From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754060AbbIXUrn (ORCPT ); Thu, 24 Sep 2015 16:47:43 -0400 Received: from mail-yk0-f169.google.com ([209.85.160.169]:35626 "EHLO mail-yk0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752711AbbIXUrk (ORCPT ); Thu, 24 Sep 2015 16:47:40 -0400 Date: Thu, 24 Sep 2015 16:47:36 -0400 From: Tejun Heo To: Dexuan Cui Cc: "dedekind1@gmail.com" , "Theodore Ts'o" , "axboe@kernel.dk" , "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "lizefan@huawei.com" , "cgroups@vger.kernel.org" , "hannes@cmpxchg.org" , "kernel-team@fb.com" , "adilger.kernel@dilger.ca" , "linux-ext4@vger.kernel.org" Subject: Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies Message-ID: <20150924204736.GG25415@mtj.duckdns.org> References: <1434495193-31182-1-git-send-email-tj@kernel.org> <1434495193-31182-3-git-send-email-tj@kernel.org> <20150722035620.GD2944@thunk.org> <1443012552.19983.209.camel@gmail.com> <20150923180934.GE26647@mtj.duckdns.org> <20150923185137.GJ26647@mtj.duckdns.org> <20150923210729.GA23180@mtj.duckdns.org> <1443082186.19983.234.camel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Thu, Sep 24, 2015 at 08:40:18AM +0000, Dexuan Cui wrote: > I can confirm the patch fixes my "slow write" issue too. > > Tested-by: Dexuan Cui Yeah, this should make it go away w/o using cgroup writeback explicitly; however, I think the proper solution for cgroup writeback is moving bandwidth estimation from memory domain to io domain so that two separate bw estimations wouldn't interfere with each other leading to unexpected outcomes. I'll work on the changes. Thanks. -- tejun