linux-kernel - [PATCH v1 2/5] perf: Release old CPU maps after merging

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240925195325.426533-3-leo.yan@arm.com>
Date: Wed, 25 Sep 2024 20:53:22 +0100
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	James Clark <james.clark@...aro.org>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH v1 2/5] perf: Release old CPU maps after merging

After CPU maps are merged, the old CPU map will not automatically
released.

This commit adds a new variable to record old CPU map, after merging the
new allocated map is returned, and release the old CPU map.

Signed-off-by: Leo Yan <leo.yan@....com>
---
 tools/lib/perf/evlist.c      | 4 ++++
 tools/perf/util/mem-events.c | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index c6d67fc9e57e..37920e0b0cd6 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -36,6 +36,8 @@ void perf_evlist__init(struct perf_evlist *evlist)
 static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
 					  struct perf_evsel *evsel)
 {
+	struct perf_cpu_map *old_all_cpus;
+
 	if (evsel->system_wide) {
 		/* System wide: set the cpu map of the evsel to all online CPUs. */
 		perf_cpu_map__put(evsel->cpus);
@@ -75,7 +77,9 @@ static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
 		evsel->threads = perf_thread_map__get(evlist->threads);
 	}
 
+	old_all_cpus = evlist->all_cpus;
 	evlist->all_cpus = perf_cpu_map__merge(evlist->all_cpus, evsel->cpus);
+	perf_cpu_map__put(old_all_cpus);
 }
 
 static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index 051feb93ed8d..016a1f4adb5d 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -257,7 +257,7 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr)
 	int i = *argv_nr;
 	const char *s;
 	char *copy;
-	struct perf_cpu_map *cpu_map = NULL;
+	struct perf_cpu_map *cpu_map = NULL, *old_cpu_map;
 
 	while ((pmu = perf_pmus__scan_mem(pmu)) != NULL) {
 		for (int j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
@@ -283,7 +283,9 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr)
 			rec_argv[i++] = "-e";
 			rec_argv[i++] = copy;
 
+			old_cpu_map = cpu_map;
 			cpu_map = perf_cpu_map__merge(cpu_map, pmu->cpus);
+			perf_cpu_map__put(old_cpu_map);
 		}
 	}
 
-- 
2.34.1