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Date: Thu, 10 Feb 2022 22:49:16 -0800
From: Shakeel Butt <shakeelb@...gle.com>
To: Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...e.com>, Roman Gushchin <guro@...com>
Cc: Chris Down <chris@...isdown.name>,
Andrew Morton <akpm@...ux-foundation.org>,
cgroups@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Shakeel Butt <shakeelb@...gle.com>
Subject: [PATCH v2 3/4] selftests: memcg: test high limit for single entry allocation
Test the enforcement of memory.high limit for large amount of memory
allocation within a single kernel entry. There are valid use-cases
where the application can trigger large amount of memory allocation
within a single syscall e.g. mlock() or mmap(MAP_POPULATE). Make sure
memory.high limit enforcement works for such use-cases.
Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
---
Changes since v1:
- None
tools/testing/selftests/cgroup/cgroup_util.c | 15 +++-
tools/testing/selftests/cgroup/cgroup_util.h | 1 +
.../selftests/cgroup/test_memcontrol.c | 78 +++++++++++++++++++
3 files changed, 91 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
index 0cf7e90c0052..dbaa7aabbb4a 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -583,7 +583,7 @@ int clone_into_cgroup_run_wait(const char *cgroup)
return 0;
}
-int cg_prepare_for_wait(const char *cgroup)
+static int __prepare_for_wait(const char *cgroup, const char *filename)
{
int fd, ret = -1;
@@ -591,8 +591,7 @@ int cg_prepare_for_wait(const char *cgroup)
if (fd == -1)
return fd;
- ret = inotify_add_watch(fd, cg_control(cgroup, "cgroup.events"),
- IN_MODIFY);
+ ret = inotify_add_watch(fd, cg_control(cgroup, filename), IN_MODIFY);
if (ret == -1) {
close(fd);
fd = -1;
@@ -601,6 +600,16 @@ int cg_prepare_for_wait(const char *cgroup)
return fd;
}
+int cg_prepare_for_wait(const char *cgroup)
+{
+ return __prepare_for_wait(cgroup, "cgroup.events");
+}
+
+int memcg_prepare_for_wait(const char *cgroup)
+{
+ return __prepare_for_wait(cgroup, "memory.events");
+}
+
int cg_wait_for(int fd)
{
int ret = -1;
diff --git a/tools/testing/selftests/cgroup/cgroup_util.h b/tools/testing/selftests/cgroup/cgroup_util.h
index 4f66d10626d2..628738532ac9 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.h
+++ b/tools/testing/selftests/cgroup/cgroup_util.h
@@ -55,4 +55,5 @@ extern int clone_reap(pid_t pid, int options);
extern int clone_into_cgroup_run_wait(const char *cgroup);
extern int dirfd_open_opath(const char *dir);
extern int cg_prepare_for_wait(const char *cgroup);
+extern int memcg_prepare_for_wait(const char *cgroup);
extern int cg_wait_for(int fd);
diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index c19a97dd02d4..36ccf2322e21 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -16,6 +16,7 @@
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
+#include <sys/mman.h>
#include "../kselftest.h"
#include "cgroup_util.h"
@@ -628,6 +629,82 @@ static int test_memcg_high(const char *root)
return ret;
}
+static int alloc_anon_mlock(const char *cgroup, void *arg)
+{
+ size_t size = (size_t)arg;
+ void *buf;
+
+ buf = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON,
+ 0, 0);
+ if (buf == MAP_FAILED)
+ return -1;
+
+ mlock(buf, size);
+ munmap(buf, size);
+ return 0;
+}
+
+/*
+ * This test checks that memory.high is able to throttle big single shot
+ * allocation i.e. large allocation within one kernel entry.
+ */
+static int test_memcg_high_sync(const char *root)
+{
+ int ret = KSFT_FAIL, pid, fd = -1;
+ char *memcg;
+ long pre_high, pre_max;
+ long post_high, post_max;
+
+ memcg = cg_name(root, "memcg_test");
+ if (!memcg)
+ goto cleanup;
+
+ if (cg_create(memcg))
+ goto cleanup;
+
+ pre_high = cg_read_key_long(memcg, "memory.events", "high ");
+ pre_max = cg_read_key_long(memcg, "memory.events", "max ");
+ if (pre_high < 0 || pre_max < 0)
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.high", "30M"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.max", "140M"))
+ goto cleanup;
+
+ fd = memcg_prepare_for_wait(memcg);
+ if (fd < 0)
+ goto cleanup;
+
+ pid = cg_run_nowait(memcg, alloc_anon_mlock, (void *)MB(200));
+ if (pid < 0)
+ goto cleanup;
+
+ cg_wait_for(fd);
+
+ post_high = cg_read_key_long(memcg, "memory.events", "high ");
+ post_max = cg_read_key_long(memcg, "memory.events", "max ");
+ if (post_high < 0 || post_max < 0)
+ goto cleanup;
+
+ if (pre_high == post_high || pre_max != post_max)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (fd >= 0)
+ close(fd);
+ cg_destroy(memcg);
+ free(memcg);
+
+ return ret;
+}
+
/*
* This test checks that memory.max limits the amount of
* memory which can be consumed by either anonymous memory
@@ -1180,6 +1257,7 @@ struct memcg_test {
T(test_memcg_min),
T(test_memcg_low),
T(test_memcg_high),
+ T(test_memcg_high_sync),
T(test_memcg_max),
T(test_memcg_oom_events),
T(test_memcg_swap_max),
--
2.35.1.265.g69c8d7142f-goog
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