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| author |   Peter Zijlstra <peterz@infradead.org> | 2015-03-31 00:19:31 +0200 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-04-08 10:04:55 -0300 |
| commit | 814c8c38e13c7050259c72f89bb01f3fc903f642 (patch) | |
| tree | bcefeebf548cb2bef07ee42b81518a19ccfe7795 /tools/perf/Documentation | |
| parent | perf sched replay: Use replay_repeat to calculate the runavg of cpu usage instead of the default value 10 (diff) | |
| download | linux-dev-814c8c38e13c7050259c72f89bb01f3fc903f642.tar.xz linux-dev-814c8c38e13c7050259c72f89bb01f3fc903f642.zip | |
perf record: Add clockid parameter
Teach perf-record about the new perf_event_attr::{use_clockid, clockid}
fields. Add a simple parameter to set the clock (if any) to be used for
the events to be recorded into the data file.
Since we store the entire perf_event_attr in the EVENT_DESC section we
also already store the used clockid in the data file.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yunlong Song <yunlong.song@huawei.com>
Link: http://lkml.kernel.org/r/20150407154851.GR23123@twins.programming.kicks-ass.net
[ Conditionally define CLOCK_BOOTTIME, at least rhel6 doesn't have it - dsahern
Ditto for CLOCK_MONOTONIC_RAW, sles11sp2 doesn't have it - yunlong.song ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-record.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 355c4f5569b5..4847a793de65 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -250,6 +250,13 @@ is off by default. --running-time:: Record running and enabled time for read events (:S) +-k:: +--clockid:: +Sets the clock id to use for the various time fields in the perf_event_type +records. See clock_gettime(). In particular CLOCK_MONOTONIC and +CLOCK_MONOTONIC_RAW are supported, some events might also allow +CLOCK_BOOTTIME, CLOCK_REALTIME and CLOCK_TAI. + SEE ALSO -------- linkperf:perf-stat[1], linkperf:perf-list[1] |