Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756959AbXJCBmt (ORCPT ); Tue, 2 Oct 2007 21:42:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753269AbXJCBmn (ORCPT ); Tue, 2 Oct 2007 21:42:43 -0400 Received: from smtp107.mail.mud.yahoo.com ([209.191.85.217]:33144 "HELO smtp107.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753130AbXJCBmm (ORCPT ); Tue, 2 Oct 2007 21:42:42 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:X-YMail-OSG:From:To:Subject:Date:User-Agent:Cc:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id; b=OGWCZfXKuA30BA6jZip7IIG3WyaR/4w3BhVywMD+8+c2w9I1uR+Sm+sAx/w/+nwj90ZRSUD2GJHVEhnQEUtSvDEsPY3yLnEuqAE2I7Ywxc/pCM18ex8OTDqOnCVKAIlcAle7GWx7XJf4ezSbONlc85KdekL6xaPxdOCpbUtP/5c= ; X-YMail-OSG: mInxwREVM1nClYIFzyjeICY7dFLYt8sFiwg1maOtRLRhRbB1dH9HqJxrC3hMNGuwoqQARFDwIw-- From: Nick Piggin To: Hugh Dickins Subject: Re: kswapd min order, slub max order [was Re: -mm merge plans for 2.6.24] Date: Tue, 2 Oct 2007 19:10:58 +1000 User-Agent: KMail/1.9.5 Cc: Andrew Morton , Chritoph Lameter , Mel Gorman , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20071001142222.fcaa8d57.akpm@linux-foundation.org> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200710021910.58983.nickpiggin@yahoo.com.au> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1504 Lines: 35 On Wednesday 03 October 2007 02:06, Hugh Dickins wrote: > On Mon, 1 Oct 2007, Andrew Morton wrote: > > # > > # slub && antifrag > > # > > have-kswapd-keep-a-minimum-order-free-other-than-order-0.patch > > only-check-absolute-watermarks-for-alloc_high-and-alloc_harder-allocation > >s.patch slub-exploit-page-mobility-to-increase-allocation-order.patch > > slub-reduce-antifrag-max-order.patch > > > > I think this stuff is in the "mm stuff we don't want to merge" > > category. If so, I really should have dropped it ages ago. > > I agree. I spent a while last week bisecting down to see why my heavily > swapping loads take 30%-60% longer with -mm than mainline, and it was > here that they went bad. Trying to keep higher orders free is costly. Yeah, no there's no way we'd merge that. > On the other hand, hasn't SLUB efficiency been built on the expectation > that higher orders can be used? And it would be a twisted shame for > high performance to be held back by some idiot's swapping load. IMO it's a bad idea to create all these dependencies like this. If SLUB can get _more_ performance out of using higher order allocations, then fine. If it is starting off at a disadvantage at the same order, then it that should be fixed first, right? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/