linux-kernel - [RFC patch] vm: clear swap entry before copying pte

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Date:	Fri, 27 Jul 2012 21:53:24 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: [RFC patch] vm: clear swap entry before copying pte

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@...il.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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