linux-kernel - [PATCH kselftest-next 2/2] kselftests: memcg: speed up the memory.high test

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Message-ID: <20191202234212.4134802-2-guro@fb.com>
Date:   Mon, 2 Dec 2019 15:42:12 -0800
From:   Roman Gushchin <guro@...com>
To:     <linux-kselftest@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <kernel-team@...com>,
        Roman Gushchin <guro@...com>,
        Chris Down <chris@...isdown.name>,
        Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH kselftest-next 2/2] kselftests: memcg: speed up the memory.high test

After commit 0e4b01df8659 ("mm, memcg: throttle allocators when
failing reclaim over memory.high") allocating memory over memory.high
became very time consuming. But it's exactly what the memory.high
test from cgroup kselftests is doing: it tries to allocate 100M with
30M memory.high value. It takes forever to complete.

In order to keep it passing (or failing) in a reasonable amount of
time let's try to allocate only a little over 30M: 31M to be precise.

With this change test_memcontrol finishes in a reasonable amount of
time:
  $ time ./test_memcontrol
  ok 1 test_memcg_subtree_control
  ok 2 test_memcg_current
  ok 3 test_memcg_min
  ok 4 test_memcg_low
  ok 5 test_memcg_high
  ok 6 test_memcg_max
  ok 7 test_memcg_oom_events
  ok 8 test_memcg_swap_max
  ok 9 test_memcg_sock
  ok 10 test_memcg_oom_group_leaf_events
  ok 11 test_memcg_oom_group_parent_events
  ok 12 test_memcg_oom_group_score_events

  real	0m2.273s
  user	0m0.064s
  sys	0m0.739s

Signed-off-by: Roman Gushchin <guro@...com>
Cc: Chris Down <chris@...isdown.name>
Cc: Johannes Weiner <hannes@...xchg.org>
---
 tools/testing/selftests/cgroup/test_memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index 60bfe53c0289..739fa90448f6 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -606,7 +606,7 @@ static int test_memcg_high(const char *root)
 	if (cg_write(memcg, "memory.high", "30M"))
 		goto cleanup;
 
-	if (cg_run(memcg, alloc_anon, (void *)MB(100)))
+	if (cg_run(memcg, alloc_anon, (void *)MB(31)))
 		goto cleanup;
 
 	if (!cg_run(memcg, alloc_pagecache_50M_check, NULL))
-- 
2.17.1