From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 4 Apr 2007 20:38:52 -0700 (PDT) From: Christoph Lameter Subject: Re: [RFC] Free up page->private for compound pages In-Reply-To: <20070405033648.GG11192@wotan.suse.de> Message-ID: References: <20070405033648.GG11192@wotan.suse.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Nick Piggin Cc: linux-mm@kvack.org, dgc@sgi.com List-ID: On Thu, 5 Apr 2007, Nick Piggin wrote: > On Wed, Apr 04, 2007 at 08:19:22PM -0700, Christoph Lameter wrote: > > If we add a new flag so that we can distinguish between the > > first page and the tail pages then we can avoid to use page->private > > in the first page of a compound page. page->private == page for the first > > page, so there is no real information in there. > > Couldn't you use something like PageActive for the head page instead of > taking up a new flag, seeing as we don't put compound pages on the LRU? We could set up an alias for now? If we start supporting compound pages for filesystem then we will have these pages on the LRU. -- 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