From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 19 Jun 2007 12:22:33 -0700 (PDT) From: Christoph Lameter Subject: Re: [PATCH 0/7] Memory Compaction v2 In-Reply-To: <20070619165841.GG17109@skynet.ie> Message-ID: References: <20070618092821.7790.52015.sendpatchset@skynet.skynet.ie> <20070619165841.GG17109@skynet.ie> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Mel Gorman Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kamezawa.hiroyu@jp.fujitsu.com List-ID: On Tue, 19 Jun 2007, Mel Gorman wrote: > Agreed. When I put this together first, I felt I would be able to isolate > pages of different types on migratelist but that is not the case as migration > would not be able to tell the difference between a LRU page and a pagetable > page. I'll rename cc->migratelist to cc->migratelist_lru with the view to > potentially adding cc->migratelist_pagetable or cc->migratelist_slab later. Right. The particular issue with moving page table pages or slab pages is that you do not have a LRU. The page state needs to be established in a different way and there needs to be mechanism to ensure that the page is not currently being setup or torn down. For the slab pages I have relied on page->inuse > 0 to signify a page in use. I am not sure how one would realize that for page table pages. -- 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