From: James Bottomley Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback related. Date: Tue, 10 May 2011 09:01:04 -0500 Message-ID: <1305036064.6737.8.camel@mulgrave.site> References: <20110428192104.GA4658@suse.de> <1304020767.2598.21.camel@mulgrave.site> <1304025145.2598.24.camel@mulgrave.site> <1304030629.2598.42.camel@mulgrave.site> <20110503091320.GA4542@novell.com> <1304431982.2576.5.camel@mulgrave.site> <1304432553.2576.10.camel@mulgrave.site> <20110506074224.GB6591@suse.de> <20110506080728.GC6591@suse.de> <1304964980.4865.53.camel@mulgrave.site> <20110510102141.GA4149@novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Mel Gorman , Jan Kara , colin.king@canonical.com, Chris Mason , linux-fsdevel , linux-mm , linux-kernel , linux-ext4 To: Mel Gorman Return-path: Received: from bedivere.hansenpartnership.com ([66.63.167.143]:60538 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932246Ab1EJOBI (ORCPT ); Tue, 10 May 2011 10:01:08 -0400 In-Reply-To: <20110510102141.GA4149@novell.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Tue, 2011-05-10 at 11:21 +0100, Mel Gorman wrote: > I really would like to hear if the fix makes a big difference or > if we need to consider forcing SLUB high-order allocations bailing > at the first sign of trouble (e.g. by masking out __GFP_WAIT in > allocate_slab). Even with the fix applied, kswapd might be waking up > less but processes will still be getting stalled in direct compaction > and direct reclaim so it would still be jittery. "the fix" being this https://lkml.org/lkml/2011/3/5/121 In addition to your GFP_KSWAPD one? OK, will retry with that. James