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| author | Stephane Eranian <eranian@google.com> | 2013-02-06 15:46:02 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-02-06 18:09:27 -0300 |
| commit | d7e7a451c13e784f497c054f1bd083d77be87498 (patch) | |
| tree | 24aa7acacd6cd74da0b2ecaf4c9a40724fa2f107 /tools/perf/Documentation | |
| parent | 5ac59a8a77e3faa1eaf9bfe82a61e9396b082c3d (diff) | |
| download | linux-d7e7a451c13e784f497c054f1bd083d77be87498.tar.bz2 | |
perf stat: Add per processor socket count aggregation
This patch adds per-processor socket count aggregation for system-wide
mode measurements. This is a useful mode to detect imbalance between
sockets.
To enable this mode, use --aggr-socket in addition
to -a. (system-wide).
The output includes the socket number and the number of online
processors on that socket. This is useful to gauge the amount of
aggregation.
# ./perf stat -I 1000 -a --aggr-socket -e cycles sleep 2
# time socket cpus counts events
1.000097680 S0 4 5,788,785 cycles
2.000379943 S0 4 27,361,546 cycles
2.001167808 S0 4 818,275 cycles
Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1360161962-9675-3-git-send-email-eranian@google.com
[ committer note: Added missing man page entry based on above comments ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-stat.txt | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 5289da3344e9..faf4f4feebcc 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -116,9 +116,16 @@ perf stat --repeat 10 --null --sync --pre 'make -s O=defconfig-build/clean' -- m -I msecs:: --interval-print msecs:: - print count deltas every N milliseconds (minimum: 100ms) + Print count deltas every N milliseconds (minimum: 100ms) example: perf stat -I 1000 -e cycles -a sleep 5 +--aggr-socket:: +Aggregate counts per processor socket for system-wide mode measurements. This +is a useful mode to detect imbalance between sockets. To enable this mode, +use --aggr-socket in addition to -a. (system-wide). The output includes the +socket number and the number of online processors on that socket. This is +useful to gauge the amount of aggregation. + EXAMPLES -------- |