linux-kernel - Re: [PATCH 3/3] staging: android: lowmemorykiller: Drop tasklist

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Message-ID: <20120130134601.GB14110@redhat.com>
Date:	Mon, 30 Jan 2012 14:46:01 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	San Mehat <san@...gle.com>, Colin Cross <ccross@...roid.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, kernel-team@...roid.com,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 3/3] staging: android: lowmemorykiller: Drop
	tasklist_lock usage

On 01/30, Anton Vorontsov wrote:
>
> @@ -132,8 +134,8 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
>  	}
>  	selected_oom_adj = min_adj;
>
> -	read_lock(&tasklist_lock);
> -	for_each_process(p) {
> +	for_each_tgid(ns, iter) {

This makes force_sig() below unsafe, it can race with the exiting task.

Oleg.

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