linux-kernel - [PATCH v2] selftests: cgroup: fix test_kmem

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Message-ID: <ix6vzgjqay2x7bskle7pypoint4nj66fwq7odvd5hektatvp2l@kukoifnfj3dr>
Date:   Thu, 3 Aug 2023 12:00:47 -0400
From:   Lucas Karpinski <lkarpins@...hat.com>
To:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     Muchun Song <muchun.song@...ux.dev>, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] selftests: cgroup: fix test_kmem_basic slab1 check

test_kmem_basic creates 100,000 negative dentries, with each one mapping
to a slab object. After memory.high is set, these are reclaimed through
the shrink_slab function call which reclaims all 100,000 entries. The
test passes the majority of the time because when slab1 is calculated,
it is often above 0, however, 0 is also an acceptable value.

Signed-off-by: Lucas Karpinski <lkarpins@...hat.com>
---
https://lore.kernel.org/all/m6jbt5hzq27ygt3l4xyiaxxb7i5auvb2lahbcj4yaxxigqzu5e@5rn6s2yjzv7u/
V2: Corrected title

 tools/testing/selftests/cgroup/test_kmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/cgroup/test_kmem.c b/tools/testing/selftests/cgroup/test_kmem.c
index 258ddc565deb..ba0a0bfc5a98 100644
--- a/tools/testing/selftests/cgroup/test_kmem.c
+++ b/tools/testing/selftests/cgroup/test_kmem.c
@@ -71,7 +71,7 @@ static int test_kmem_basic(const char *root)
 
 	cg_write(cg, "memory.high", "1M");
 	slab1 = cg_read_key_long(cg, "memory.stat", "slab ");
-	if (slab1 <= 0)
+	if (slab1 < 0)
 		goto cleanup;
 
 	current = cg_read_long(cg, "memory.current");
-- 
2.41.0