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From:   Yang Jihong <yangjihong1@huawei.com>
To:     <peterz@infradead.org>, <mingo@redhat.com>, <acme@kernel.org>,
        <mark.rutland@arm.com>, <alexander.shishkin@linux.intel.com>,
        <jolsa@kernel.org>, <namhyung@kernel.org>, <irogers@google.com>,
        <adrian.hunter@intel.com>, <linux-perf-users@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
CC:     <yangjihong1@huawei.com>
Subject: [PATCH] perf pmu: Filter out search events table of software pmu in perf_pmu__lookup()
Date:   Mon, 16 Oct 2023 09:33:09 +0000
Message-ID: <20231016093309.726436-1-yangjihong1@huawei.com>
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Precedence: bulk

For software pmu, the events_table is empty, reducing unnecessary search.

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
---
 tools/perf/util/pmu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 6428e2648289..59c8394a4efa 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1033,7 +1033,8 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char
 		pmu->id = pmu_id(name);
 	pmu->max_precise = pmu_max_precise(dirfd, pmu);
 	pmu->alias_name = pmu_find_alias_name(pmu, dirfd);
-	pmu->events_table = perf_pmu__find_events_table(pmu);
+	if (!perf_pmu__is_software(pmu))
+		pmu->events_table = perf_pmu__find_events_table(pmu);
 	pmu_add_sys_aliases(pmu);
 	list_add_tail(&pmu->list, pmus);
 
-- 
2.34.1