequently, for the purpose of sampling, the decoder estimates
|
||||
the time since the last timing packet based on 1 tick per instruction. The time
|
||||
on the sample is *not* adjusted and reflects the last known value of TSC.
|
||||
|
||||
For Intel PT, the default period is 100us.
|
||||
|
||||
Setting it to a zero period means "as often as possible".
|
||||
|
||||
In the case of Intel PT that is the same as a period of 1 and a unit of
|
||||
'instructions' (i.e. --itrace=i1i).
|
||||
|
||||
Also the call chain size (default 16, max. 1024) for instructions or
|
||||
transactions events can be specified. e.g.
|
||||
|
||||
--itrace=ig32
|
||||
--itrace=xg32
|
||||
|
||||
Also the number of last branch entries (default 64, max. 1024) for instructions or
|
||||
transactions events can be specified. e.g.
|
||||
|
||||
--itrace=il10
|
||||
--itrace=xl10
|
||||
|
||||
Note that last branch entries are cleared for each sample, so there is no overlap
|
||||
from one sample to the next.
|
||||
|
||||
To disable trace decoding entirely, use the option --no-itrace.
|
||||
|
||||
It is also possible to skip events generated (instructions, branches, transactions)
|
||||
at the beginning. This is useful to ignore initialization code.
|
||||
|
||||
--itrace=i0nss1000000
|
||||
|
||||
skips the first million instructions.
|
||||
|
||||
dump option
|
||||
-----------
|
||||
|
||||
perf script has an option (-D) to "dump" the events i.e. display the binary
|
||||
data.
|
||||
|
||||
When -D is used, Intel PT packets are displayed. The packet decoder does not
|
||||
pay attention to PSB packets, but just decodes the bytes - so the packets seen
|
||||
by the actual decoder may not be identical in places where the data is corrupt.
|
||||
One example of that would be when the buffer-switching interrupt has been too
|
||||
slow, and the buffer has been filled completely. In that case, the last packet
|
||||
in the buffer might be truncated and immediately followed by a PSB as the trace
|
||||
continues in the next buffer.
|
||||
|
||||
To disable the display of Intel PT packets, combine the -D option with
|
||||
--no-itrace.
|
||||
|
||||
|
||||
perf report
|
||||
===========
|
||||
|
||||
By default, perf report will decode trace data found in the perf.data file.
|
||||
This can be further controlled by new option --itrace exactly the same as
|
||||
perf script, with the exception that the default is --itrace=igxe.
|
||||
|
||||
|
||||
perf inject
|
||||
===========
|
||||
|
||||
perf inject also accepts the --itrace option in which case tracing data is
|
||||
removed and replaced with the synthesized events. e.g.
|
||||
|
||||
perf inject --itrace -i perf.data -o perf.data.new
|
||||
|
||||
Below is an example of using Intel PT with autofdo. It requires autofdo
|
||||
(https://github.com/google/autofdo) and gcc version 5. The bubble
|
||||
sort example is from the AutoFDO tutorial (https://gcc.gnu.org/wiki/AutoFDO/Tutorial)
|
||||
amended to take the number of elements as a parameter.
|
||||
|
||||
$ gcc-5 -O3 sort.c -o sort_optimized
|
||||
$ ./sort_optimized 30000
|
||||
Bubble sorting array of 30000 elements
|
||||
2254 ms
|
||||
|
||||
$ cat ~/.perfconfig
|
||||
[intel-pt]
|
||||
mispred-all = on
|
||||
|
||||
$ perf record -e intel_pt//u ./sort 3000
|
||||
Bubble sorting array of 3000 elements
|
||||
58 ms
|
||||
[ perf record: Woken up 2 times to write data ]
|
||||
[ perf record: Captured and wrote 3.939 MB perf.data ]
|
||||
$ perf inject -i perf.data -o inj --itrace=i100usle --strip
|
||||
$ ./create_gcov --binary=./sort --profile=inj --gcov=sort.gcov -gcov_version=1
|
||||
$ gcc-5 -O3 -fauto-profile=sort.gcov sort.c -o sort_autofdo
|
||||
$ ./sort_autofdo 30000
|
||||
Bubble sorting array of 30000 elements
|
||||
2155 ms
|
||||
|
||||
Note there is currently no advantage to using Intel PT instead of LBR, but
|
||||
that may change in the future if greater use is made of the data.
|
||||
|
||||
|
||||
PEBS via Intel PT
|
||||
=================
|
||||
|
||||
Some hardware has the feature to redirect PEBS records to the Intel PT trace.
|
||||
Recording is selected by using the aux-output config term e.g.
|
||||
|
||||
perf record -c 10000 -e '{intel_pt/branch=0/,cycles/aux-output/ppp}' uname
|
||||
|
||||
Note that currently, software only supports redirecting at most one PEBS event.
|
||||
|
||||
To display PEBS events from the Intel PT trace, use the itrace 'o' option e.g.
