From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 29 Nov 2006 20:17:28 -0800 (PST) From: Christoph Lameter Subject: Re: [RFC][PATCH 0/1] Node-based reclaim/migration In-Reply-To: <6599ad830611291631hd6d3e52y971c35708004db00@mail.gmail.com> Message-ID: References: <20061129030655.941148000@menage.corp.google.com> <20061130093105.d872c49d.kamezawa.hiroyu@jp.fujitsu.com> <6599ad830611291631hd6d3e52y971c35708004db00@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Paul Menage Cc: KAMEZAWA Hiroyuki , linux-mm@kvack.org, akpm@osdl.org List-ID: On Wed, 29 Nov 2006, Paul Menage wrote: > Hmm, isn't migration just analagous to swapping out and swapping back > in again, but without the actual swapping? That used to be the case in the beginning. Not anymore. The page is directly moved to the target. Migration via swap is no longer supported. > If what you describe is a problem, then wouldn't you have a problem if > you were doing migration on a particular mm structure, but it was > sharing pages with another mm? You do not have a problem as long as you hold a mmap_sem lock on any of the vmas in which the page appears. Kame and I discussed several approached on how to avoid the issue in the past but so far there was no need to resolve the issue. -- 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