From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752593AbdBOV5D (ORCPT ); Wed, 15 Feb 2017 16:57:03 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:50542 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752350AbdBOV5B (ORCPT ); Wed, 15 Feb 2017 16:57:01 -0500 Date: Wed, 15 Feb 2017 13:56:54 -0800 From: Andrew Morton To: Mel Gorman Cc: Shantanu Goel , Chris Mason , Johannes Weiner , Vlastimil Babka , LKML , Linux-MM Subject: Re: [PATCH 0/3] Reduce amount of time kswapd sleeps prematurely Message-Id: <20170215135654.315cbdca1c403c90a74f1bdd@linux-foundation.org> In-Reply-To: <20170215212906.3myab4545wa2f3yc@techsingularity.net> References: <20170215092247.15989-1-mgorman@techsingularity.net> <20170215123055.b8041d7b6bdbcca9c5fd8dd9@linux-foundation.org> <20170215212906.3myab4545wa2f3yc@techsingularity.net> X-Mailer: Sylpheed 3.4.1 (GTK+ 2.24.23; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 15 Feb 2017 21:29:06 +0000 Mel Gorman wrote: > On Wed, Feb 15, 2017 at 12:30:55PM -0800, Andrew Morton wrote: > > On Wed, 15 Feb 2017 09:22:44 +0000 Mel Gorman wrote: > > > > > This patchset is based on mmots as of Feb 9th, 2016. The baseline is > > > important as there are a number of kswapd-related fixes in that tree and > > > a comparison against v4.10-rc7 would be almost meaningless as a result. > > > > It's very late to squeeze this into 4.10. We can make it 4.11 material > > and perhaps tag it for backporting into 4.10.1? > > It would be important that Johannes's patches go along with then because > I'm relied on Johannes' fixes to deal with pages being inappropriately > written back from reclaim context when I was analysing the workload. > I'm thinking specifically about these patches > > mm-vmscan-scan-dirty-pages-even-in-laptop-mode.patch > mm-vmscan-kick-flushers-when-we-encounter-dirty-pages-on-the-lru.patch > mm-vmscan-kick-flushers-when-we-encounter-dirty-pages-on-the-lru-fix.patch > mm-vmscan-remove-old-flusher-wakeup-from-direct-reclaim-path.patch > mm-vmscan-only-write-dirty-pages-that-the-scanner-has-seen-twice.patch > mm-vmscan-move-dirty-pages-out-of-the-way-until-theyre-flushed.patch > mm-vmscan-move-dirty-pages-out-of-the-way-until-theyre-flushed-fix.patch > > This is 4.11 material for sure but I would not automatically try merging > them to 4.10 unless those patches were also included, ideally with a rerun > of just those patches against 4.10 to make sure there are no surprises > lurking in there. Head spinning a bit. You're saying that if the three patches in the series "Reduce amount of time kswapd sleeps prematurely" are held off until 4.11 then the above 6 patches from Johannes should also be held off for 4.11?