|
||||
|
||||
perf script --itrace=oe
|
||||
Documentation for support for Intel Processor Trace within perf tools' has moved to file perf-intel-pt.txt
|
||||
|
||||
@ -66,4 +66,5 @@ include::itrace.txt[]
|
||||
|
||||
SEE ALSO
|
||||
--------
|
||||
linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-archive[1]
|
||||
linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-archive[1],
|
||||
linkperf:perf-intel-pt[1]
|
||||
|
||||
1007
tools/perf/Documentation/perf-intel-pt.txt
Normal file
1007
tools/perf/Documentation/perf-intel-pt.txt
Normal file
File diff suppressed because it is too large
Load Diff
@ -589,4 +589,4 @@ appended unit character - B/K/M/G
|
||||
|
||||
SEE ALSO
|
||||
--------
|
||||
linkperf:perf-stat[1], linkperf:perf-list[1]
|
||||
linkperf:perf-stat[1], linkperf:perf-list[1], linkperf:perf-intel-pt[1]
|
||||
|
||||
@ -546,4 +546,5 @@ include::callchain-overhead-calculation.txt[]
|
||||
|
||||
SEE ALSO
|
||||
--------
|
||||
linkperf:perf-stat[1], linkperf:perf-annotate[1], linkperf:perf-record[1]
|
||||
linkperf:perf-stat[1], linkperf:perf-annotate[1], linkperf:perf-record[1],
|
||||
linkperf:perf-intel-pt[1]
|
||||
|
||||
@ -429,4 +429,4 @@ include::itrace.txt[]
|
||||
SEE ALSO
|
||||
--------
|
||||
linkperf:perf-record[1], linkperf:perf-script-perl[1],
|
||||
linkperf:perf-script-python[1]
|
||||
linkperf:perf-script-python[1], linkperf:perf-intel-pt[1]
|
||||
|
||||
@ -186,24 +186,23 @@ static int hist_iter__branch_callback(struct hist_entry_iter *iter,
|
||||
{
|
||||
struct hist_entry *he = iter->he;
|
||||
struct report *rep = arg;
|
||||
struct branch_info *bi;
|
||||
struct branch_info *bi = he->branch_info;
|
||||
struct perf_sample *sample = iter->sample;
|
||||
struct evsel *evsel = iter->evsel;
|
||||
int err;
|
||||
|
||||
branch_type_count(&rep->brtype_stat, &bi->flags,
|
||||
bi->from.addr, bi->to.addr);
|
||||
|
||||
if (!ui__has_annotation() && !rep->symbol_ipc)
|
||||
return 0;
|
||||
|
||||
bi = he->branch_info;
|
||||
err = addr_map_symbol__inc_samples(&bi->from, sample, evsel);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
err = addr_map_symbol__inc_samples(&bi->to, sample, evsel);
|
||||
|
||||
branch_type_count(&rep->brtype_stat, &bi->flags,
|
||||
bi->from.addr, bi->to.addr);
|
||||
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
@ -4,27 +4,27 @@
|
||||
"EventCode": "80",
|
||||
"EventName": "ECC_FUNCTION_COUNT",
|
||||
"BriefDescription": "ECC Function Count",
|
||||
"PublicDescription": "Long ECC function Count"
|
||||
"PublicDescription": "This counter counts the total number of the elliptic-curve cryptography (ECC) functions issued by the CPU."
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
"EventCode": "81",
|
||||
"EventName": "ECC_CYCLES_COUNT",
|
||||
"BriefDescription": "ECC Cycles Count",
|
||||
"PublicDescription": "Long ECC Function cycles count"
|
||||
"PublicDescription": "This counter counts the total number of CPU cycles when the ECC coprocessor is busy performing the elliptic-curve cryptography (ECC) functions issued by the CPU."
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
"EventCode": "82",
|
||||
"EventName": "ECC_BLOCKED_FUNCTION_COUNT",
|
||||
"BriefDescription": "Ecc Blocked Function Count",
|
||||
"PublicDescription": "Long ECC blocked function count"
|
||||
"PublicDescription": "This counter counts the total number of the elliptic-curve cryptography (ECC) functions that are issued by the CPU and are blocked because the ECC coprocessor is busy performing a function issued by another CPU."
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
"EventCode": "83",
|
||||
"EventName": "ECC_BLOCKED_CYCLES_COUNT",
|
||||
"BriefDescription": "ECC Blocked Cycles Count",
|
||||
"PublicDescription": "Long ECC blocked cycles count"
|
||||
"PublicDescription": "This counter counts the total number of CPU cycles blocked for the elliptic-curve cryptography (ECC) functions issued by the CPU because the ECC coprocessor is busy performing a function issued by another CPU."
|
||||
},
|
||||
]
|
||||
|
||||
@ -25,7 +25,7 @@
|
||||
"EventCode": "131",
|
||||
"EventName": "DTLB2_HPAGE_WRITES",
|
||||
"BriefDescription": "DTLB2 One-Megabyte Page Writes",
|
||||
"PublicDescription": "A translation entry was written into the Combined Region and Segment Table Entry array in the Level-2 TLB for a one-megabyte page or a Last Host Translation was done"
|
||||
"PublicDescription": "A translation entry was written into the Combined Region and Segment Table Entry array in the Level-2 TLB for a one-megabyte page"
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
@ -356,6 +356,34 @@
|
||||
"BriefDescription": "Aborted transactions in constrained TX mode using special completion logic",
|
||||
"PublicDescription": "A transaction abort has occurred in a constrained transactional-execution mode and the CPU is using special logic to allow the transaction to complete"
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
"EventCode": "247",
|
||||
"EventName": "DFLT_ACCESS",
|
||||
"BriefDescription": "Cycles CPU spent obtaining access to Deflate unit",
|
||||
"PublicDescription": "Cycles CPU spent obtaining access to Deflate unit"
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
"EventCode": "252",
|
||||
"EventName": "DFLT_CYCLES",
|
||||
"BriefDescription": "Cycles CPU is using Deflate unit",
|
||||
"PublicDescription": "Cycles CPU is using Deflate unit"
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
"EventCode": "264",
|
||||
"EventName": "DFLT_CC",
|
||||
"BriefDescription": "Increments by one for every DEFLATE CONVERSION CALL instruction executed",
|
||||
"PublicDescription": "Increments by one for every DEFLATE CONVERSION CALL instruction executed"
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
"EventCode": "265",
|
||||
"EventName": "DFLT_CCERROR",
|
||||
"BriefDescription": "Increments by one for every DEFLATE CONVERSION CALL instruction executed that ended in Condition Codes 0, 1 or 2",
