From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with SMTP id 632AE6B003D for ; Wed, 4 Feb 2009 15:14:33 -0500 (EST) Received: from localhost (smtp.ultrahosting.com [127.0.0.1]) by smtp.ultrahosting.com (Postfix) with ESMTP id 3FA5E82C522 for ; Wed, 4 Feb 2009 15:17:06 -0500 (EST) Received: from smtp.ultrahosting.com ([74.213.175.254]) by localhost (smtp.ultrahosting.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CNOuWPwKbOvR for ; Wed, 4 Feb 2009 15:17:06 -0500 (EST) Received: from qirst.com (unknown [74.213.171.31]) by smtp.ultrahosting.com (Postfix) with ESMTP id 4688982C523 for ; Wed, 4 Feb 2009 15:17:00 -0500 (EST) Date: Wed, 4 Feb 2009 15:09:15 -0500 (EST) From: Christoph Lameter Subject: Re: [patch] SLQB slab allocator In-Reply-To: <200902041522.01307.nickpiggin@yahoo.com.au> Message-ID: References: <20090114155923.GC1616@wotan.suse.de> <84144f020902031042i31eaec14v53a0e7a203acd28b@mail.gmail.com> <84144f020902031047o2e117652w28886efb495688c4@mail.gmail.com> <200902041522.01307.nickpiggin@yahoo.com.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Nick Piggin Cc: Pekka Enberg , Nick Piggin , "Zhang, Yanmin" , Lin Ming , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , Linus Torvalds List-ID: On Wed, 4 Feb 2009, Nick Piggin wrote: > That's very true, and we touched on this earlier. It is I guess > you can say a downside of queueing. But an analogous situation > in SLUB would be that lots of pages on the partial list with > very few free objects, or freeing objects to pages with few > objects in them. Basically SLUB will have to do the extra work > in the fastpath. But these are pages with mostly allocated objects and just a few objects free. The SLAB case is far worse: You have N objects on a queue and they are keeping possibly N pages away from the page allocator and in those pages *nothing* is used. -- 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