[PATCH v4 07/35] perf evsel: Add is_pmu_core inorder to interpret own_cpus

Ian Rogers
2023-05-26T21:55:02Z

The behaviour of handling cpu maps varies for core and other PMUs. For
core PMUs the cpu map lists all valid CPUs, whereas for other PMUs the
map is the default CPU. Add a flag in the evsel to indicate if a PMU
is core to help with later interpreting of the cpu maps and populate
it when the evsel is created during parsing. When propagating cpu
maps, core PMUs should intersect the cpu map of the PMU with the user
requested one.

Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
---
tools/lib/perf/include/internal/evsel.h | 9 +++++++++
tools/perf/util/evsel.c | 1 +
tools/perf/util/parse-events.c | 1 +
3 files changed, 11 insertions(+)

diff --git a/tools/lib/perf/include/internal/evsel.h b/tools/lib/perf/include/internal/evsel.h
index a99a75d9e78f..4d6f2a032f45 100644
--- a/tools/lib/perf/include/internal/evsel.h
+++ b/tools/lib/perf/include/internal/evsel.h
@@ -41,7 +41,14 @@ struct perf_sample_id {
struct perf_evsel {
struct list_head node;
struct perf_event_attr attr;
+ /** The commonly used cpu map of CPUs the event should be opened upon, etc. */
struct perf_cpu_map *cpus;
+ /**
+ * The cpu map read from the PMU. For core PMUs this is the list of all
+ * CPUs the event can be opened upon. For other PMUs this is the default
+ * cpu map for opening the event on, for example, the first CPU on a
+ * socket for an uncore event.
+ */
struct perf_cpu_map *own_cpus;
struct perf_thread_map *threads;
struct xyarray *fd;
@@ -65,6 +72,8 @@ struct perf_evsel {
* i.e. it cannot be the 'any CPU' value of -1.
*/
bool requires_cpu;
+ /** Is the PMU for the event a core one? Effects the handling of own_cpus. */
+ bool is_pmu_core;
int idx;
};

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 2f5910b31fa9..8c8f371ea2b5 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -415,6 +415,7 @@ struct evsel *evsel__clone(struct evsel *orig)
evsel->core.nr_members = orig->core.nr_members;
evsel->core.system_wide = orig->core.system_wide;
evsel->core.requires_cpu = orig->core.requires_cpu;
+ evsel->core.is_pmu_core = orig->core.is_pmu_core;

if (orig->name) {
evsel->name = strdup(orig->name);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index b93264f8a37c..1a0be395c887 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -260,6 +260,7 @@ __add_event(struct list_head *list, int *idx,
evsel->core.cpus = cpus;
evsel->core.own_cpus = perf_cpu_map__get(cpus);
evsel->core.requires_cpu = pmu ? pmu->is_uncore : false;
+ evsel->core.is_pmu_core = pmu ? pmu->is_core : false;
evsel->auto_merge_stats = auto_merge_stats;
evsel->pmu = pmu;
evsel->pmu_name = pmu && pmu->name ? strdup(pmu->name) : NULL;
--
2.41.0.rc0.172.g3f132b7071-goog