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 ESMTP id 3E90B6B0169 for ; Tue, 2 Aug 2011 16:02:12 -0400 (EDT) Received: from wpaz9.hot.corp.google.com (wpaz9.hot.corp.google.com [172.24.198.73]) by smtp-out.google.com with ESMTP id p72K29FL022925 for ; Tue, 2 Aug 2011 13:02:09 -0700 Received: from pzk37 (pzk37.prod.google.com [10.243.19.165]) by wpaz9.hot.corp.google.com with ESMTP id p72K25Jw016853 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=NOT) for ; Tue, 2 Aug 2011 13:02:08 -0700 Received: by pzk37 with SMTP id 37so190071pzk.29 for ; Tue, 02 Aug 2011 13:02:05 -0700 (PDT) Date: Tue, 2 Aug 2011 13:02:03 -0700 (PDT) From: David Rientjes Subject: Re: [GIT PULL] Lockless SLUB slowpaths for v3.1-rc1 In-Reply-To: Message-ID: References: <1312145146.24862.97.camel@jaguar> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Lameter Cc: Pekka Enberg , Linus Torvalds , Andrew Morton , hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org On Tue, 2 Aug 2011, Christoph Lameter wrote: > The per cpu partial lists only add the need for more memory if other > processors have to allocate new pages because they do not have enough > partial slab pages to satisfy their needs. That can be tuned by a cap on > objects. > The netperf benchmark isn't representative of a heavy slab consuming workload, I routinely run jobs on these machines that use 20 times the amount of slab. From what I saw in the earlier posting of the per-cpu partial list patch, the min_partial value is set to half of what it was previously as a per-node partial list. Since these are 16-core, 4 node systems, that would mean that after a kmem_cache_shrink() on a cache that leaves empty slab on the partial lists that we've doubled the memory for slub's partial lists systemwide. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org