2013-01-24 23:10:38 +08:00
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perf-mem(1)
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===========
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NAME
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----
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perf-mem - Profile memory accesses
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SYNOPSIS
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--------
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[verse]
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'perf mem' [<options>] (record [<command>] | report)
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DESCRIPTION
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-----------
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2014-12-17 23:23:55 +08:00
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"perf mem record" runs a command and gathers memory operation data
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2013-01-24 23:10:38 +08:00
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from it, into perf.data. Perf record options are accepted and are passed through.
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2014-12-17 23:23:55 +08:00
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"perf mem report" displays the result. It invokes perf report with the
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right set of options to display a memory access profile. By default, loads
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and stores are sampled. Use the -t option to limit to loads or stores.
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2013-01-24 23:10:38 +08:00
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2014-02-28 22:02:14 +08:00
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Note that on Intel systems the memory latency reported is the use-latency,
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not the pure load (or store latency). Use latency includes any pipeline
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queueing delays in addition to the memory subsystem latency.
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2013-01-24 23:10:38 +08:00
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OPTIONS
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-------
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<command>...::
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Any command you can specify in a shell.
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2018-04-22 15:29:06 +08:00
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-i::
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--input=<file>::
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Input file name.
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2018-02-12 04:38:37 +08:00
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-f::
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--force::
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Don't do ownership validation
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2013-01-24 23:10:38 +08:00
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-t::
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2018-04-22 15:29:06 +08:00
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--type=<type>::
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2014-12-17 23:23:55 +08:00
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Select the memory operation type: load or store (default: load,store)
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2013-01-24 23:10:38 +08:00
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-D::
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2018-04-22 15:29:06 +08:00
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--dump-raw-samples::
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2013-01-24 23:10:38 +08:00
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Dump the raw decoded samples on the screen in a format that is easy to parse with
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one sample per line.
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-x::
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2018-04-22 15:29:06 +08:00
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--field-separator=<separator>::
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2013-01-24 23:10:38 +08:00
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Specify the field separator used when dump raw samples (-D option). By default,
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The separator is the space character.
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-C::
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2018-04-22 15:29:06 +08:00
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--cpu=<cpu>::
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Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a
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comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. Default
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is to monitor all CPUS.
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-U::
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--hide-unresolved::
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Only display entries resolved to a symbol.
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-p::
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--phys-data::
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Record/Report sample physical addresses
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perf mem: Support data page size
Add option --data-page-size in "perf mem" to record/report data page
size.
Here are some examples:
# perf mem --phys-data --data-page-size report -D
# PID, TID, IP, ADDR, PHYS ADDR, DATA PAGE SIZE, LOCAL WEIGHT, DSRC, SYMBOL
20134 20134 0xffffffffb5bd2fd0 0x016ffff9a274e96a308 0x000000044e96a308 4K 1168 0x5080144 /lib/modules/4.18.0-rc7+/build/vmlinux:perf_ctx_unlock
20134 20134 0xffffffffb63f645c 0xffffffffb752b814 0xcfb52b814 2M 225 0x26a100142 /lib/modules/4.18.0-rc7+/build/vmlinux:_raw_spin_lock
20134 20134 0xffffffffb660300c 0xfffffe00016b8bb0 0x0 4K 0 0x5080144 /lib/modules/4.18.0-rc7+/build/vmlinux:__x86_indirect_thunk_rax
#
# perf mem --phys-data --data-page-size report --stdio
# To display the perf.data header info, please use
# --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 5K of event 'cpu/mem-loads,ldlat=30/P'
# Total weight : 281234
# Sort order :
# mem,sym,dso,symbol_daddr,dso_daddr,tlb,locked,phys_daddr,data_page_size
#
# Overhead Samples Memory access Symbol Shared Object Data Symbol Data Object TLB access Locked Data Physical Address Data Page Size
# ........ ....... ............. ............................ ................ ...................... ........... ............ ...... ...................... ..............
28.54% 1826 L1 or L1 hit [k] __x86_indirect_thunk_rax [kernel.vmlinux] [k] 0xffffb0df31b0ff28 [unknown] L1 or L2 hit No [k] 0x0000000000000000 4K
6.02% 256 L1 or L1 hit [.] touch_buffer dtlb [.] 0x00007ffd50109da8 [stack] L1 or L2 hit No [.] 0x000000042454ada8 4K
3.23% 5 L1 or L1 hit [k] clear_huge_page [kernel.vmlinux] [k] 0xffff9a2753b8ce60 [unknown] L1 or L2 hit No [k] 0x0000000453b8ce60 2M
2.98% 4 L1 or L1 hit [k] clear_page_erms [kernel.vmlinux] [k] 0xffffb0df31b0fd00 [unknown] L1 or L2 hit No [k] 0x0000000000000000 4K
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Stephane Eranian <eranian@google.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210105195752.43489-3-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-01-06 03:57:48 +08:00
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--data-page-size::
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Record/Report sample data address page size
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2018-04-22 15:29:06 +08:00
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RECORD OPTIONS
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--------------
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-e::
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--event <event>::
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Event selector. Use 'perf mem record -e list' to list available events.
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2013-01-24 23:10:38 +08:00
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2016-03-24 20:52:16 +08:00
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-K::
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--all-kernel::
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Configure all used events to run in kernel space.
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-U::
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--all-user::
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Configure all used events to run in user space.
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2018-04-22 15:29:06 +08:00
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-v::
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--verbose::
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Be more verbose (show counter open errors, etc)
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2016-06-15 02:19:11 +08:00
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2018-04-22 15:29:06 +08:00
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--ldlat <n>::
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2019-01-29 21:24:12 +08:00
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Specify desired latency for loads event. (x86 only)
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2017-08-30 01:11:10 +08:00
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2018-04-07 04:38:09 +08:00
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In addition, for report all perf report options are valid, and for record
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all perf record options.
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2013-01-24 23:10:38 +08:00
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SEE ALSO
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--------
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linkperf:perf-record[1], linkperf:perf-report[1]
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