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| author |   Ian Rogers <irogers@google.com> | 2020-04-02 08:43:53 -0700 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-04-16 12:19:12 -0300 |
| commit | 2a4b51666af8bf0b67ccc2e53120bad27351917c (patch) | |
| tree | 80b83a1a3bd37d5d10972be4f9d322fbc2cfaef6 /tools/perf/Documentation/perf-bench.txt | |
| parent | perf script: Simplify auxiliary event printing functions (diff) | |
| download | wireguard-linux-2a4b51666af8bf0b67ccc2e53120bad27351917c.tar.xz wireguard-linux-2a4b51666af8bf0b67ccc2e53120bad27351917c.zip | |
perf bench: Add event synthesis benchmark
Event synthesis may occur at the start or end (tail) of a perf command.
In system-wide mode it can scan every process in /proc, which may add
seconds of latency before event recording. Add a new benchmark that
times how long event synthesis takes with and without data synthesis.
An example execution looks like:
$ perf bench internals synthesize
# Running 'internals/synthesize' benchmark:
Average synthesis took: 168.253800 usec
Average data synthesis took: 208.104700 usec
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrey Zhizhikin <andrey.z@gmail.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20200402154357.107873-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-bench.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-bench.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-bench.txt b/tools/perf/Documentation/perf-bench.txt index 0921a3c67381..bad16512c48d 100644 --- a/tools/perf/Documentation/perf-bench.txt +++ b/tools/perf/Documentation/perf-bench.txt @@ -61,6 +61,9 @@ SUBSYSTEM 'epoll':: Eventpoll (epoll) stressing benchmarks. +'internals':: + Benchmark internal perf functionality. + 'all':: All benchmark subsystems. @@ -214,6 +217,11 @@ Suite for evaluating concurrent epoll_wait calls. *ctl*:: Suite for evaluating multiple epoll_ctl calls. +SUITES FOR 'internals' +~~~~~~~~~~~~~~~~~~~~~~ +*synthesize*:: +Suite for evaluating perf's event synthesis performance. + SEE ALSO -------- linkperf:perf[1] |