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| author | Dmitry Vyukov <dvyukov@google.com> | 2025-02-13 12:08:18 +0300 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2025-02-19 01:04:32 +0300 |
| commit | ee1cffbe24e7dc129c737a5f433b35e2ce0bdd78 (patch) | |
| tree | e9ab50befcc526f3ed95cb301051a6174c89593e /tools/perf/util/event.c | |
| parent | 61b6b31c2f51f8757ecc65df8a4f5eeff029a804 (diff) | |
| download | linux-ee1cffbe24e7dc129c737a5f433b35e2ce0bdd78.tar.xz | |
perf report: Add latency output field
Latency output field is similar to overhead, but represents overhead for
latency rather than CPU consumption. It's re-scaled from overhead by dividing
weight by the current parallelism level at the time of the sample.
It effectively models profiling with 1 sample taken per unit of wall-clock
time rather than unit of CPU time.
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lore.kernel.org/r/b6269518758c2166e6ffdc2f0e24cfdecc8ef9c1.1739437531.git.dvyukov@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools/perf/util/event.c')
| -rw-r--r-- | tools/perf/util/event.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c index 6ceed46acd5a..c23b77f8f854 100644 --- a/tools/perf/util/event.c +++ b/tools/perf/util/event.c @@ -771,6 +771,12 @@ int machine__resolve(struct machine *machine, struct addr_location *al, al->parallelism = max(1, min(machine->parallelism, machine__nr_cpus_avail(machine))); if (test_bit(al->parallelism, symbol_conf.parallelism_filter)) al->filtered |= (1 << HIST_FILTER__PARALLELISM); + /* + * Multiply it by some const to avoid precision loss or dealing + * with floats. The multiplier does not matter otherwise since + * we only print it as percents. + */ + al->latency = sample->period * 1000 / al->parallelism; if (al->map) { if (symbol_conf.dso_list && |