From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761422AbXGKFTP (ORCPT ); Wed, 11 Jul 2007 01:19:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758679AbXGKFTE (ORCPT ); Wed, 11 Jul 2007 01:19:04 -0400 Received: from smtp105.mail.mud.yahoo.com ([209.191.85.215]:28999 "HELO smtp105.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1757963AbXGKFTC (ORCPT ); Wed, 11 Jul 2007 01:19:02 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:X-YMail-OSG:Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=L/meW7EboFj0aYpyLFnqw6tDCb1yvqI5kKDtWHhOADzp2rjoAf7VQH2p6HPNO9ePYilPei2IMBcfbRYNkrvQGJcpSJcSISw+dyUEPolLl682mZXeR5Aa8339zxnioQCmgp0xUJm6FdAA3i8SLJEi9zfLvRikMqKJ0U2kPZqGCfU= ; X-YMail-OSG: yoWo1foVM1mFy_ZD3w_juYUI1fz3r8a5P3i71fpcTv.G5wx.l0PimYkTW4oMB1ieh.WeAUfpSA-- Message-ID: <4694683B.3060705@yahoo.com.au> Date: Wed, 11 Jul 2007 15:18:51 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 X-Accept-Language: en MIME-Version: 1.0 To: Matthew Hawkins CC: Andrew Morton , Con Kolivas , ck list , Ingo Molnar , Paul Jackson , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [ck] Re: -mm merge plans for 2.6.23 References: <20070710013152.ef2cd200.akpm@linux-foundation.org> <200707102015.44004.kernel@kolivas.org> <20070710181419.6d1b2f7e.akpm@linux-foundation.org> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Matthew Hawkins wrote: > On 7/11/07, Andrew Morton wrote: > Anyhow with swap prefetch, applications that may have been sitting > there idle for a while become responsive in the single-digit seconds > rather than double-digit or worse. The same goes for a morning wakeup > (ie after nightly cron jobs throw things out) OK that's a good data point. It would be really good to be able to do an analysis on your overnight IO patterns and the corresponding memory reclaim behaviour and see why things are getting evicted. Not that swap prefetching isn't a good solution for this situation, but the fact that things are getting swapped out for you also means that mapped files and possibly important pagecache and dentries are being flushed out, which we might be able to avoid. Thanks, Nick -- SUSE Labs, Novell Inc. From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4694683B.3060705@yahoo.com.au> Date: Wed, 11 Jul 2007 15:18:51 +1000 From: Nick Piggin MIME-Version: 1.0 Subject: Re: [ck] Re: -mm merge plans for 2.6.23 References: <20070710013152.ef2cd200.akpm@linux-foundation.org> <200707102015.44004.kernel@kolivas.org> <20070710181419.6d1b2f7e.akpm@linux-foundation.org> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Matthew Hawkins Cc: Andrew Morton , Con Kolivas , ck list , Ingo Molnar , Paul Jackson , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: Matthew Hawkins wrote: > On 7/11/07, Andrew Morton wrote: > Anyhow with swap prefetch, applications that may have been sitting > there idle for a while become responsive in the single-digit seconds > rather than double-digit or worse. The same goes for a morning wakeup > (ie after nightly cron jobs throw things out) OK that's a good data point. It would be really good to be able to do an analysis on your overnight IO patterns and the corresponding memory reclaim behaviour and see why things are getting evicted. Not that swap prefetching isn't a good solution for this situation, but the fact that things are getting swapped out for you also means that mapped files and possibly important pagecache and dentries are being flushed out, which we might be able to avoid. Thanks, Nick -- SUSE Labs, Novell Inc. -- 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