From: Konstantin Khlebnikov <khlebnikov@openvz.org>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Hugh Dickins <hughd@google.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Markus Trippelsdorf <markus@trippelsdorf.de>
Subject: Re: [PATCH] mm: sync rss-counters at the end of exit_mm()
Date: Tue, 10 Apr 2012 09:43:12 +0400 [thread overview]
Message-ID: <4F83C870.2090100@openvz.org> (raw)
In-Reply-To: <4F838051.50101@jp.fujitsu.com>
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@openvz.org>
>> Reported-by: Markus Trippelsdorf<markus@trippelsdorf.de>
>> Cc: Hugh Dickins<hughd@google.com>
>> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@jp.fujitsu.com>
>
> Reviewed-by: KAMEZAWA Hiroyuki<kamezawa.hiroyu@jp.fujitsu.com>
>
> Does this fix recent issue reported ?
>
I hope so.
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next prev parent reply other threads:[~2012-04-10 5:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-09 20:03 [PATCH] mm: sync rss-counters at the end of exit_mm() Konstantin Khlebnikov
2012-04-09 21:04 ` KOSAKI Motohiro
2012-04-09 22:03 ` Hugh Dickins
2012-04-10 0:33 ` KAMEZAWA Hiroyuki
2012-04-10 6:34 ` Konstantin Khlebnikov
2012-04-10 16:04 ` Markus Trippelsdorf
2012-04-10 0:35 ` KAMEZAWA Hiroyuki
2012-04-10 5:43 ` Konstantin Khlebnikov [this message]
2012-04-10 17:07 ` [PATCH v2] mm: correctly synchronize rss-counters at exit/exec Konstantin Khlebnikov
2012-04-10 18:43 ` Andrew Morton
2012-04-10 19:52 ` Konstantin Khlebnikov
2012-04-10 19:10 ` Oleg Nesterov
2012-04-10 20:09 ` Konstantin Khlebnikov
2012-04-12 8:09 ` [PATCH 1/2] mm: set task exit code before complete_vfork_done() Konstantin Khlebnikov
2012-04-12 23:35 ` Andrew Morton
2012-04-12 23:54 ` Oleg Nesterov
2012-04-20 17:59 ` Oleg Nesterov
2012-04-20 19:23 ` Konstantin Khlebnikov
2012-04-20 20:41 ` Oleg Nesterov
2012-04-25 20:01 ` Andrew Morton
2012-04-12 8:09 ` [PATCH 2/2] mm: call complete_vfork_done() after clearing child_tid and flushing rss-counters Konstantin Khlebnikov
2012-04-12 23:39 ` Andrew Morton
2012-04-13 6:43 ` Konstantin Khlebnikov
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