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perf metric: Add #num_cpus_online literal

Browse source 
Returns the number of CPUs online, unlike #num_cpus that returns the
number present.

Add a test of the property.

This will be used in future Intel metrics.

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20230830073026.1829912-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-08-30 00:30:26 -07:00 committed by Arnaldo Carvalho de Melo
parent 30f0b435bb
commit f0005f1732
2 changed files with 11 additions and 1 deletions
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5
tools/perf/tests/expr.c
View file

@ -70,7 +70,7 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
{
struct expr_id_data *val_ptr;
const char *p;
double val, num_cpus, num_cores, num_dies, num_packages;
double val, num_cpus_online, num_cpus, num_cores, num_dies, num_packages;
int ret;
struct expr_parse_ctx *ctx;
bool is_intel = false;
@ -227,7 +227,10 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
/* Test toplogy constants appear well ordered. */
expr__ctx_clear(ctx);
TEST_ASSERT_VAL("#num_cpus_online",
expr__parse(&num_cpus_online, ctx, "#num_cpus_online") == 0);
TEST_ASSERT_VAL("#num_cpus", expr__parse(&num_cpus, ctx, "#num_cpus") == 0);
TEST_ASSERT_VAL("#num_cpus >= #num_cpus_online", num_cpus >= num_cpus_online);
TEST_ASSERT_VAL("#num_cores", expr__parse(&num_cores, ctx, "#num_cores") == 0);
TEST_ASSERT_VAL("#num_cpus >= #num_cores", num_cpus >= num_cores);
TEST_ASSERT_VAL("#num_dies", expr__parse(&num_dies, ctx, "#num_dies") == 0);

7
tools/perf/util/expr.c
View file

@ -427,6 +427,13 @@ double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx
result = cpu__max_present_cpu().cpu;
goto out;
}
if (!strcmp("#num_cpus_online", literal)) {
struct perf_cpu_map *online = cpu_map__online();
if (online)
result = perf_cpu_map__nr(online);
goto out;
}
if (!strcasecmp("#system_tsc_freq", literal)) {
result = arch_get_tsc_freq();