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authorStephane Eranian <eranian@google.com>2013-02-06 15:46:02 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-02-06 18:09:27 -0300
commitd7e7a451c13e784f497c054f1bd083d77be87498 (patch)
tree24aa7acacd6cd74da0b2ecaf4c9a40724fa2f107 /tools/perf/Documentation
parent5ac59a8a77e3faa1eaf9bfe82a61e9396b082c3d (diff)
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.txt9
1 files changed, 8 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 5289da3344e..faf4f4feebc 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
--------