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From:   Vasily Averin <vvs@virtuozzo.com>
Subject: [PATCH memcg 1/3] mm: do not firce global OOM from inside dying tasks
To:     Michal Hocko <mhocko@kernel.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     Roman Gushchin <guro@fb.com>, Uladzislau Rezki <urezki@gmail.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Shakeel Butt <shakeelb@google.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        cgroups@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, kernel@openvz.org
References: <YW/WoJDFM3ddHn7Y@dhcp22.suse.cz>
 <cover.1634730787.git.vvs@virtuozzo.com>
Message-ID: <2c13c739-7282-e6f4-da0a-c0b69e68581e@virtuozzo.com>
Date:   Wed, 20 Oct 2021 15:12:19 +0300
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There is no sense to force global OOM if current task is dying.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
 mm/oom_kill.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 831340e7ad8b..1deef8c7a71b 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -1137,6 +1137,9 @@ void pagefault_out_of_memory(void)
 	if (mem_cgroup_oom_synchronize(true))
 		return;
 
+	if (fatal_signal_pending(current))
+		return;
+
 	if (!mutex_trylock(&oom_lock))
 		return;
 	out_of_memory(&oc);
-- 
2.32.0