From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from zps76.corp.google.com (zps76.corp.google.com [172.25.146.76]) by smtp-out.google.com with ESMTP id kAUJ9RAs028172 for ; Thu, 30 Nov 2006 11:09:28 -0800 Received: from ug-out-1314.google.com (ugn78.prod.google.com [10.66.14.78]) by zps76.corp.google.com with ESMTP id kAUJ7wQM002865 for ; Thu, 30 Nov 2006 11:09:23 -0800 Received: by ug-out-1314.google.com with SMTP id 78so2120800ugn for ; Thu, 30 Nov 2006 11:09:23 -0800 (PST) Message-ID: <6599ad830611301109n8c4637ei338ecb4395c3702b@mail.gmail.com> Date: Thu, 30 Nov 2006 11:09:23 -0800 From: "Paul Menage" Subject: Re: [RFC][PATCH 0/1] Node-based reclaim/migration In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20061129030655.941148000@menage.corp.google.com> <20061130093105.d872c49d.kamezawa.hiroyu@jp.fujitsu.com> <6599ad830611291631hd6d3e52y971c35708004db00@mail.gmail.com> <6599ad830611300245s5c0f40bdu4231832930e9c023@mail.gmail.com> <20061130201232.7d5f5578.kamezawa.hiroyu@jp.fujitsu.com> <6599ad830611300325h3269a185x5794b0c585d985c0@mail.gmail.com> <6599ad830611301035u36a111dfye8c9414d257ebe07@mail.gmail.com> Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: KAMEZAWA Hiroyuki , linux-mm@kvack.org, akpm@osdl.org List-ID: On 11/30/06, Christoph Lameter wrote: > > F.e. A page cache page may have mapcount == 0. OK, I was thinking just about anon pages. For pagecache pages, it's safe to access the mapping as long as we've locked the page, even if mapcount is 0? So we don't have the same races? Paul -- 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