From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx138.postini.com [74.125.245.138]) by kanga.kvack.org (Postfix) with SMTP id 1992E6B0005 for ; Thu, 24 Jan 2013 20:47:15 -0500 (EST) Date: Fri, 25 Jan 2013 12:47:00 +1100 From: paul.szabo@sydney.edu.au Message-Id: <201301250147.r0P1l00t001070@como.maths.usyd.edu.au> Subject: Re: [PATCH] Negative (setpoint-dirty) in bdi_position_ratio() In-Reply-To: <20130125005529.GA21668@localhost> Sender: owner-linux-mm@kvack.org List-ID: To: fengguang.wu@intel.com Cc: 695182@bugs.debian.org, akpm@linux-foundation.org, jack@suse.cz, linux-kernel@vger.kernel.org, linux-mm@kvack.org Dear Fengguang, > There are 260MB reclaimable slab pages in the normal zone ... Marked "all_unreclaimable? yes": is that wrong? Question asked also in: http://marc.info/?l=linux-mm&m=135873981326767&w=2 > ... however we somehow failed to reclaim them. ... I made a patch that would do a drop_caches at that point, please see: http://bugs.debian.org/695182 http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=101;filename=drop_caches.patch;att=1;bug=695182 http://marc.info/?l=linux-mm&m=135785511125549&w=2 and that successfully avoided OOM when writing files. But, the drop_caches patch did not protect against the "sleep test". > ... What's your filesystem and the content of /proc/slabinfo? Filesystem is EXT3. See output of slabinfo in Debian bug above or in http://marc.info/?l=linux-mm&m=135796154427544&w=2 Thanks, Paul Paul Szabo psz@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia -- 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