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perf expr: Add metric literals for topology. 

Allow the number of cpus, cores, dies and packages to be queried by a
metric expression.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul A . Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Song Liu <song@kernel.org>
Cc: Wan Jiabing <wanjiabing@vivo.com>
Cc: Yury Norov <yury.norov@gmail.com>
Link: https://lore.kernel.org/r/20211111002109.194172-7-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2021-11-10 16:21:07 -08:00 committed by Arnaldo Carvalho de Melo
parent 3613f6c118
commit fdf1e29b61
2 changed files with 38 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
tools/perf/tests/expr.c
View File

@ -66,7 +66,7 @@ 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;
double val, num_cpus, num_cores, num_dies, num_packages;
int ret;
struct expr_parse_ctx *ctx;
@ -161,6 +161,16 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
NULL, ctx) == 0);
TEST_ASSERT_VAL("find ids", hashmap__size(ctx->ids) == 0);
/* Test toplogy constants appear well ordered. */
expr__ctx_clear(ctx);
TEST_ASSERT_VAL("#num_cpus", expr__parse(&num_cpus, ctx, "#num_cpus") == 0);
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);
TEST_ASSERT_VAL("#num_cores >= #num_dies", num_cores >= num_dies);
TEST_ASSERT_VAL("#num_packages", expr__parse(&num_packages, ctx, "#num_packages") == 0);
TEST_ASSERT_VAL("#num_dies >= #num_packages", num_dies >= num_packages);
expr__ctx_free(ctx);
return 0;

27
tools/perf/util/expr.c
View File

@ -5,6 +5,8 @@
#include <stdlib.h>
#include <string.h>
#include "metricgroup.h"
#include "cpumap.h"
#include "cputopo.h"
#include "debug.h"
#include "expr.h"
#include "expr-bison.h"
@ -375,9 +377,34 @@ double expr_id_data__value(const struct expr_id_data *data)
double expr__get_literal(const char *literal)
{
static struct cpu_topology *topology;
if (!strcmp("#smt_on", literal))
return smt_on() > 0 ? 1.0 : 0.0;
if (!strcmp("#num_cpus", literal))
return cpu__max_present_cpu();
/*
* Assume that topology strings are consistent, such as CPUs "0-1"
* wouldn't be listed as "0,1", and so after deduplication the number of
* these strings gives an indication of the number of packages, dies,
* etc.
*/
if (!topology) {
topology = cpu_topology__new();
if (!topology) {
pr_err("Error creating CPU topology");
return NAN;
}
}
if (!strcmp("#num_packages", literal))
return topology->package_cpus_lists;
if (!strcmp("#num_dies", literal))
return topology->die_cpus_lists;
if (!strcmp("#num_cores", literal))
return topology->core_cpus_lists;
pr_err("Unrecognized literal '%s'", literal);
return NAN;
}