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Date: Tue, 17 Mar 2009 18:10:49 +0100
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [aarcange@redhat.com: [PATCH] fork vs gup(-fast) fix]
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References: <1237007189.25062.91.camel@pasglop> <200903141620.45052.nickpiggin@yahoo.com.au> <20090316223612.4B2A.A69D9226@jp.fujitsu.com> <alpine.LFD.2.00.0903161739310.3082@localhost.localdomain> <20090317121900.GD20555@random.random> <alpine.LFD.2.00.0903170929180.3082@localhost.localdomain> <alpine.LFD.2.00.0903170950410.3082@localhost.localdomain>
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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Nick Piggin <nickpiggin@yahoo.com.au>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@elte.hu>, Nick Piggin <npiggin@novell.com>, Hugh Dickins <hugh@veritas.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, linux-mm@kvack.org
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On Tue, Mar 17, 2009 at 10:01:06AM -0700, Linus Torvalds wrote:
> That same swapout+swapin problem seems to lose the dirty bit on a O_DIRECT 

I think the dirty bit is set in dio_bio_complete (or
bio_check_pages_dirty for the aio case) so forcing the swapcache to be
written out again before the page can be freed.

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