From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753626AbcIIJ7k (ORCPT ); Fri, 9 Sep 2016 05:59:40 -0400 Received: from outbound-smtp04.blacknight.com ([81.17.249.35]:38986 "EHLO outbound-smtp04.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751091AbcIIJ7i (ORCPT ); Fri, 9 Sep 2016 05:59:38 -0400 From: Mel Gorman To: LKML , Linux-MM , Mel Gorman Cc: Dave Chinner , Linus Torvalds , Ying Huang , Michal Hocko 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> X-Mailer: git-send-email 2.6.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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