From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 15 May 2007 13:04:09 -0700 (PDT) From: Christoph Lameter Subject: Re: [PATCH 8/8] Mark page cache pages as __GFP_PAGECACHE instead of __GFP_MOVABLE In-Reply-To: <20070515195206.GA14028@skynet.ie> Message-ID: References: <20070515150311.16348.56826.sendpatchset@skynet.skynet.ie> <20070515150552.16348.15975.sendpatchset@skynet.skynet.ie> <20070515195206.GA14028@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 List-ID: On Tue, 15 May 2007, Mel Gorman wrote: > Currently page cache pages are grouped with MOVABLE allocations. This appears > to work well in practice as page cache pages are usually reclaimable via > the LRU. However, this is not strictly correct as page cache pages can only > be cleaned and discarded, not migrated. During readahead, pages may also > exist on a pool for a period of time instead of on the LRU giving them a > differnet lifecycle to ordinary movable pages. Sorry but pagecache pages can be migrated. -- 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