From: Michal Hocko <mhocko@kernel.org>
Date: Fri, 7 Oct 2016 23:57:32 +0000 (-0700)
Subject: mm/oom_kill.c: fix task_will_free_mem() comment
X-Git-Tag: v4.9-rc1~73^2~112
X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=5870c2e1d78b043b69de3199469c056ca3b05102

mm/oom_kill.c: fix task_will_free_mem() comment

Attempt to demystify the task_will_free_mem() loop.

Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index ef175518f05f..463cdd22d4e0 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -803,8 +803,9 @@ static bool task_will_free_mem(struct task_struct *task)
 		return true;
 
 	/*
-	 * This is really pessimistic but we do not have any reliable way
-	 * to check that external processes share with our mm
+	 * Make sure that all tasks which share the mm with the given tasks
+	 * are dying as well to make sure that a) nobody pins its mm and
+	 * b) the task is also reapable by the oom reaper.
 	 */
 	rcu_read_lock();
 	for_each_process(p) {