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Date: Wed, 23 Aug 2023 01:08:19 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
James Clark <james.clark@....com>,
Kan Liang <kan.liang@...ux.intel.com>,
John Garry <john.g.garry@...cle.com>,
Kajol Jain <kjain@...ux.ibm.com>,
Jing Zhang <renyu.zj@...ux.alibaba.com>,
Ravi Bangoria <ravi.bangoria@....com>,
Rob Herring <robh@...nel.org>,
Gaosheng Cui <cuigaosheng1@...wei.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 16/25] perf pmu-events: Add pmu_events_table__find_event
jevents stores events sorted by name. Add a find function that will
binary search event names avoiding the need to linearly search through
events. Add a test in tests/pmu-events.c. If the PMU or event aren't
found -1000 is returned. If the event is found but no callback
function given, 0 is returned. This allows the find function also act
as a test for existence.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/pmu-events/empty-pmu-events.c | 16 ++++++
tools/perf/pmu-events/jevents.py | 64 ++++++++++++++++++++++++
tools/perf/pmu-events/pmu-events.h | 5 ++
tools/perf/tests/pmu-events.c | 5 ++
4 files changed, 90 insertions(+)
diff --git a/tools/perf/pmu-events/empty-pmu-events.c b/tools/perf/pmu-events/empty-pmu-events.c
index 2d6f748280ac..ef18d403f25f 100644
--- a/tools/perf/pmu-events/empty-pmu-events.c
+++ b/tools/perf/pmu-events/empty-pmu-events.c
@@ -282,6 +282,22 @@ int pmu_events_table__for_each_event(const struct pmu_events_table *table, struc
return 0;
}
+int pmu_events_table__find_event(const struct pmu_events_table *table,
+ struct perf_pmu *pmu,
+ const char *name,
+ pmu_event_iter_fn fn,
+ void *data)
+{
+ for (const struct pmu_event *pe = &table->entries[0]; pe->name; pe++) {
+ if (pmu && !pmu__name_match(pmu, pe->pmu))
+ continue;
+
+ if (!strcasecmp(pe->name, name))
+ return fn(pe, table, data);
+ }
+ return -1000;
+}
+
int pmu_metrics_table__for_each_metric(const struct pmu_metrics_table *table, pmu_metric_iter_fn fn,
void *data)
{
diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index 396af53e0e45..991fcf6cca64 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -825,6 +825,49 @@ static int pmu_events_table__for_each_event_pmu(const struct pmu_events_table *t
return 0;
}
+static int pmu_events_table__find_event_pmu(const struct pmu_events_table *table,
+ const struct pmu_table_entry *pmu,
+ const char *name,
+ pmu_event_iter_fn fn,
+ void *data)
+{
+ struct pmu_event pe = {
+ .pmu = &big_c_string[pmu->pmu_name.offset],
+ };
+ int low = 0, high = pmu->num_entries - 1;
+
+ while (low <= high) {
+ int cmp, mid = (low + high) / 2;
+
+ decompress_event(pmu->entries[mid].offset, &pe);
+
+ if (!pe.name && !name)
+ goto do_call;
+
+ if (!pe.name && name) {
+ low = mid + 1;
+ continue;
+ }
+ if (pe.name && !name) {
+ high = mid - 1;
+ continue;
+ }
+
+ cmp = strcasecmp(pe.name, name);
+ if (cmp < 0) {
+ low = mid + 1;
+ continue;
+ }
+ if (cmp > 0) {
+ high = mid - 1;
+ continue;
+ }
+ do_call:
+ return fn ? fn(&pe, table, data) : 0;
+ }
+ return -1000;
+}
+
int pmu_events_table__for_each_event(const struct pmu_events_table *table,
struct perf_pmu *pmu,
pmu_event_iter_fn fn,
@@ -845,6 +888,27 @@ int pmu_events_table__for_each_event(const struct pmu_events_table *table,
return 0;
}
+int pmu_events_table__find_event(const struct pmu_events_table *table,
+ struct perf_pmu *pmu,
+ const char *name,
+ pmu_event_iter_fn fn,
+ void *data)
+{
+ for (size_t 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];
+ int ret;
+
+ if (!pmu__name_match(pmu, pmu_name))
+ continue;
+
+ ret = pmu_events_table__find_event_pmu(table, table_pmu, name, fn, data);
+ if (ret != -1000)
+ return ret;
+ }
+ return -1000;
+}
+
static int pmu_metrics_table__for_each_metric_pmu(const struct pmu_metrics_table *table,
const struct pmu_table_entry *pmu,
pmu_metric_iter_fn fn,
diff --git a/tools/perf/pmu-events/pmu-events.h b/tools/perf/pmu-events/pmu-events.h
index c0303ba42e97..9882b7125761 100644
--- a/tools/perf/pmu-events/pmu-events.h
+++ b/tools/perf/pmu-events/pmu-events.h
@@ -81,6 +81,11 @@ int pmu_events_table__for_each_event(const struct pmu_events_table *table,
struct perf_pmu *pmu,
pmu_event_iter_fn fn,
void *data);
+int pmu_events_table__find_event(const struct pmu_events_table *table,
+ struct perf_pmu *pmu,
+ const char *name,
+ pmu_event_iter_fn fn,
+ void *data);
int pmu_metrics_table__for_each_metric(const struct pmu_metrics_table *table, pmu_metric_iter_fn fn,
void *data);
diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
index 92d1f6f0e666..34f0de182fa9 100644
--- a/tools/perf/tests/pmu-events.c
+++ b/tools/perf/tests/pmu-events.c
@@ -546,6 +546,11 @@ static int __test_core_pmu_event_aliases(char *pmu_name, int *count)
pmu_add_cpu_aliases_table(pmu, table);
+ res = pmu_events_table__find_event(table, pmu, "bp_l1_btb_correct", NULL, NULL);
+ if (res != 0) {
+ pr_debug("Missing test event in test architecture");
+ return res;
+ }
for (; *test_event_table; test_event_table++) {
struct perf_pmu_test_event test_event = **test_event_table;
struct pmu_event const *event = &test_event.event;
--
2.42.0.rc1.204.g551eb34607-goog
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