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Message-Id: <20241107125308.41226-4-leo.yan@arm.com>
Date: Thu, 7 Nov 2024 12:53:08 +0000
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Ian Rogers <irogers@...gle.com>,
Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
"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 v2 3/3] perf cpumap: Add checking for reference counter
For the CPU map merging test, add an extra check for the reference
counter before releasing the last CPU map.
Signed-off-by: Leo Yan <leo.yan@....com>
---
tools/perf/tests/cpumap.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/tools/perf/tests/cpumap.c b/tools/perf/tests/cpumap.c
index f8187a801b8e..5ed7ff072ea3 100644
--- a/tools/perf/tests/cpumap.c
+++ b/tools/perf/tests/cpumap.c
@@ -167,6 +167,15 @@ static int __test__cpu_map_merge(const char *lhs, const char *rhs, int nr, const
cpu_map__snprint(a, buf, sizeof(buf));
TEST_ASSERT_VAL("failed to merge map: bad result", !strcmp(buf, expected));
perf_cpu_map__put(b);
+
+ /*
+ * If 'b' is a superset of 'a', 'a' points to the same map with the
+ * map 'b'. In this case, the owner 'b' has released the resource above
+ * but 'a' still keeps the ownership, the reference counter should be 1.
+ */
+ TEST_ASSERT_VAL("unexpected refcnt: bad result",
+ refcount_read(perf_cpu_map__refcnt(a)) == 1);
+
perf_cpu_map__put(a);
return 0;
}
--
2.34.1
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