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@redhat.com --- https://lore.kernel.org/all/m6jbt5hzq27ygt3l4xyiaxxb7i5auvb2lahbcj4yaxxigqzu... 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");