From: Tejun Heo Subject: Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies Date: Thu, 24 Sep 2015 16:47:36 -0400 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 Cc: "dedekind1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" , Theodore Ts'o , "axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org" , "cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org" , "kernel-team-b10kYP2dOMg@public.gmane.org" , "adilger.kernel-m1MBpc4rdrD3fQ9qLvQP4Q@public.gmane.org" , "linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" To: Dexuan Cui Return-path: Content-Disposition: inline In-Reply-To: Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-ext4.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