linux-kernel - Re: [PATCH 3/5] oom: Fix child process iteration properly

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Message-ID: <20100601192726.GA19120@redhat.com>
Date:	Tue, 1 Jun 2010 21:27:26 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH 3/5] oom: Fix child process iteration properly

On 06/01, KOSAKI Motohiro wrote:
>
> @@ -88,6 +88,7 @@ unsigned long badness(struct task_struct *p, unsigned long uptime)
>  {
>  	unsigned long points, cpu_time, run_time;
>  	struct task_struct *c;
> +	struct task_struct *t = p;

This initialization should be moved down to

> +	do {
> +		list_for_each_entry(c, &t->children, sibling) {
> +			child = find_lock_task_mm(c);
> +			if (child) {
> +				if (child->mm != p->mm)
> +					points += child->mm->total_vm/2 + 1;
> +				task_unlock(child);
> +			}
>  		}
> -	}
> +	} while_each_thread(p, t);

this loop. We have "p = find_lock_task_mm(p)" in between which can change p.

Apart from this, I think the whole series is nice.

Oleg.

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