The `FIXTURE(args)` macro defines an empty `struct _test_data_args`,
leading to `sizeof(struct _test_data_args)` evaluating to 0. This
caused a build error due to a compiler warning on a `memset` call
with a zero size argument.
Adding a dummy member to the struct ensures its size is non-zero,
resolving the build issue.
Signed-off-by: Wake Liu <wakel(a)google.com>
---
tools/testing/selftests/futex/functional/futex_requeue_pi.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/futex/functional/futex_requeue_pi.c b/tools/testing/selftests/futex/functional/futex_requeue_pi.c
index f299d75848cd..000fec468835 100644
--- a/tools/testing/selftests/futex/functional/futex_requeue_pi.c
+++ b/tools/testing/selftests/futex/functional/futex_requeue_pi.c
@@ -52,6 +52,7 @@ struct thread_arg {
FIXTURE(args)
{
+ char dummy;
};
FIXTURE_SETUP(args)
--
2.52.0.rc1.455.g30608eb744-goog
test_memcg_sock() currently requires that memory.stat's "sock " counter
is exactly zero immediately after the TCP server exits. On a busy system
this assumption is too strict:
- Socket memory may be freed with a small delay (e.g. RCU callbacks).
- memcg statistics are updated asynchronously via the rstat flushing
worker, so the "sock " value in memory.stat can stay non-zero for a
short period of time even after all socket memory has been uncharged.
As a result, test_memcg_sock() can intermittently fail even though socket
memory accounting is working correctly.
Make the test more robust by polling memory.stat for the "sock "
counter and allowing it some time to drop to zero instead of checking
it only once. The timeout is set to 3 seconds to cover the periodic
rstat flush interval (FLUSH_TIME = 2*HZ by default) plus some
scheduling slack. If the counter does not become zero within the
timeout, the test still fails as before.
On my test system, running test_memcontrol 50 times produced:
- Before this patch: 6/50 runs passed.
- After this patch: 50/50 runs passed.
Suggested-by: Lance Yang <lance.yang(a)linux.dev>
Signed-off-by: Guopeng Zhang <zhangguopeng(a)kylinos.cn>
---
v2:
- Mention the periodic rstat flush interval (FLUSH_TIME = 2*HZ) in
the comment and clarify the rationale for the 3s timeout.
- Replace the hard-coded retry count and wait interval with macros
to avoid magic numbers and make the 3s timeout calculation explicit.
---
.../selftests/cgroup/test_memcontrol.c | 30 ++++++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index 4e1647568c5b..7bea656658a2 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -24,6 +24,9 @@
static bool has_localevents;
static bool has_recursiveprot;
+#define MEMCG_SOCKSTAT_WAIT_RETRIES 30 /* 3s total */
+#define MEMCG_SOCKSTAT_WAIT_INTERVAL_US (100 * 1000) /* 100 ms */
+
int get_temp_fd(void)
{
return open(".", O_TMPFILE | O_RDWR | O_EXCL);
@@ -1384,6 +1387,8 @@ static int test_memcg_sock(const char *root)
int bind_retries = 5, ret = KSFT_FAIL, pid, err;
unsigned short port;
char *memcg;
+ long sock_post = -1;
+ int i;
memcg = cg_name(root, "memcg_test");
if (!memcg)
@@ -1432,7 +1437,30 @@ static int test_memcg_sock(const char *root)
if (cg_read_long(memcg, "memory.current") < 0)
goto cleanup;
- if (cg_read_key_long(memcg, "memory.stat", "sock "))
+ /*
+ * memory.stat is updated asynchronously via the memcg rstat
+ * flushing worker, which runs periodically (every 2 seconds,
+ * see FLUSH_TIME). On a busy system, the "sock " counter may
+ * stay non-zero for a short period of time after the TCP
+ * connection is closed and all socket memory has been
+ * uncharged.
+ *
+ * Poll memory.stat for up to 3 seconds (~FLUSH_TIME plus some
+ * scheduling slack) and require that the "sock " counter
+ * eventually drops to zero.
+ */
+ for (i = 0; i < MEMCG_SOCKSTAT_WAIT_RETRIES; i++) {
+ sock_post = cg_read_key_long(memcg, "memory.stat", "sock ");
+ if (sock_post < 0)
+ goto cleanup;
+
+ if (!sock_post)
+ break;
+
+ usleep(MEMCG_SOCKSTAT_WAIT_INTERVAL_US);
+ }
+
+ if (sock_post)
goto cleanup;
ret = KSFT_PASS;
--
2.25.1
test_memcg_sock() currently requires that memory.stat's "sock " counter
is exactly zero immediately after the TCP server exits. On a busy system
this assumption is too strict:
- Socket memory may be freed with a small delay (e.g. RCU callbacks).
- memcg statistics are updated asynchronously via the rstat flushing
worker, so the "sock " value in memory.stat can stay non-zero for a
short period of time even after all socket memory has been uncharged.
As a result, test_memcg_sock() can intermittently fail even though socket
memory accounting is working correctly.
Make the test more robust by polling memory.stat for the "sock " counter
and allowing it some time to drop to zero instead of checking it only
once. If the counter does not become zero within the timeout, the test
still fails as before.
On my test system, running test_memcontrol 50 times produced:
- Before this patch: 6/50 runs passed.
- After this patch: 50/50 runs passed.
Signed-off-by: Guopeng Zhang <zhangguopeng(a)kylinos.cn>
---
.../selftests/cgroup/test_memcontrol.c | 24 ++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index 4e1647568c5b..86d9981cddd8 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -1384,6 +1384,8 @@ static int test_memcg_sock(const char *root)
int bind_retries = 5, ret = KSFT_FAIL, pid, err;
unsigned short port;
char *memcg;
+ long sock_post = -1;
+ int i, retries = 30;
memcg = cg_name(root, "memcg_test");
if (!memcg)
@@ -1432,7 +1434,27 @@ static int test_memcg_sock(const char *root)
if (cg_read_long(memcg, "memory.current") < 0)
goto cleanup;
- if (cg_read_key_long(memcg, "memory.stat", "sock "))
+ /*
+ * memory.stat is updated asynchronously via the memcg rstat
+ * flushing worker, so the "sock " counter may stay non-zero
+ * for a short period of time after the TCP connection is
+ * closed and all socket memory has been uncharged.
+ *
+ * Poll memory.stat for up to 3 seconds and require that the
+ * "sock " counter eventually drops to zero.
+ */
+ for (i = 0; i < retries; i++) {
+ sock_post = cg_read_key_long(memcg, "memory.stat", "sock ");
+ if (sock_post < 0)
+ goto cleanup;
+
+ if (!sock_post)
+ break;
+
+ usleep(100 * 1000); /* 100ms */
+ }
+
+ if (sock_post)
goto cleanup;
ret = KSFT_PASS;
--
2.25.1