Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753801AbdCPSev (ORCPT ); Thu, 16 Mar 2017 14:34:51 -0400 Received: from gum.cmpxchg.org ([85.214.110.215]:40674 "EHLO gum.cmpxchg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753505AbdCPSer (ORCPT ); Thu, 16 Mar 2017 14:34:47 -0400 Date: Thu, 16 Mar 2017 14:34:22 -0400 From: Johannes Weiner To: Vlastimil Babka Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mel Gorman , Joonsoo Kim , David Rientjes , kernel-team@fb.com Subject: Re: [PATCH v3 0/8] try to reduce fragmenting fallbacks Message-ID: <20170316183422.GA1461@cmpxchg.org> References: <20170307131545.28577-1-vbabka@suse.cz> <20170308164631.GA12130@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.7.2 (2016-11-26) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1318 Lines: 37 On Wed, Mar 08, 2017 at 08:17:39PM +0100, Vlastimil Babka wrote: > On 8.3.2017 17:46, Johannes Weiner wrote: > > Is there any other data you would like me to gather? > > If you can enable the extfrag tracepoint, it would be nice to have graphs of how > unmovable allocations falling back to movable pageblocks, etc. Okay, here we go. I recorded 24 hours worth of the extfrag tracepoint, filtered to fallbacks from unmovable requests to movable blocks. I've uploaded the plot here: http://cmpxchg.org/antifrag/fallbackrate.png but this already speaks for itself: 11G alloc-mtfallback.trace 3.3G alloc-mtfallback-patched.trace ;) > Possibly also /proc/pagetypeinfo for numbers of pageblock types. After a week of uptime, the patched (b) kernel has more movable blocks than vanilla 4.10-rc8 (a): Number of blocks type Unmovable Movable Reclaimable HighAtomic CMA Isolate a: Node 1, zone Normal 2017 29763 987 1 0 0 b: Node 1, zone Normal 1264 30850 653 1 0 0 I sampled this somewhat sporadically over the week and it's been reading reliably this way. The patched kernel also consistently beats vanilla in terms of peak job throughput. Overall very cool!