From: Tejun Heo Subject: Re: [PATCH 2/2] ext4: implement cgroup writeback support Date: Wed, 23 Sep 2015 13:57:23 -0400 Message-ID: <20150923175723.GC26647@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> <1443016253.19983.230.camel@gmail.com> <20150923170238.GG3318@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Artem Bityutskiy , 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 To: Theodore Ts'o Return-path: Content-Disposition: inline In-Reply-To: <20150923170238.GG3318@thunk.org> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Hello, Ted. On Wed, Sep 23, 2015 at 01:02:38PM -0400, Theodore Ts'o wrote: > Also note this performance regression reported by Dexuan Cui > > https://lkml.org/lkml/2015/9/23/333 > > I didn't notice these problems since I my userspace doesn't enable the > writeback cgroup. (In fact I don't know how to do it using Debian > Jessie.) The thing is I don't think they're either. > Tejun, can you please take a look at this and give me a > recommendation? I'm willing to wait a day or two while we try to fix > the problem, but past that point I'd like to have a fix or revert this > commit before Linus releases the next -rc release. Yeap, looking at them both. Will update as soon as I know more. Thanks. -- tejun