From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id E36E66B0047 for ; Mon, 16 Mar 2009 12:35:55 -0400 (EDT) Received: from localhost (smtp.ultrahosting.com [127.0.0.1]) by smtp.ultrahosting.com (Postfix) with ESMTP id 34CE382D376 for ; Mon, 16 Mar 2009 12:42:37 -0400 (EDT) Received: from smtp.ultrahosting.com ([74.213.174.254]) by localhost (smtp.ultrahosting.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SGmuKGfn26pO for ; Mon, 16 Mar 2009 12:42:31 -0400 (EDT) Received: from qirst.com (unknown [74.213.171.31]) by smtp.ultrahosting.com (Postfix) with ESMTP id B189182D2C7 for ; Mon, 16 Mar 2009 12:40:05 -0400 (EDT) Date: Mon, 16 Mar 2009 12:31:44 -0400 (EDT) From: Christoph Lameter Subject: Re: [PATCH 30/35] Skip the PCP list search by counting the order and type of pages on list In-Reply-To: <1237196790-7268-31-git-send-email-mel@csn.ul.ie> Message-ID: References: <1237196790-7268-1-git-send-email-mel@csn.ul.ie> <1237196790-7268-31-git-send-email-mel@csn.ul.ie> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: Linux Memory Management List , Pekka Enberg , Rik van Riel , KOSAKI Motohiro , Johannes Weiner , Nick Piggin , Linux Kernel Mailing List , Lin Ming , Zhang Yanmin , Peter Zijlstra List-ID: On Mon, 16 Mar 2009, Mel Gorman wrote: > > struct per_cpu_pages { > - int count; /* number of pages in the list */ > + /* The total number of pages on the PCP lists */ > + int count; > + > + /* Count of each migratetype and order */ > + u8 mocount[MIGRATE_PCPTYPES][PAGE_ALLOC_COSTLY_ORDER+1]; What about overflow? You could have more than 255 pages of a given type in a pcp. -- 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