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perf pmu: Cache JSON events table

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Cache the JSON events table so that finding it isn't done per
event/alias.

Change the events table find so that when the PMU is given, if the PMU
has no JSON events return null.

Update usage to always use the PMU variable.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Gaosheng Cui <cuigaosheng1@huawei.com>
Cc: Ingo Molnar <mingo@redhat.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: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230824041330.266337-13-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-08-23 21:13:24 -07:00 committed by Arnaldo Carvalho de Melo
parent f63a536f03
commit 7c52f10c0d
4 changed files with 25 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
tools/perf/pmu-events/jevents.py
View File

@ -948,7 +948,7 @@ const struct pmu_events_table *perf_pmu__find_events_table(struct perf_pmu *pmu)
{
const struct pmu_events_table *table = NULL;
char *cpuid = perf_pmu__getcpuid(pmu);
int i;
size_t i;
/* on some platforms which uses cpus map, cpuid can be NULL for
* PMUs other than CORE PMUs.
@ -968,7 +968,17 @@ const struct pmu_events_table *perf_pmu__find_events_table(struct perf_pmu *pmu)
}
}
free(cpuid);
return table;
if (!pmu)
return table;
for (i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
if (pmu__name_match(pmu, pmu_name))
return table;
}
return NULL;
}
const struct pmu_metrics_table *perf_pmu__find_metrics_table(struct perf_pmu *pmu)

2
tools/perf/tests/pmu-events.c
View File

@ -544,6 +544,7 @@ static int __test_core_pmu_event_aliases(char *pmu_name, int *count)
INIT_LIST_HEAD(&pmu->list);
pmu->name = strdup(pmu_name);
pmu->events_table = table;
pmu_add_cpu_aliases_table(pmu, table);
res = pmu_events_table__find_event(table, pmu, "bp_l1_btb_correct", NULL, NULL);
@ -583,6 +584,7 @@ static int __test_uncore_pmu_event_aliases(struct perf_pmu_test_pmu *test_pmu)
events_table = find_core_events_table("testarch", "testcpu");
if (!events_table)
return -1;
pmu->events_table = events_table;
pmu_add_cpu_aliases_table(pmu, events_table);
pmu_add_sys_aliases(pmu);

16
tools/perf/util/pmu.c
View File

@ -522,10 +522,10 @@ static int perf_pmu__new_alias(struct perf_pmu *pmu, int dirfd, const char *name
}
if (!pe) {
/* Update an event from sysfs with json data. */
const struct pmu_events_table *table = perf_pmu__find_events_table(pmu);
if (table)
pmu_events_table__find_event(table, pmu, name, update_alias, alias);
if (pmu->events_table) {
pmu_events_table__find_event(pmu->events_table, pmu, name,
update_alias, alias);
}
}
/* Scan event and remove leading zeroes, spaces, newlines, some
@ -875,13 +875,10 @@ void pmu_add_cpu_aliases_table(struct perf_pmu *pmu, const struct pmu_events_tab
static void pmu_add_cpu_aliases(struct perf_pmu *pmu)
{
const struct pmu_events_table *table;
table = perf_pmu__find_events_table(pmu);
if (!table)
if (!pmu->events_table)
return;
pmu_add_cpu_aliases_table(pmu, table);
pmu_add_cpu_aliases_table(pmu, pmu->events_table);
}
static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe,
@ -992,6 +989,7 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char
if (pmu->is_uncore)
pmu->id = pmu_id(name);
pmu->max_precise = pmu_max_precise(dirfd, pmu);
pmu->events_table = perf_pmu__find_events_table(pmu);
pmu_add_cpu_aliases(pmu);
pmu_add_sys_aliases(pmu);
list_add_tail(&pmu->list, pmus);

4
tools/perf/util/pmu.h
View File

@ -114,6 +114,10 @@ struct perf_pmu {
* from json events in pmu-events.c.
*/
struct list_head aliases;
/**
* @events_table: The events table for json events in pmu-events.c.
*/
const struct pmu_events_table *events_table;
/** @caps_initialized: Has the list caps been initialized? */
bool caps_initialized;
/** @nr_caps: The length of the list caps. */