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

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Message-ID: <20120409200336.8368.63793.stgit@zurg>
Date:	Tue, 10 Apr 2012 00:03:36 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	Markus Trippelsdorf <markus@...ppelsdorf.de>
Subject: [PATCH] mm: sync rss-counters at the end of exit_mm()

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.

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>
---
 kernel/exit.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/exit.c b/kernel/exit.c
index d8bd3b42..8e09dbe 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -683,6 +683,7 @@ static void exit_mm(struct task_struct * tsk)
 	enter_lazy_tlb(mm, current);
 	task_unlock(tsk);
 	mm_update_next_owner(mm);
+	sync_mm_rss(mm);
 	mmput(mm);
 }
 

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