From: Hillf Danton <dhillf@gmail.com>
To: Hugh Dickins <hughd@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Mel Gorman <mgorman@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: [RFC patch] vm: clear swap entry before copying pte
Date: Fri, 27 Jul 2012 21:53:24 +0800 [thread overview]
Message-ID: <CAJd=RBDQ1J9UTWOK1x6XNYunFz36RsMnr1Om9HsQQ_Kp8P7RKQ@mail.gmail.com> (raw)
If swap entry is cleared, we can see the reason that copying pte is
interrupted. If due to page table lock held long enough, no need to
increase swap count.
Signed-off-by: Hillf Danton <dhillf@gmail.com>
---
--- a/mm/memory.c Fri Jul 27 21:33:32 2012
+++ b/mm/memory.c Fri Jul 27 21:35:24 2012
@@ -971,6 +971,7 @@ again:
if (add_swap_count_continuation(entry, GFP_KERNEL) < 0)
return -ENOMEM;
progress = 0;
+ entry.val = 0;
}
if (addr != end)
goto again;
--
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next reply other threads:[~2012-07-27 13:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-27 13:53 Hillf Danton [this message]
2012-07-31 2:34 ` Hugh Dickins
2012-07-31 12:32 ` Hillf Danton
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