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Date:   Fri, 2 Dec 2022 09:50:26 +0100
From:   Michal Hocko <mhocko@suse.com>
To:     kernel test robot <yujie.liu@intel.com>
Cc:     Shakeel Butt <shakeelb@google.com>, oe-lkp@lists.linux.dev,
        lkp@intel.com, Andrew Morton <akpm@linux-foundation.org>,
        kernel test robot <oliver.sang@intel.com>,
        Soheil Hassas Yeganeh <soheil@google.com>,
        Feng Tang <feng.tang@intel.com>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Muchun Song <songmuchun@bytedance.com>,
        Eric Dumazet <edumazet@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal =?iso-8859-1?Q?Koutn=FD?= <mkoutny@suse.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH] kselftests: cgroup: update kmem test precision tolerance
Message-ID: <Y4m8Unt6FhWKC6IH@dhcp22.suse.cz>
References: <202212010958.c1053bd3-yujie.liu@intel.com>
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OK, so this is a full patch to fix this
--- 
From 7f338ed952ba4a100822004bc8399bf720b42899 Mon Sep 17 00:00:00 2001
From: Michal Hocko <mhocko@suse.com>
Date: Fri, 2 Dec 2022 09:45:29 +0100
Subject: [PATCH] kselftests: cgroup: update kmem test precision tolerance

1813e51eece0 ("memcg: increase MEMCG_CHARGE_BATCH to 64") has changed
the batch size while this test case has been left behind. This has led
to a test failure reported by test bot:
not ok 2 selftests: cgroup: test_kmem # exit=1

Update the tolerance for the pcp charges to reflect the
MEMCG_CHARGE_BATCH change to fix this.

Reported-by: kernel test robot <yujie.liu@intel.com>
Link: https://lore.kernel.org/oe-lkp/202212010958.c1053bd3-yujie.liu@intel.com
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 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 22b31ebb3513..1d073e28254b 100644
--- a/tools/testing/selftests/cgroup/test_kmem.c
+++ b/tools/testing/selftests/cgroup/test_kmem.c
@@ -24,7 +24,7 @@
  * the maximum discrepancy between charge and vmstat entries is number
  * of cpus multiplied by 32 pages.
  */
-#define MAX_VMSTAT_ERROR (4096 * 32 * get_nprocs())
+#define MAX_VMSTAT_ERROR (4096 * 64 * get_nprocs())
 
 
 static int alloc_dcache(const char *cgroup, void *arg)
-- 
2.30.2

-- 
Michal Hocko
SUSE Labs