mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
409a8be615
Using addr2line for now, requires debuginfo, needs more work to support detached debuginfo, aka foo-debuginfo packages. Example: [root@sandy ~]# perf record -a sleep 3 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.555 MB perf.data (~24236 samples) ] [root@sandy ~]# perf report -s dso,srcline 2>&1 | grep -v ^# | head -5 22.41% [kernel.kallsyms] /home/git/linux/drivers/idle/intel_idle.c:280 4.79% [kernel.kallsyms] /home/git/linux/drivers/cpuidle/cpuidle.c:148 4.78% [kernel.kallsyms] /home/git/linux/arch/x86/include/asm/atomic64_64.h:121 4.49% [kernel.kallsyms] /home/git/linux/kernel/sched/core.c:1690 4.30% [kernel.kallsyms] /home/git/linux/include/linux/seqlock.h:90 [root@sandy ~]# [root@sandy ~]# perf top -U -s dso,symbol,srcline Samples: 1K of event 'cycles', Event count (approx.): 589617389 18.66% [kernel] [k] copy_user_generic_unrolled /home/git/linux/arch/x86/lib/copy_user_64.S:143 7.83% [kernel] [k] clear_page /home/git/linux/arch/x86/lib/clear_page_64.S:39 6.59% [kernel] [k] clear_page /home/git/linux/arch/x86/lib/clear_page_64.S:38 3.66% [kernel] [k] page_fault /home/git/linux/arch/x86/kernel/entry_64.S:1379 3.25% [kernel] [k] clear_page /home/git/linux/arch/x86/lib/clear_page_64.S:40 3.12% [kernel] [k] clear_page /home/git/linux/arch/x86/lib/clear_page_64.S:37 2.74% [kernel] [k] clear_page /home/git/linux/arch/x86/lib/clear_page_64.S:36 2.39% [kernel] [k] clear_page /home/git/linux/arch/x86/lib/clear_page_64.S:43 2.12% [kernel] [k] ioread32 /home/git/linux/lib/iomap.c:90 1.51% [kernel] [k] copy_user_generic_unrolled /home/git/linux/arch/x86/lib/copy_user_64.S:144 1.19% [kernel] [k] copy_user_generic_unrolled /home/git/linux/arch/x86/lib/copy_user_64.S:154 Suggested-by: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-pdmqbng9twz06jzkbgtuwbp8@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
194 lines
3.8 KiB
Plaintext
194 lines
3.8 KiB
Plaintext
perf-top(1)
|
|
===========
|
|
|
|
NAME
|
|
----
|
|
perf-top - System profiling tool.
|
|
|
|
SYNOPSIS
|
|
--------
|
|
[verse]
|
|
'perf top' [-e <EVENT> | --event=EVENT] [<options>]
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
This command generates and displays a performance counter profile in real time.
|
|
|
|
|
|
OPTIONS
|
|
-------
|
|
-a::
|
|
--all-cpus::
|
|
System-wide collection. (default)
|
|
|
|
-c <count>::
|
|
--count=<count>::
|
|
Event period to sample.
|
|
|
|
-C <cpu-list>::
|
|
--cpu=<cpu>::
|
|
Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a
|
|
comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
|
|
Default is to monitor all CPUS.
|
|
|
|
-d <seconds>::
|
|
--delay=<seconds>::
|
|
Number of seconds to delay between refreshes.
|
|
|
|
-e <event>::
|
|
--event=<event>::
|
|
Select the PMU event. Selection can be a symbolic event name
|
|
(use 'perf list' to list all events) or a raw PMU
|
|
event (eventsel+umask) in the form of rNNN where NNN is a
|
|
hexadecimal event descriptor.
|
|
|
|
-E <entries>::
|
|
--entries=<entries>::
|
|
Display this many functions.
|
|
|
|
-f <count>::
|
|
--count-filter=<count>::
|
|
Only display functions with more events than this.
|
|
|
|
-g::
|
|
--group::
|
|
Put the counters into a counter group.
|
|
|
|
-F <freq>::
|
|
--freq=<freq>::
|
|
Profile at this frequency.
