diff options
| author | Ian Rogers <irogers@google.com> | 2025-07-18 20:05:07 -0700 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2025-07-24 13:41:35 -0700 |
| commit | 175c852325a1f566426e2470e5d5d67efc7621dd (patch) | |
| tree | dce45d5597579302daf7ef0dd8bf2c64d9d7c513 /tools/perf/util/expr.c | |
| parent | bd741d80dc65922c7d6e5fd855a934f5d2cf2309 (diff) | |
perf tool_pmu: Allow num_cpus(_online) to be specific to a cpumask
For hybrid metrics it is useful to know the number of p-core or e-core
CPUs. If a cpumask is specified for the num_cpus or num_cpus_online
tool events, compute the value relative to the given mask rather than
for the full system.
```
$ sudo /tmp/perf/perf stat -e 'tool/num_cpus/,tool/num_cpus,cpu=cpu_core/,
tool/num_cpus,cpu=cpu_atom/,tool/num_cpus_online/,tool/num_cpus_online,
cpu=cpu_core/,tool/num_cpus_online,cpu=cpu_atom/' true
Performance counter stats for 'true':
28 tool/num_cpus/
16 tool/num_cpus,cpu=cpu_core/
12 tool/num_cpus,cpu=cpu_atom/
28 tool/num_cpus_online/
16 tool/num_cpus_online,cpu=cpu_core/
12 tool/num_cpus_online,cpu=cpu_atom/
0.000767205 seconds time elapsed
0.000938000 seconds user
0.000000000 seconds sys
```
Reviewed-by: Thomas Falcon <thomas.falcon@intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20250719030517.1990983-6-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools/perf/util/expr.c')
| -rw-r--r-- | tools/perf/util/expr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c index ca70a14c7cdf..7fda0ff89c16 100644 --- a/tools/perf/util/expr.c +++ b/tools/perf/util/expr.c @@ -401,7 +401,7 @@ double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx if (ev != TOOL_PMU__EVENT_NONE) { u64 count; - if (tool_pmu__read_event(ev, &count)) + if (tool_pmu__read_event(ev, /*evsel=*/NULL, &count)) result = count; else pr_err("Failure to read '%s'", literal); |