|
||||
"PublicDescription": "Increments by one for every DEFLATE CONVERSION CALL instruction executed that ended in Condition Codes 0, 1 or 2"
|
||||
},
|
||||
{
|
||||
"Unit": "CPU-M-CF",
|
||||
"EventCode": "448",
|
||||
|
||||
@ -215,7 +215,8 @@
|
||||
"BriefDescription": "Utilization of the core's Page Walker(s) serving STLB misses triggered by instruction/Load/Store accesses",
|
||||
"MetricExpr": "( ITLB_MISSES.WALK_PENDING + DTLB_LOAD_MISSES.WALK_PENDING + DTLB_STORE_MISSES.WALK_PENDING + EPT.WALK_PENDING ) / ( 2 * cycles )",
|
||||
"MetricGroup": "TLB",
|
||||
"MetricName": "Page_Walks_Utilization"
|
||||
"MetricName": "Page_Walks_Utilization",
|
||||
"MetricConstraint": "NO_NMI_WATCHDOG"
|
||||
},
|
||||
{
|
||||
"BriefDescription": "Utilization of the core's Page Walker(s) serving STLB misses triggered by instruction/Load/Store accesses",
|
||||
|
||||
@ -215,7 +215,8 @@
|
||||
"BriefDescription": "Utilization of the core's Page Walker(s) serving STLB misses triggered by instruction/Load/Store accesses",
|
||||
"MetricExpr": "( ITLB_MISSES.WALK_PENDING + DTLB_LOAD_MISSES.WALK_PENDING + DTLB_STORE_MISSES.WALK_PENDING + EPT.WALK_PENDING ) / ( 2 * cycles )",
|
||||
"MetricGroup": "TLB",
|
||||
"MetricName": "Page_Walks_Utilization"
|
||||
"MetricName": "Page_Walks_Utilization",
|
||||
"MetricConstraint": "NO_NMI_WATCHDOG"
|
||||
},
|
||||
{
|
||||
"BriefDescription": "Utilization of the core's Page Walker(s) serving STLB misses triggered by instruction/Load/Store accesses",
|
||||
|
||||
@ -215,7 +215,8 @@
|
||||
"BriefDescription": "Utilization of the core's Page Walker(s) serving STLB misses triggered by instruction/Load/Store accesses",
|
||||
"MetricExpr": "( ITLB_MISSES.WALK_PENDING + DTLB_LOAD_MISSES.WALK_PENDING + DTLB_STORE_MISSES.WALK_PENDING + EPT.WALK_PENDING ) / ( 2 * cycles )",
|
||||
"MetricGroup": "TLB",
|
||||
"MetricName": "Page_Walks_Utilization"
|
||||
"MetricName": "Page_Walks_Utilization",
|
||||
"MetricConstraint": "NO_NMI_WATCHDOG"
|
||||
},
|
||||
{
|
||||
"BriefDescription": "Utilization of the core's Page Walker(s) serving STLB misses triggered by instruction/Load/Store accesses",
|
||||
|
||||
@ -323,7 +323,7 @@ static int print_events_table_entry(void *data, char *name, char *event,
|
||||
char *pmu, char *unit, char *perpkg,
|
||||
char *metric_expr,
|
||||
char *metric_name, char *metric_group,
|
||||
char *deprecated)
|
||||
char *deprecated, char *metric_constraint)
|
||||
{
|
||||
struct perf_entry_data *pd = data;
|
||||
FILE *outfp = pd->outfp;
|
||||
@ -357,6 +357,8 @@ static int print_events_table_entry(void *data, char *name, char *event,
|
||||
fprintf(outfp, "\t.metric_group = \"%s\",\n", metric_group);
|
||||
if (deprecated)
|
||||
fprintf(outfp, "\t.deprecated = \"%s\",\n", deprecated);
|
||||
if (metric_constraint)
|
||||
fprintf(outfp, "\t.metric_constraint = \"%s\",\n", metric_constraint);
|
||||
fprintf(outfp, "},\n");
|
||||
|
||||
return 0;
|
||||
@ -375,6 +377,7 @@ struct event_struct {
|
||||
char *metric_name;
|
||||
char *metric_group;
|
||||
char *deprecated;
|
||||
char *metric_constraint;
|
||||
};
|
||||
|
||||
#define ADD_EVENT_FIELD(field) do { if (field) { \
|
||||
@ -422,7 +425,7 @@ static int save_arch_std_events(void *data, char *name, char *event,
|
||||
char *desc, char *long_desc, char *pmu,
|
||||
char *unit, char *perpkg, char *metric_expr,
|
||||
char *metric_name, char *metric_group,
|
||||
char *deprecated)
|
||||
char *deprecated, char *metric_constraint)
|
||||
{
|
||||
struct event_struct *es;
|
||||
|
||||
@ -486,7 +489,7 @@ try_fixup(const char *fn, char *arch_std, char **event, char **desc,
|
||||
char **name, char **long_desc, char **pmu, char **filter,
|
||||
char **perpkg, char **unit, char **metric_expr, char **metric_name,
|
||||
char **metric_group, unsigned long long eventcode,
|
||||
char **deprecated)
|
||||
char **deprecated, char **metric_constraint)
|
||||
{
|
||||
/* try to find matching event from arch standard values */
|
||||
struct event_struct *es;
|
||||
@ -515,7 +518,7 @@ int json_events(const char *fn,
|
||||
char *pmu, char *unit, char *perpkg,
|
||||
char *metric_expr,
|
||||
char *metric_name, char *metric_group,
|
||||
char *deprecated),
|
||||
char *deprecated, char *metric_constraint),
|
||||
void *data)
|
||||
{
|
||||
int err;
|
||||
@ -545,6 +548,7 @@ int json_events(const char *fn,
|
||||
char *metric_name = NULL;
|
||||
char *metric_group = NULL;
|
||||
char *deprecated = NULL;
|
||||
char *metric_constraint = NULL;
|
||||
char *arch_std = NULL;
|
||||
unsigned long long eventcode = 0;
|
||||
struct msrmap *msr = NULL;
|
||||
@ -629,6 +633,8 @@ int json_events(const char *fn,
|
||||
addfield(map, &metric_name, "", "", val);
|
||||
} else if (json_streq(map, field, "MetricGroup")) {
|
||||
addfield(map, &metric_group, "", "", val);
|
||||
} else if (json_streq(map, field, "MetricConstraint")) {
|
||||
addfield(map, &metric_constraint, "", "", val);
|
||||
} else if (json_streq(map, field, "MetricExpr")) {
|
||||
addfield(map, &metric_expr, "", "", val);
|
||||
for (s = metric_expr; *s; s++)
|
||||
@ -670,13 +676,13 @@ int json_events(const char *fn,
|
||||
&long_desc, &pmu, &filter, &perpkg,
|
||||
&unit, &metric_expr, &metric_name,
|
||||
&metric_group, eventcode,
|
||||
&deprecated);
|
||||
&deprecated, &metric_constraint);
|
||||
if (err)
|
||||
goto free_strings;
|
||||
}
|
||||
err = func(data, name, real_event(name, event), desc, long_desc,
|
||||
pmu, unit, perpkg, metric_expr, metric_name,
|
||||
metric_group, deprecated);
|
||||
metric_group, deprecated, metric_constraint);
|
||||
free_strings:
|
||||
free(event);
|
||||
free(desc);
|
||||
@ -691,6 +697,7 @@ free_strings:
|
||||
free(metric_expr);
|
||||
free(metric_name);
|
||||
free(metric_group);
|
||||
free(metric_constraint);
|
||||
free(arch_std);
|
||||
|
||||
if (err)
|
||||
|
||||
@ -8,7 +8,7 @@ int json_events(const char *fn,
|
||||
char *pmu,
|
||||
char *unit, char *perpkg, char *metric_expr,
