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 5BD7C6B0085 for ; Fri, 20 Mar 2009 11:29:47 -0400 (EDT) Received: from localhost (smtp.ultrahosting.com [127.0.0.1]) by smtp.ultrahosting.com (Postfix) with ESMTP id 667F982C9A2 for ; Fri, 20 Mar 2009 11:10:25 -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 AYu8XyuWqUpt for ; Fri, 20 Mar 2009 11:10:20 -0400 (EDT) Received: from qirst.com (unknown [74.213.171.31]) by smtp.ultrahosting.com (Postfix) with ESMTP id BD64A82C834 for ; Fri, 20 Mar 2009 11:10:20 -0400 (EDT) Date: Fri, 20 Mar 2009 11:00:42 -0400 (EDT) From: Christoph Lameter Subject: Re: [PATCH 00/25] Cleanup and optimise the page allocator V5 In-Reply-To: <1237543392-11797-1-git-send-email-mel@csn.ul.ie> Message-ID: References: <1237543392-11797-1-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 , KOSAKI Motohiro , Nick Piggin , Linux Kernel Mailing List , Lin Ming , Zhang Yanmin , Peter Zijlstra , Andrew Morton List-ID: On Fri, 20 Mar 2009, Mel Gorman wrote: > The lock contention on some machines goes up for the the zone->lru_lock > and zone->lock locks which can regress some workloads even though others on > the same machine still go faster. For netperf, a lock called slock-AF_INET > seemed very important although I didn't look too closely other than noting > contention went up. The zone->lock gets hammered a lot by high order allocs > and frees coming from SLUB which are not covered by the PCP allocator in > this patchset. zone->lru_lock goes up is less clear but as it's page cache > releases but overall contention may be up because CPUs are spending less > time with interrupts disabled and more time trying to do real work but > contending on the locks. We can tune SLUB to buffer more pages if the lru lock becomes too hot. -- 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