linux-kernel - Re: [PATCH] exit: fix oops in sync_mm

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Message-ID: <z2z28c262361003301948h64378b8bkbbd29ed810862ce5@mail.gmail.com>
Date:	Wed, 31 Mar 2010 11:48:20 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, cl@...ux-foundation.org,
	lee.schermerhorn@...com, rientjes@...gle.com,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"David S. Miller" <davem@...emloft.net>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Troels Liebe Bentsen <tlb@...anden.dk>,
	linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH] exit: fix oops in sync_mm_rss

On Wed, Mar 31, 2010 at 11:12 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Wed, 31 Mar 2010 10:57:18 +0900
> Minchan Kim <minchan.kim@...il.com> wrote:
>
>> On Wed, Mar 31, 2010 at 9:41 AM, KAMEZAWA Hiroyuki
>
>> > Doesn't make sense ?
>> >
>>
>> Nitpick.
>> How about moving sync_mm_rss into after check !mm of exit_mm?
>>
> Hmm.
> ==
>        sync_mm_rss(tsk, tsk->mm);
>        group_dead = atomic_dec_and_test(&tsk->signal->live);
>        if (group_dead) {
>                hrtimer_cancel(&tsk->signal->real_timer);
>                exit_itimers(tsk->signal);
>                if (tsk->mm)
>                        setmax_mm_hiwater_rss(&tsk->signal->maxrss, tsk->mm); ---(**)
>        }
>        acct_collect(code, group_dead);
>        if (group_dead)
>                tty_audit_exit();
>        if (unlikely(tsk->audit_context))
>                audit_free(tsk);
>
>        tsk->exit_code = code;
>        taskstats_exit(tsk, group_dead); --------(*)
>
>        exit_mm(tsk);
> ==
> task_acct routine has to handle mm information (*).

Indeed. I missed that.
Thanks, Kame.


-- 
Kind regards,
Minchan Kim
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