linux-kernel - [RFC PATCH] mm/oom_kill: allow oom kill allocating task for non-global case

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Message-Id: <20210607163103.632681-1-atomlin@redhat.com>
Date:   Mon,  7 Jun 2021 17:31:03 +0100
From:   Aaron Tomlin <atomlin@...hat.com>
To:     linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, vbabka@...e.cz, mhocko@...e.com,
        llong@...hat.com, linux-kernel@...r.kernel.org
Subject: [RFC PATCH] mm/oom_kill: allow oom kill allocating task for non-global case

At the present time, in the context of memcg OOM, even when
sysctl_oom_kill_allocating_task is enabled/or set, the "allocating"
task cannot be selected, as a target for the OOM killer.

This patch removes the restriction entirely.

Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
---
 mm/oom_kill.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index eefd3f5fde46..3bae33e2d9c2 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -1089,9 +1089,9 @@ bool out_of_memory(struct oom_control *oc)
 		oc->nodemask = NULL;
 	check_panic_on_oom(oc);
 
-	if (!is_memcg_oom(oc) && sysctl_oom_kill_allocating_task &&
-	    current->mm && !oom_unkillable_task(current) &&
-	    oom_cpuset_eligible(current, oc) &&
+	if (sysctl_oom_kill_allocating_task && current->mm &&
+            !oom_unkillable_task(current) &&
+            oom_cpuset_eligible(current, oc) &&
 	    current->signal->oom_score_adj != OOM_SCORE_ADJ_MIN) {
 		get_task_struct(current);
 		oc->chosen = current;
-- 
2.26.3