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selftests: cgroup: fix test_kmem_memcg_deletion kernel mem check

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Currently, not all kernel memory usage is being accounted for. This
commit switches to using the kernel entry within memory.stat which
already includes kernel_stack, pagetables, and slab. The kernel entry
also includes vmalloc and other additional kernel memory use cases which
were missing.

Link: https://lkml.kernel.org/r/bvrhe2tpsts2azaroq4ubp2slawmop6orndsswrewuscw3ugvk@kmemmrttsnc7
Signed-off-by: Lucas Karpinski <lkarpins@redhat.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Zefan Li <lizefan.x@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Lucas Karpinski 2023-08-17 15:57:48 -04:00 committed by Andrew Morton
parent 004a9a38e2
commit 7131fd7e30
1 changed files with 7 additions and 14 deletions
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21
tools/testing/selftests/cgroup/test_kmem.c
View file

@ -162,11 +162,11 @@ static int cg_run_in_subcgroups(const char *parent,
* allocates some slab memory (mostly negative dentries) using 2 * NR_CPUS
* threads. Then it checks the sanity of numbers on the parent level:
* the total size of the cgroups should be roughly equal to
* anon + file + slab + kernel_stack.
* anon + file + kernel + sock.
*/
static int test_kmem_memcg_deletion(const char *root)
{
long current, slab, anon, file, kernel_stack, pagetables, percpu, sock, sum;
long current, anon, file, kernel, sock, sum;
int ret = KSFT_FAIL;
char *parent;
@ -184,29 +184,22 @@ static int test_kmem_memcg_deletion(const char *root)
goto cleanup;
current = cg_read_long(parent, "memory.current");
slab = cg_read_key_long(parent, "memory.stat", "slab ");
anon = cg_read_key_long(parent, "memory.stat", "anon ");
file = cg_read_key_long(parent, "memory.stat", "file ");
kernel_stack = cg_read_key_long(parent, "memory.stat", "kernel_stack ");
pagetables = cg_read_key_long(parent, "memory.stat", "pagetables ");
percpu = cg_read_key_long(parent, "memory.stat", "percpu ");
kernel = cg_read_key_long(parent, "memory.stat", "kernel ");
sock = cg_read_key_long(parent, "memory.stat", "sock ");
if (current < 0 || slab < 0 || anon < 0 || file < 0 ||
kernel_stack < 0 || pagetables < 0 || percpu < 0 || sock < 0)
if (current < 0 || anon < 0 || file < 0 || kernel < 0 || sock < 0)
goto cleanup;
sum = slab + anon + file + kernel_stack + pagetables + percpu + sock;
sum = anon + file + kernel + sock;
if (abs(sum - current) < MAX_VMSTAT_ERROR) {
ret = KSFT_PASS;
} else {
printf("memory.current = %ld\n", current);
printf("slab + anon + file + kernel_stack = %ld\n", sum);
printf("slab = %ld\n", slab);
printf("anon + file + kernel + sock = %ld\n", sum);
printf("anon = %ld\n", anon);
printf("file = %ld\n", file);
printf("kernel_stack = %ld\n", kernel_stack);
printf("pagetables = %ld\n", pagetables);
printf("percpu = %ld\n", percpu);
printf("kernel = %ld\n", kernel);
printf("sock = %ld\n", sock);
}