|
||||
char *metric_name, char *metric_group,
|
||||
char *deprecated),
|
||||
char *deprecated, char *metric_constraint),
|
||||
void *data);
|
||||
char *get_cpu_str(void);
|
||||
|
||||
|
||||
@ -18,6 +18,7 @@ struct pmu_event {
|
||||
const char *metric_name;
|
||||
const char *metric_group;
|
||||
const char *deprecated;
|
||||
const char *metric_constraint;
|
||||
};
|
||||
|
||||
/*
|
||||
|
||||
@ -28,7 +28,7 @@ sub trace_end
|
||||
sub irq::softirq_entry
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$vec) = @_;
|
||||
|
||||
print_header($event_name, $common_cpu, $common_secs, $common_nsecs,
|
||||
@ -43,7 +43,7 @@ sub irq::softirq_entry
|
||||
sub kmem::kmalloc
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$call_site, $ptr, $bytes_req, $bytes_alloc,
|
||||
$gfp_flags) = @_;
|
||||
|
||||
@ -92,7 +92,7 @@ sub print_unhandled
|
||||
sub trace_unhandled
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm) = @_;
|
||||
$common_pid, $common_comm, $common_callchain) = @_;
|
||||
|
||||
$unhandled{$event_name}++;
|
||||
}
|
||||
|
||||
@ -18,7 +18,7 @@ my %failed_syscalls;
|
||||
sub raw_syscalls::sys_exit
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$id, $ret) = @_;
|
||||
|
||||
if ($ret < 0) {
|
||||
|
||||
@ -28,7 +28,7 @@ my %writes;
|
||||
sub syscalls::sys_enter_read
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm, $nr, $fd, $buf, $count) = @_;
|
||||
$common_pid, $common_comm, $common_callchain, $nr, $fd, $buf, $count) = @_;
|
||||
|
||||
if ($common_comm eq $for_comm) {
|
||||
$reads{$fd}{bytes_requested} += $count;
|
||||
@ -39,7 +39,7 @@ sub syscalls::sys_enter_read
|
||||
sub syscalls::sys_enter_write
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm, $nr, $fd, $buf, $count) = @_;
|
||||
$common_pid, $common_comm, $common_callchain, $nr, $fd, $buf, $count) = @_;
|
||||
|
||||
if ($common_comm eq $for_comm) {
|
||||
$writes{$fd}{bytes_written} += $count;
|
||||
@ -98,7 +98,7 @@ sub print_unhandled
|
||||
sub trace_unhandled
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm) = @_;
|
||||
$common_pid, $common_comm, $common_callchain) = @_;
|
||||
|
||||
$unhandled{$event_name}++;
|
||||
}
|
||||
|
||||
@ -24,7 +24,7 @@ my %writes;
|
||||
sub syscalls::sys_exit_read
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$nr, $ret) = @_;
|
||||
|
||||
if ($ret > 0) {
|
||||
@ -40,7 +40,7 @@ sub syscalls::sys_exit_read
|
||||
sub syscalls::sys_enter_read
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$nr, $fd, $buf, $count) = @_;
|
||||
|
||||
$reads{$common_pid}{bytes_requested} += $count;
|
||||
@ -51,7 +51,7 @@ sub syscalls::sys_enter_read
|
||||
sub syscalls::sys_exit_write
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$nr, $ret) = @_;
|
||||
|
||||
if ($ret <= 0) {
|
||||
@ -62,7 +62,7 @@ sub syscalls::sys_exit_write
|
||||
sub syscalls::sys_enter_write
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$nr, $fd, $buf, $count) = @_;
|
||||
|
||||
$writes{$common_pid}{bytes_written} += $count;
|
||||
@ -178,7 +178,7 @@ sub print_unhandled
|
||||
sub trace_unhandled
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm) = @_;
|
||||
$common_pid, $common_comm, $common_callchain) = @_;
|
||||
|
||||
$unhandled{$event_name}++;
|
||||
}
|
||||
|
||||
@ -35,7 +35,7 @@ if (!$interval) {
|
||||
sub syscalls::sys_exit_read
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$nr, $ret) = @_;
|
||||
|
||||
print_check();
|
||||
@ -53,7 +53,7 @@ sub syscalls::sys_exit_read
|
||||
sub syscalls::sys_enter_read
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$nr, $fd, $buf, $count) = @_;
|
||||
|
||||
print_check();
|
||||
@ -66,7 +66,7 @@ sub syscalls::sys_enter_read
|
||||
sub syscalls::sys_exit_write
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$nr, $ret) = @_;
|
||||
|
||||
print_check();
|
||||
@ -79,7 +79,7 @@ sub syscalls::sys_exit_write
|
||||
sub syscalls::sys_enter_write
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$nr, $fd, $buf, $count) = @_;
|
||||
|
||||
print_check();
|
||||
@ -197,7 +197,7 @@ sub print_unhandled
|
||||
sub trace_unhandled
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm) = @_;
|
||||
$common_pid, $common_comm, $common_callchain) = @_;
|
||||
|
||||
$unhandled{$event_name}++;
|
||||
}
|
||||
|
||||
@ -28,7 +28,7 @@ my $total_wakeups = 0;
|
||||
sub sched::sched_switch
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$prev_comm, $prev_pid, $prev_prio, $prev_state, $next_comm, $next_pid,
|
||||
$next_prio) = @_;
|
||||
|
||||
@ -51,7 +51,7 @@ sub sched::sched_switch
|
||||
sub sched::sched_wakeup
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm,
|
||||
$common_pid, $common_comm, $common_callchain,
|
||||
$comm, $pid, $prio, $success, $target_cpu) = @_;
|
||||
|
||||
$last_wakeup{$target_cpu}{ts} = nsecs($common_secs, $common_nsecs);
|
||||
@ -101,7 +101,7 @@ sub print_unhandled
|
||||
sub trace_unhandled
|
||||
{
|
||||
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
||||
$common_pid, $common_comm) = @_;
|
||||
$common_pid, $common_comm, $common_callchain) = @_;
|
||||
|
||||
$unhandled{$event_name}++;
|
||||
}
|
||||
|
||||
@ -543,8 +543,11 @@ static int run_shell_tests(int argc, const char *argv[], int i, int width)
|
||||
return -1;
|
||||
|
||||
dir = opendir(st.dir);
|
||||
if (!dir)
|
||||
if (!dir) {
|
||||
pr_err("failed to open shell test directory: %s\n",
|
||||
st.dir);
|
||||
return -1;
|
||||
}
|
||||
|
||||
for_each_shell_test(dir, st.dir, ent) {
|
||||
int curr = i++;
|
||||
|
||||
@ -363,6 +363,23 @@ struct cs_etm_packet_queue
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void cs_etm__packet_swap(struct cs_etm_auxtrace *etm,
|
||||
struct cs_etm_traceid_queue *tidq)
|
||||
{
|
||||
struct cs_etm_packet *tmp;
|
||||
|
||||
if (etm->sample_branches || etm->synth_opts.last_branch ||
|
||||
etm->sample_instructions) {
|
||||
/*
|
||||
* Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for
|
||||
* the next incoming packet.
