From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id 59CB05F0001 for ; Tue, 14 Apr 2009 10:12:12 -0400 (EDT) Date: Tue, 14 Apr 2009 16:12:09 +0200 From: Andrea Arcangeli Subject: Re: [RFC][PATCH v3 1/6] mm: Don't unmap gup()ed page Message-ID: <20090414141209.GB31644@random.random> References: <20090414151204.C647.A69D9226@jp.fujitsu.com> <200904141925.46012.nickpiggin@yahoo.com.au> <2f11576a0904140502h295faf33qcea9a39ff7f230a5@mail.gmail.com> <200904142225.10788.nickpiggin@yahoo.com.au> <2f11576a0904140639l426e137ewdc46296cdb377dd@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2f11576a0904140639l426e137ewdc46296cdb377dd@mail.gmail.com> Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: Nick Piggin , LKML , Linus Torvalds , Andrew Morton , Jeff Moyer , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Hugh Dickins List-ID: 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org