c45c6ea2e5
This patch adds a -C option to stat, record, top to designate a list of CPUs to monitor. CPUs can be specified as a comma-separated list or ranges, no space allowed. Examples: $ perf record -a -C0-1,4-7 sleep 1 $ perf top -C0-4 $ perf stat -a -C1,2,3,4 sleep 1 With perf record in per-thread mode with inherit mode on, samples are collected only when the thread runs on the designated CPUs. The -C option does not turn on system-wide mode automatically. Cc: David S. Miller <davem@davemloft.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4bff9496.d345d80a.41fe.7b00@mx.google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
77 lines
1.9 KiB
Plaintext
77 lines
1.9 KiB
Plaintext
perf-stat(1)
|
|
============
|
|
|
|
NAME
|
|
----
|
|
perf-stat - Run a command and gather performance counter statistics
|
|
|
|
SYNOPSIS
|
|
--------
|
|
[verse]
|
|
'perf stat' [-e <EVENT> | --event=EVENT] [-S] [-a] <command>
|
|
'perf stat' [-e <EVENT> | --event=EVENT] [-S] [-a] -- <command> [<options>]
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
This command runs a command and gathers performance counter statistics
|
|
from it.
|
|
|
|
|
|
OPTIONS
|
|
-------
|
|
<command>...::
|
|
Any command you can specify in a shell.
|
|
|
|
|
|
-e::
|
|
--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.
|
|
|
|
-i::
|
|
--no-inherit::
|
|
child tasks do not inherit counters
|
|
-p::
|
|
--pid=<pid>::
|
|
stat events on existing pid
|
|
|
|
-a::
|
|
system-wide collection
|
|
|
|
-c::
|
|
scale counter values
|
|
|
|
-B::
|
|
print large numbers with thousands' separators according to locale
|
|
|
|
-C::
|
|
--cpu=::
|
|
Count only on the list of cpus provided. Multiple CPUs can be provided as a
|
|
comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
|
|
In per-thread mode, this option is ignored. The -a option is still necessary
|
|
to activate system-wide monitoring. Default is to count on all CPUs.
|
|
|
|
EXAMPLES
|
|
--------
|
|
|
|
$ perf stat -- make -j
|
|
|
|
Performance counter stats for 'make -j':
|
|
|
|
8117.370256 task clock ticks # 11.281 CPU utilization factor
|
|
678 context switches # 0.000 M/sec
|
|
133 CPU migrations # 0.000 M/sec
|
|
235724 pagefaults # 0.029 M/sec
|
|
24821162526 CPU cycles # 3057.784 M/sec
|
|
18687303457 instructions # 2302.138 M/sec
|
|
172158895 cache references # 21.209 M/sec
|
|
27075259 cache misses # 3.335 M/sec
|
|
|
|
Wall-clock time elapsed: 719.554352 msecs
|
|
|
|
SEE ALSO
|
|
--------
|
|
linkperf:perf-top[1], linkperf:perf-list[1]
|