|
||||
*/
|
||||
tmp = tidq->packet;
|
||||
tidq->packet = tidq->prev_packet;
|
||||
tidq->prev_packet = tmp;
|
||||
}
|
||||
}
|
||||
|
||||
static void cs_etm__packet_dump(const char *pkt_string)
|
||||
{
|
||||
const char *color = PERF_COLOR_BLUE;
|
||||
@ -945,7 +962,7 @@ static inline u64 cs_etm__instr_addr(struct cs_etm_queue *etmq,
|
||||
if (packet->isa == CS_ETM_ISA_T32) {
|
||||
u64 addr = packet->start_addr;
|
||||
|
||||
while (offset > 0) {
|
||||
while (offset) {
|
||||
addr += cs_etm__t32_instr_size(etmq,
|
||||
trace_chan_id, addr);
|
||||
offset--;
|
||||
@ -1134,10 +1151,8 @@ static int cs_etm__synth_instruction_sample(struct cs_etm_queue *etmq,
|
||||
|
||||
cs_etm__copy_insn(etmq, tidq->trace_chan_id, tidq->packet, &sample);
|
||||
|
||||
if (etm->synth_opts.last_branch) {
|
||||
cs_etm__copy_last_branch_rb(etmq, tidq);
|
||||
if (etm->synth_opts.last_branch)
|
||||
sample.branch_stack = tidq->last_branch;
|
||||
}
|
||||
|
||||
if (etm->synth_opts.inject) {
|
||||
ret = cs_etm__inject_event(event, &sample,
|
||||
@ -1153,9 +1168,6 @@ static int cs_etm__synth_instruction_sample(struct cs_etm_queue *etmq,
|
||||
"CS ETM Trace: failed to deliver instruction event, error %d\n",
|
||||
ret);
|
||||
|
||||
if (etm->synth_opts.last_branch)
|
||||
cs_etm__reset_last_branch_rb(tidq);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
@ -1342,12 +1354,14 @@ static int cs_etm__sample(struct cs_etm_queue *etmq,
|
||||
struct cs_etm_traceid_queue *tidq)
|
||||
{
|
||||
struct cs_etm_auxtrace *etm = etmq->etm;
|
||||
struct cs_etm_packet *tmp;
|
||||
int ret;
|
||||
u8 trace_chan_id = tidq->trace_chan_id;
|
||||
u64 instrs_executed = tidq->packet->instr_count;
|
||||
u64 instrs_prev;
|
||||
|
||||
tidq->period_instructions += instrs_executed;
|
||||
/* Get instructions remainder from previous packet */
|
||||
instrs_prev = tidq->period_instructions;
|
||||
|
||||
tidq->period_instructions += tidq->packet->instr_count;
|
||||
|
||||
/*
|
||||
* Record a branch when the last instruction in
|
||||
@ -1365,26 +1379,80 @@ static int cs_etm__sample(struct cs_etm_queue *etmq,
|
||||
* TODO: allow period to be defined in cycles and clock time
|
||||
*/
|
||||
|
||||
/* Get number of instructions executed after the sample point */
|
||||
u64 instrs_over = tidq->period_instructions -
|
||||
etm->instructions_sample_period;
|
||||
/*
|
||||
* Below diagram demonstrates the instruction samples
|
||||
* generation flows:
|
||||
*
|
||||
* Instrs Instrs Instrs Instrs
|
||||
* Sample(n) Sample(n+1) Sample(n+2) Sample(n+3)
|
||||
* | | | |
|
||||
* V V V V
|
||||
* --------------------------------------------------
|
||||
* ^ ^
|
||||
* | |
|
||||
* Period Period
|
||||
* instructions(Pi) instructions(Pi')
|
||||
*
|
||||
* | |
|
||||
* \---------------- -----------------/
|
||||
* V
|
||||
* tidq->packet->instr_count
|
||||
*
|
||||
* Instrs Sample(n...) are the synthesised samples occurring
|
||||
* every etm->instructions_sample_period instructions - as
|
||||
* defined on the perf command line. Sample(n) is being the
|
||||
* last sample before the current etm packet, n+1 to n+3
|
||||
* samples are generated from the current etm packet.
|
||||
*
|
||||
* tidq->packet->instr_count represents the number of
|
||||
* instructions in the current etm packet.
|
||||
*
|
||||
* Period instructions (Pi) contains the the number of
|
||||
* instructions executed after the sample point(n) from the
|
||||
* previous etm packet. This will always be less than
|
||||
* etm->instructions_sample_period.
