linux-kernel - Re: [PATCH] mm: sync rss-counters at the end of exit

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Date:	Tue, 10 Apr 2012 09:43:12 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Hugh Dickins <hughd@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>
Subject: Re: [PATCH] mm: sync rss-counters at the end of exit_mm()

KAMEZAWA Hiroyuki wrote:
> (2012/04/10 5:03), Konstantin Khlebnikov wrote:
>
>> On task's exit do_exit() calls sync_mm_rss() but this is not enough,
>> there can be page-faults after this point, for example exit_mm() ->
>> mm_release() ->  put_user() (for processing tsk->clear_child_tid).
>> Thus there may be some rss-counters delta in current->rss_stat.

I had to mention it in comment:

This should fix warnings:
BUG: Bad rss-counter state mm:ffff88020813c380 idx:1 val:-1
BUG: Bad rss-counter state mm:ffff88020813c380 idx:2 val:1

>>
>> Signed-off-by: Konstantin Khlebnikov<khlebnikov@...nvz.org>
>> Reported-by: Markus Trippelsdorf<markus@...ppelsdorf.de>
>> Cc: Hugh Dickins<hughd@...gle.com>
>> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
>
> Reviewed-by: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
>
> Does this fix recent issue reported ?
>

I hope so.
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