From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758855AbZAWP5W (ORCPT ); Fri, 23 Jan 2009 10:57:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753452AbZAWP5C (ORCPT ); Fri, 23 Jan 2009 10:57:02 -0500 Received: from smtp.ultrahosting.com ([74.213.174.254]:56671 "EHLO smtp.ultrahosting.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754841AbZAWP5A (ORCPT ); Fri, 23 Jan 2009 10:57:00 -0500 Date: Fri, 23 Jan 2009 10:27:29 -0500 (EST) From: Christoph Lameter X-X-Sender: cl@qirst.com To: Nick Piggin cc: Pekka J Enberg , yanmin_zhang@linux.intel.com, Andi Kleen , Matthew Wilcox , linux-kernel@vger.kernel.org, akpm@linux-foundation.org Subject: Re: [PATCH] SLUB: revert direct page allocator pass through In-Reply-To: <200901240212.58829.nickpiggin@yahoo.com.au> Message-ID: References: <200901231952.53961.nickpiggin@yahoo.com.au> <200901240212.58829.nickpiggin@yahoo.com.au> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 24 Jan 2009, Nick Piggin wrote: > > I thought higher order allocations were not supposed to be used in > > performance critical paths? > > ? You use them all the time in SLUB alone. But SLUB compensates for the slow higher order allocs by using them as buffers for smaller objects.. The higher order allocs are in the slow paths. > > It seems that we currently need the slab allocators to compensate for the > > performance problems in the page allocator for these higher order allocs. > > I'd rather have the page allocator fixed but things are as they are. > > No objections from me with speeding up the page allocator of course. At least something we agree on. Gotta go. Next meeting and I still have not gotten through my email. Sigh.