|
||||
*
|
||||
* When generate new samples, it combines with two parts
|
||||
* instructions, one is the tail of the old packet and another
|
||||
* is the head of the new coming packet, to generate
|
||||
* sample(n+1); sample(n+2) and sample(n+3) consume the
|
||||
* instructions with sample period. After sample(n+3), the rest
|
||||
* instructions will be used by later packet and it is assigned
|
||||
* to tidq->period_instructions for next round calculation.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Calculate the address of the sampled instruction (-1 as
|
||||
* sample is reported as though instruction has just been
|
||||
* executed, but PC has not advanced to next instruction)
|
||||
* Get the initial offset into the current packet instructions;
|
||||
* entry conditions ensure that instrs_prev is less than
|
||||
* etm->instructions_sample_period.
|
||||
*/
|
||||
u64 offset = (instrs_executed - instrs_over - 1);
|
||||
u64 addr = cs_etm__instr_addr(etmq, trace_chan_id,
|
||||
tidq->packet, offset);
|
||||
u64 offset = etm->instructions_sample_period - instrs_prev;
|
||||
u64 addr;
|
||||
|
||||
ret = cs_etm__synth_instruction_sample(
|
||||
etmq, tidq, addr, etm->instructions_sample_period);
|
||||
if (ret)
|
||||
return ret;
|
||||
/* Prepare last branches for instruction sample */
|
||||
if (etm->synth_opts.last_branch)
|
||||
cs_etm__copy_last_branch_rb(etmq, tidq);
|
||||
|
||||
/* Carry remaining instructions into next sample period */
|
||||
tidq->period_instructions = instrs_over;
|
||||
while (tidq->period_instructions >=
|
||||
etm->instructions_sample_period) {
|
||||
/*
|
||||
* Calculate the address of the sampled instruction (-1
|
||||
* as sample is reported as though instruction has just
|
||||
* been executed, but PC has not advanced to next
|
||||
* instruction)
|
||||
*/
|
||||
addr = cs_etm__instr_addr(etmq, trace_chan_id,
|
||||
tidq->packet, offset - 1);
|
||||
ret = cs_etm__synth_instruction_sample(
|
||||
etmq, tidq, addr,
|
||||
etm->instructions_sample_period);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
offset += etm->instructions_sample_period;
|
||||
tidq->period_instructions -=
|
||||
etm->instructions_sample_period;
|
||||
}
|
||||
}
|
||||
|
||||
if (etm->sample_branches) {
|
||||
@ -1406,15 +1474,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq,
|
||||
}
|
||||
}
|
||||
|
||||
if (etm->sample_branches || etm->synth_opts.last_branch) {
|
||||
/*
|
||||
* Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for
|
||||
* the next incoming packet.
|
||||
*/
|
||||
tmp = tidq->packet;
|
||||
tidq->packet = tidq->prev_packet;
|
||||
tidq->prev_packet = tmp;
|
||||
}
|
||||
cs_etm__packet_swap(etm, tidq);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -1443,7 +1503,6 @@ static int cs_etm__flush(struct cs_etm_queue *etmq,
|
||||
{
|
||||
int err = 0;
|
||||
struct cs_etm_auxtrace *etm = etmq->etm;
|
||||
struct cs_etm_packet *tmp;
|
||||
|
||||
/* Handle start tracing packet */
|
||||
if (tidq->prev_packet->sample_type == CS_ETM_EMPTY)
|
||||
@ -1451,6 +1510,11 @@ static int cs_etm__flush(struct cs_etm_queue *etmq,
|
||||
|
||||
if (etmq->etm->synth_opts.last_branch &&
|
||||
tidq->prev_packet->sample_type == CS_ETM_RANGE) {
|
||||
u64 addr;
|
||||
|
||||
/* Prepare last branches for instruction sample */
|
||||
cs_etm__copy_last_branch_rb(etmq, tidq);
|
||||
|
||||
/*
|
||||
* Generate a last branch event for the branches left in the
|
||||
* circular buffer at the end of the trace.
|
||||
@ -1458,7 +1522,7 @@ static int cs_etm__flush(struct cs_etm_queue *etmq,
|
||||
* Use the address of the end of the last reported execution
|
||||
* range
|
||||
*/
|
||||
u64 addr = cs_etm__last_executed_instr(tidq->prev_packet);
|
||||
addr = cs_etm__last_executed_instr(tidq->prev_packet);
|
||||
|
||||
err = cs_etm__synth_instruction_sample(
|
||||
etmq, tidq, addr,
|
||||
@ -1478,15 +1542,11 @@ static int cs_etm__flush(struct cs_etm_queue *etmq,
|
||||
}
|
||||
|
||||
swap_packet:
|
||||
if (etm->sample_branches || etm->synth_opts.last_branch) {
|
||||
/*
|
||||
* Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for
|
||||
* the next incoming packet.
|
||||
*/
|
||||
tmp = tidq->packet;
|
||||
tidq->packet = tidq->prev_packet;
|
||||
tidq->prev_packet = tmp;
|
||||
}
|
||||
cs_etm__packet_swap(etm, tidq);
|
||||
|
||||
/* Reset last branches after flush the trace */
|
||||
if (etm->synth_opts.last_branch)
|
||||
cs_etm__reset_last_branch_rb(tidq);
|
||||
|
||||
return err;
|
||||
}
|
||||
@ -1507,11 +1567,16 @@ static int cs_etm__end_block(struct cs_etm_queue *etmq,
|
||||
*/
|
||||
if (etmq->etm->synth_opts.last_branch &&
|
||||
tidq->prev_packet->sample_type == CS_ETM_RANGE) {
|
||||
u64 addr;
|
||||
|
||||
/* Prepare last branches for instruction sample */
|
||||
cs_etm__copy_last_branch_rb(etmq, tidq);
|
||||
|
||||
/*
|
||||
* Use the address of the end of the last reported execution
|
||||
* range.