|
|
|
|
-i::
|
|
--inherit::
|
|
Child tasks inherit counters, only makes sens with -p option.
|
|
|
|
-k <path>::
|
|
--vmlinux=<path>::
|
|
Path to vmlinux. Required for annotation functionality.
|
|
|
|
-m <pages>::
|
|
--mmap-pages=<pages>::
|
|
Number of mmapped data pages.
|
|
|
|
-p <pid>::
|
|
--pid=<pid>::
|
|
Profile events on existing Process ID (comma separated list).
|
|
|
|
-t <tid>::
|
|
--tid=<tid>::
|
|
Profile events on existing thread ID (comma separated list).
|
|
|
|
-u::
|
|
--uid=::
|
|
Record events in threads owned by uid. Name or number.
|
|
|
|
-r <priority>::
|
|
--realtime=<priority>::
|
|
Collect data with this RT SCHED_FIFO priority.
|
|
|
|
-s <symbol>::
|
|
--sym-annotate=<symbol>::
|
|
Annotate this symbol.
|
|
|
|
-K::
|
|
--hide_kernel_symbols::
|
|
Hide kernel symbols.
|
|
|
|
-U::
|
|
--hide_user_symbols::
|
|
Hide user symbols.
|
|
|
|
-D::
|
|
--dump-symtab::
|
|
Dump the symbol table used for profiling.
|
|
|
|
-v::
|
|
--verbose::
|
|
Be more verbose (show counter open errors, etc).
|
|
|
|
-z::
|
|
--zero::
|
|
Zero history across display updates.
|
|
|
|
-s::
|
|
--sort::
|
|
Sort by key(s): pid, comm, dso, symbol, parent, srcline.
|
|
|
|
-n::
|
|
--show-nr-samples::
|
|
Show a column with the number of samples.
|
|
|
|
--show-total-period::
|
|
Show a column with the sum of periods.
|
|
|
|
--dsos::
|
|
Only consider symbols in these dsos.
|
|
|
|
--comms::
|
|
Only consider symbols in these comms.
|
|
|
|
--symbols::
|
|
Only consider these symbols.
|
|
|
|
-M::
|
|
--disassembler-style=:: Set disassembler style for objdump.
|
|
|
|
--source::
|
|
Interleave source code with assembly code. Enabled by default,
|
|
disable with --no-source.
|
|
|
|
--asm-raw::
|
|
Show raw instruction encoding of assembly instructions.
|
|
|
|
-G [type,min,order]::
|
|
--call-graph::
|
|
Display call chains using type, min percent threshold and order.
|
|
type can be either:
|
|
- flat: single column, linear exposure of call chains.
|
|
- graph: use a graph tree, displaying absolute overhead rates.
|
|
- fractal: like graph, but displays relative rates. Each branch of
|
|
the tree is considered as a new profiled object.
|
|
|
|
order can be either:
|
|
- callee: callee based call graph.
|
|
- caller: inverted caller based call graph.
|
|
|
|
Default: fractal,0.5,callee.
|
|
|
|
INTERACTIVE PROMPTING KEYS
|
|
--------------------------
|
|
|
|
[d]::
|
|
Display refresh delay.
|
|
|
|
[e]::
|
|
Number of entries to display.
|
|
|
|
[E]::
|
|
Event to display when multiple counters are active.
|
|
|
|
[f]::
|
|
Profile display filter (>= hit count).
|
|
|
|
[F]::
|
|
Annotation display filter (>= % of total).
|
|
|
|
[s]::
|
|
Annotate symbol.
|
|
|
|
[S]::
|
|
Stop annotation, return to full profile display.
|
|
|
|
[z]::
|
|
Toggle event count zeroing across display updates.
|
|
|
|
[qQ]::
|
|
Quit.
|
|
|
|
Pressing any unmapped key displays a menu, and prompts for input.
|
|
|
|
|
|
SEE ALSO
|
|
--------
|
|
linkperf:perf-stat[1], linkperf:perf-list[1]
|