linux-kernel - Re: [PATCH] mm, oom: remove 'prefer children over parent' heuristic

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Message-Id: <201901210123.x0L1NLFJ043029@www262.sakura.ne.jp>
Date:   Mon, 21 Jan 2019 10:23:21 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH] mm, oom: remove 'prefer children over parent' heuristic

Shakeel Butt wrote:
> +	pr_err("%s: Kill process %d (%s) score %lu or sacrifice child\n",
> +		message, task_pid_nr(p), p->comm, oc->chosen_points);

This patch is to make "or sacrifice child" false. And, the process reported
by this line will become always same with the process reported by

	pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n",
		task_pid_nr(victim), victim->comm, K(victim->mm->total_vm),
		K(get_mm_counter(victim->mm, MM_ANONPAGES)),
		K(get_mm_counter(victim->mm, MM_FILEPAGES)),
		K(get_mm_counter(victim->mm, MM_SHMEMPAGES)));

. Then, better to merge these pr_err() lines?