|
||||
*/
|
||||
u64 addr = cs_etm__last_executed_instr(tidq->prev_packet);
|
||||
addr = cs_etm__last_executed_instr(tidq->prev_packet);
|
||||
|
||||
err = cs_etm__synth_instruction_sample(
|
||||
etmq, tidq, addr,
|
||||
|
||||
@ -79,10 +79,10 @@ symbol {spec}*{sym}*{spec}*{sym}*
|
||||
{
|
||||
int start_token;
|
||||
|
||||
start_token = parse_events_get_extra(yyscanner);
|
||||
start_token = expr_get_extra(yyscanner);
|
||||
|
||||
if (start_token) {
|
||||
parse_events_set_extra(NULL, yyscanner);
|
||||
expr_set_extra(NULL, yyscanner);
|
||||
return start_token;
|
||||
}
|
||||
}
|
||||
|
||||
@ -44,8 +44,8 @@ static inline int is_no_dso_memory(const char *filename)
|
||||
|
||||
static inline int is_android_lib(const char *filename)
|
||||
{
|
||||
return !strncmp(filename, "/data/app-lib", 13) ||
|
||||
!strncmp(filename, "/system/lib", 11);
|
||||
return strstarts(filename, "/data/app-lib/") ||
|
||||
strstarts(filename, "/system/lib/");
|
||||
}
|
||||
|
||||
static inline bool replace_android_lib(const char *filename, char *newfilename)
|
||||
@ -65,7 +65,7 @@ static inline bool replace_android_lib(const char *filename, char *newfilename)
|
||||
|
||||
app_abi_length = strlen(app_abi);
|
||||
|
||||
if (!strncmp(filename, "/data/app-lib", 13)) {
|
||||
if (strstarts(filename, "/data/app-lib/")) {
|
||||
char *apk_path;
|
||||
|
||||
if (!app_abi_length)
|
||||
@ -89,7 +89,7 @@ static inline bool replace_android_lib(const char *filename, char *newfilename)
|
||||
return true;
|
||||
}
|
||||
|
||||
if (!strncmp(filename, "/system/lib/", 12)) {
|
||||
if (strstarts(filename, "/system/lib/")) {
|
||||
char *ndk, *app;
|
||||
const char *arch;
|
||||
size_t ndk_length;
|
||||
|
||||
@ -22,6 +22,8 @@
|
||||
#include <linux/string.h>
|
||||
#include <linux/zalloc.h>
|
||||
#include <subcmd/parse-options.h>
|
||||
#include <api/fs/fs.h>
|
||||
#include "util.h"
|
||||
|
||||
struct metric_event *metricgroup__lookup(struct rblist *metric_events,
|
||||
struct evsel *evsel,
|
||||
@ -399,13 +401,85 @@ void metricgroup__print(bool metrics, bool metricgroups, char *filter,
|
||||
strlist__delete(metriclist);
|
||||
}
|
||||
|
||||
static void metricgroup__add_metric_weak_group(struct strbuf *events,
|
||||
const char **ids,
|
||||
int idnum)
|
||||
{
|
||||
bool no_group = false;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < idnum; i++) {
|
||||
pr_debug("found event %s\n", ids[i]);
|
||||
/*
|
||||
* Duration time maps to a software event and can make
|
||||
* groups not count. Always use it outside a
|
||||
* group.
|
||||
*/
|
||||
if (!strcmp(ids[i], "duration_time")) {
|
||||
if (i > 0)
|
||||
strbuf_addf(events, "}:W,");
|
||||
strbuf_addf(events, "duration_time");
|
||||
no_group = true;
|
||||
continue;
|
||||
}
|
||||
strbuf_addf(events, "%s%s",
|
||||
i == 0 || no_group ? "{" : ",",
|
||||
ids[i]);
|
||||
no_group = false;
|
||||
}
|
||||
if (!no_group)
|
||||
strbuf_addf(events, "}:W");
|
||||
}
|
||||
|
||||
static void metricgroup__add_metric_non_group(struct strbuf *events,
|
||||
const char **ids,
|
||||
int idnum)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < idnum; i++)
|
||||
strbuf_addf(events, ",%s", ids[i]);
|
||||
}
|
||||
|
||||
static void metricgroup___watchdog_constraint_hint(const char *name, bool foot)
|
||||
{
|
||||
static bool violate_nmi_constraint;
|
||||
|
||||
if (!foot) {
|
||||
pr_warning("Splitting metric group %s into standalone metrics.\n", name);
|
||||
violate_nmi_constraint = true;
|
||||
return;
|
||||
}
|
||||
|
||||
if (!violate_nmi_constraint)
|
||||
return;
|
||||
|
||||
pr_warning("Try disabling the NMI watchdog to comply NO_NMI_WATCHDOG metric constraint:\n"
|
||||
" echo 0 > /proc/sys/kernel/nmi_watchdog\n"
|
||||
" perf stat ...\n"
|
||||
" echo 1 > /proc/sys/kernel/nmi_watchdog\n");
|
||||
}
|
||||
|
||||
static bool metricgroup__has_constraint(struct pmu_event *pe)
|
||||
{
|
||||
if (!pe->metric_constraint)
|
||||
return false;
|
||||
|
||||
if (!strcmp(pe->metric_constraint, "NO_NMI_WATCHDOG") &&
|
||||
sysctl__nmi_watchdog_enabled()) {
|
||||
metricgroup___watchdog_constraint_hint(pe->metric_name, false);
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static int metricgroup__add_metric(const char *metric, struct strbuf *events,
|
||||
struct list_head *group_list)
|
||||
{
|
||||
struct pmu_events_map *map = perf_pmu__find_map(NULL);
|
||||
struct pmu_event *pe;
|
||||
int ret = -EINVAL;
|
||||
int i, j;
|
||||
int i, ret = -EINVAL;
|
||||
|
||||
if (!map)
|
||||
return 0;
|
||||
@ -422,7 +496,6 @@ static int metricgroup__add_metric(const char *metric, struct strbuf *events,
|
||||
const char **ids;
|
||||
int idnum;
|
||||
struct egroup *eg;
|
||||
bool no_group = false;
|
||||
|
||||
pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
|
||||
|
||||
@ -431,27 +504,11 @@ static int metricgroup__add_metric(const char *metric, struct strbuf *events,
|
||||
continue;
|
||||
if (events->len > 0)
|
||||
strbuf_addf(events, ",");
|
||||
for (j = 0; j < idnum; j++) {
|
||||
pr_debug("found event %s\n", ids[j]);
|
||||
/*
|
||||
* Duration time maps to a software event and can make
|
||||
* groups not count. Always use it outside a
|
||||
* group.
