From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id A720F6B0088 for ; Tue, 23 Nov 2010 03:38:30 -0500 (EST) Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e32.co.us.ibm.com (8.14.4/8.13.1) with ESMTP id oAN8T4pv032254 for ; Tue, 23 Nov 2010 01:29:04 -0700 Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.1) with ESMTP id oAN8cOHQ257986 for ; Tue, 23 Nov 2010 01:38:24 -0700 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id oAN8cOH7024848 for ; Tue, 23 Nov 2010 01:38:24 -0700 Subject: Re: Sudden and massive page cache eviction From: Dave Hansen In-Reply-To: <20101122161158.02699d10.akpm@linux-foundation.org> References: <20101122161158.02699d10.akpm@linux-foundation.org> Content-Type: text/plain; charset="ANSI_X3.4-1968" Date: Tue, 23 Nov 2010 00:38:22 -0800 Message-ID: <1290501502.2390.7029.camel@nimitz> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Andrew Morton Cc: Peter =?ISO-8859-1?Q?Sch=FCller?= , linux-kernel@vger.kernel.org, Mattias de Zalenski , linux-mm@kvack.org List-ID: On Mon, 2010-11-22 at 16:11 -0800, Andrew Morton wrote: > > This latest observation we understand may be due to NUMA related > > allocation issues, and we should probably try to use numactl to ask > > for a more even allocation. We have not yet tried this. However, it > is not clear how any issues having to do with that would cause sudden > > eviction of data already *in* the page cache (on whichever node). You don't have anybody messing with /proc/sys/vm/drop_caches, do you? That can cause massive, otherwise unprovoked page cache eviction. -- Dave -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org