From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f72.google.com (mail-wm0-f72.google.com [74.125.82.72]) by kanga.kvack.org (Postfix) with ESMTP id 273376B0069 for ; Fri, 9 Sep 2016 05:59:38 -0400 (EDT) Received: by mail-wm0-f72.google.com with SMTP id g141so10389596wmd.0 for ; Fri, 09 Sep 2016 02:59:38 -0700 (PDT) Received: from outbound-smtp06.blacknight.com (outbound-smtp06.blacknight.com. [81.17.249.39]) by mx.google.com with ESMTPS id b75si2225517wma.30.2016.09.09.02.59.36 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 09 Sep 2016 02:59:36 -0700 (PDT) Received: from mail.blacknight.com (pemlinmail01.blacknight.ie [81.17.254.10]) by outbound-smtp06.blacknight.com (Postfix) with ESMTPS id 3FE38989CE for ; Fri, 9 Sep 2016 09:59:36 +0000 (UTC) From: Mel Gorman Subject: [RFC PATCH 0/4] Reduce tree_lock contention during swap and reclaim of a single file v1 Date: Fri, 9 Sep 2016 10:59:31 +0100 Message-Id: <1473415175-20807-1-git-send-email-mgorman@techsingularity.net> Sender: owner-linux-mm@kvack.org List-ID: To: LKML , Linux-MM , Mel Gorman Cc: Dave Chinner , Linus Torvalds , Ying Huang , Michal Hocko This is a follow-on series from the thread "[lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression" with active parties cc'd. I've pushed the series to git.kernel.org where the LKP robot should pick it up automatically. git://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git mm-reclaim-contention-v1r15 The progression of this series has been unsatisfactory. Dave originally reported a problem with tree_lock contention and while it can be fixed by pushing reclaim to direct reclaim, it slows swap considerably and was not a universal win. This series is the best balance I've found so far between the swapping and large rewriter cases. I never reliably produced the same contentions that Dave did so testing is needed. Dave, ideally you would test patches 1+2 and patches 1+4 but a test of patches 1+3 would also be nice if you have the time. Minimally, I'm expected that patches 1+2 will help the swapping-to-fast-storage case (LKP to confirm independently) and may be worth considering on their own even if Dave's test case is not helped. drivers/block/brd.c | 1 + mm/vmscan.c | 209 +++++++++++++++++++++++++++++++++++++++++++++------- 2 files changed, 182 insertions(+), 28 deletions(-) -- 2.6.4 -- 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