Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754730Ab0HCE2s (ORCPT ); Tue, 3 Aug 2010 00:28:48 -0400 Received: from mga01.intel.com ([192.55.52.88]:39451 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751074Ab0HCE2r (ORCPT ); Tue, 3 Aug 2010 00:28:47 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.55,307,1278313200"; d="scan'208";a="592299792" Date: Tue, 3 Aug 2010 12:28:35 +0800 From: Wu Fengguang To: Minchan Kim Cc: Chris Webb , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , KOSAKI Motohiro Subject: Re: Over-eager swapping Message-ID: <20100803042835.GA17377@localhost> References: <20100802124734.GI2486@arachsys.com> <20100803033108.GA23117@arachsys.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1323 Lines: 36 On Tue, Aug 03, 2010 at 12:09:18PM +0800, Minchan Kim wrote: > On Tue, Aug 3, 2010 at 12:31 PM, Chris Webb wrote: > > Minchan Kim writes: > > > >> Another possibility is _zone_reclaim_ in NUMA. > >> Your working set has many anonymous page. > >> > >> The zone_reclaim set priority to ZONE_RECLAIM_PRIORITY. > >> It can make reclaim mode to lumpy so it can page out anon pages. > >> > >> Could you show me /proc/sys/vm/[zone_reclaim_mode/min_unmapped_ratio] ? > > > > Sure, no problem. On the machine with the /proc/meminfo I showed earlier, > > these are > > > >  # cat /proc/sys/vm/zone_reclaim_mode > >  0 > >  # cat /proc/sys/vm/min_unmapped_ratio > >  1 > > if zone_reclaim_mode is zero, it doesn't swap out anon_pages. If there are lots of order-1 or higher allocations, anonymous pages will be randomly evicted, regardless of their LRU ages. This is probably another factor why the users claim. Are there easy ways to confirm this other than patching the kernel? Chris, what's in your /proc/slabinfo? Thanks, Fengguang -- 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/