From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 15 Aug 2001 19:34:37 -0300 (BRST) From: Rik van Riel Subject: Re: 0-order allocation problem In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Linus Torvalds Cc: Marcelo Tosatti , Hugh Dickins , linux-mm@kvack.org List-ID: On Wed, 15 Aug 2001, Linus Torvalds wrote: > On Wed, 15 Aug 2001, Marcelo Tosatti wrote: > > > > __GFP_IO is not going to help us that much on anon intensive workloads > > (eg swapoff). Remember we are _never_ going to block on buffer_head's of > > on flight swap pages because we can't see them in page_launder(). (if a > > page is locked, we simply skip it) > > Note that that is what we have the page_alloc (and buffer head) > reserves for - and it doesn't take that much to get the ball rolling. > Certainly not even close to our low-water-marks.. And once it > snowballs it _does_ help that people call page_launder(). Also, page_launder() tends to "strip" the buffer heads from pages as soon as they get cleaned, making them immediately available to the process trying to allocate a buffer head and calling page_launder() from buffer.c regards, Rik -- IA64: a worthy successor to i860. http://www.surriel.com/ http://distro.conectiva.com/ Send all your spam to aardvark@nl.linux.org (spam digging piggy) -- 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/