linux-kernel - Re: [RFC][PATCH v3 1/6] mm: Don't unmap gup()ed page

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Message-ID: <20090414141209.GB31644@random.random>
Date:	Tue, 14 Apr 2009 16:12:09 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, Jeff Moyer <jmoyer@...hat.com>,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [RFC][PATCH v3 1/6] mm: Don't unmap gup()ed page

On Tue, Apr 14, 2009 at 10:39:54PM +0900, KOSAKI Motohiro wrote:
> I guess you dislike get_user_page_fast() grab pte_lock too, right?

If get_user_page_fast is vetoed to run a set_bit on the already cache
hot and exclusive struct page, I doubt taking a potentially cache
cold, mm-wide or pmd-wide pte_lock is ok.
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