|
||||
*/
|
||||
if (!strcmp(ids[j], "duration_time")) {
|
||||
if (j > 0)
|
||||
strbuf_addf(events, "}:W,");
|
||||
strbuf_addf(events, "duration_time");
|
||||
no_group = true;
|
||||
continue;
|
||||
}
|
||||
strbuf_addf(events, "%s%s",
|
||||
j == 0 || no_group ? "{" : ",",
|
||||
ids[j]);
|
||||
no_group = false;
|
||||
}
|
||||
if (!no_group)
|
||||
strbuf_addf(events, "}:W");
|
||||
|
||||
if (metricgroup__has_constraint(pe))
|
||||
metricgroup__add_metric_non_group(events, ids, idnum);
|
||||
else
|
||||
metricgroup__add_metric_weak_group(events, ids, idnum);
|
||||
|
||||
eg = malloc(sizeof(struct egroup));
|
||||
if (!eg) {
|
||||
@ -493,6 +550,10 @@ static int metricgroup__add_metric_list(const char *list, struct strbuf *events,
|
||||
}
|
||||
}
|
||||
free(nlist);
|
||||
|
||||
if (!ret)
|
||||
metricgroup___watchdog_constraint_hint(NULL, true);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
@ -98,20 +98,29 @@ static int perf_mmap__aio_bind(struct mmap *map, int idx, int cpu, int affinity)
|
||||
{
|
||||
void *data;
|
||||
size_t mmap_len;
|
||||
unsigned long node_mask;
|
||||
unsigned long *node_mask;
|
||||
unsigned long node_index;
|
||||
int err = 0;
|
||||
|
||||
if (affinity != PERF_AFFINITY_SYS && cpu__max_node() > 1) {
|
||||
data = map->aio.data[idx];
|
||||
mmap_len = mmap__mmap_len(map);
|
||||
node_mask = 1UL << cpu__get_node(cpu);
|
||||
if (mbind(data, mmap_len, MPOL_BIND, &node_mask, 1, 0)) {
|
||||
pr_err("Failed to bind [%p-%p] AIO buffer to node %d: error %m\n",
|
||||
data, data + mmap_len, cpu__get_node(cpu));
|
||||
node_index = cpu__get_node(cpu);
|
||||
node_mask = bitmap_alloc(node_index + 1);
|
||||
if (!node_mask) {
|
||||
pr_err("Failed to allocate node mask for mbind: error %m\n");
|
||||
return -1;
|
||||
}
|
||||
set_bit(node_index, node_mask);
|
||||
if (mbind(data, mmap_len, MPOL_BIND, node_mask, node_index + 1 + 1, 0)) {
|
||||
pr_err("Failed to bind [%p-%p] AIO buffer to node %lu: error %m\n",
|
||||
data, data + mmap_len, node_index);
|
||||
err = -1;
|
||||
}
|
||||
bitmap_free(node_mask);
|
||||
}
|
||||
|
||||
return 0;
|
||||
return err;
|
||||
}
|
||||
#else /* !HAVE_LIBNUMA_SUPPORT */
|
||||
static int perf_mmap__aio_alloc(struct mmap *map, int idx)
|
||||
|
||||
@ -16,6 +16,7 @@
|
||||
#include <linux/ctype.h>
|
||||
#include "cgroup.h"
|
||||
#include <api/fs/fs.h>
|
||||
#include "util.h"
|
||||
|
||||
#define CNTR_NOT_SUPPORTED "<not supported>"
|
||||
#define CNTR_NOT_COUNTED "<not counted>"
|
||||
@ -1097,7 +1098,6 @@ static void print_footer(struct perf_stat_config *config)
|
||||
{
|
||||
double avg = avg_stats(config->walltime_nsecs_stats) / NSEC_PER_SEC;
|
||||
FILE *output = config->output;
|
||||
int n;
|
||||
|
||||
if (!config->null_run)
|
||||
fprintf(output, "\n");
|
||||
@ -1131,9 +1131,7 @@ static void print_footer(struct perf_stat_config *config)
|
||||
}
|
||||
fprintf(output, "\n\n");
|
||||
|
||||
if (config->print_free_counters_hint &&
|
||||
sysctl__read_int("kernel/nmi_watchdog", &n) >= 0 &&
|
||||
n > 0)
|
||||
if (config->print_free_counters_hint && sysctl__nmi_watchdog_enabled())
|
||||
fprintf(output,
|
||||
"Some events weren't counted. Try disabling the NMI watchdog:\n"
|
||||
" echo 0 > /proc/sys/kernel/nmi_watchdog\n"
|
||||
|
||||
@ -345,6 +345,7 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
|
||||
continue;
|
||||
|
||||
event->mmap2.ino = (u64)ino;
|
||||
event->mmap2.ino_generation = 0;
|
||||
|
||||
/*
|
||||
* Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
|
||||
|
||||
@ -55,6 +55,24 @@ int sysctl__max_stack(void)
|
||||
return sysctl_perf_event_max_stack;
|
||||
}
|
||||
|
||||
bool sysctl__nmi_watchdog_enabled(void)
|
||||
{
|
||||
static bool cached;
|
||||
static bool nmi_watchdog;
|
||||
int value;
|
||||
|
||||
if (cached)
|
||||
return nmi_watchdog;
|
||||
|
||||
if (sysctl__read_int("kernel/nmi_watchdog", &value) < 0)
|
||||
return false;
|
||||
|
||||
nmi_watchdog = (value > 0) ? true : false;
|
||||
cached = true;
|
||||
|
||||
return nmi_watchdog;
|
||||
}
|
||||
|
||||
bool test_attr__enabled;
|
||||
|
||||
bool perf_host = true;
|
||||
|
||||
@ -29,6 +29,8 @@ size_t hex_width(u64 v);
|
||||
|
||||
int sysctl__max_stack(void);
|
||||
|
||||
bool sysctl__nmi_watchdog_enabled(void);
|
||||
|
||||
int fetch_kernel_version(unsigned int *puint,
|
||||
char *str, size_t str_sz);
|
||||
#define KVER_VERSION(x) (((x) >> 16) & 0xff)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user