linux-ext4 - Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

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Message-ID: <20150924204736.GG25415@mtj.duckdns.org>
Date:	Thu, 24 Sep 2015 16:47:36 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	"dedekind1@...il.com" <dedekind1@...il.com>,
	Theodore Ts'o <tytso@....edu>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"kernel-team@...com" <kernel-team@...com>,
	"adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable
 cgroup writeback on traditional hierarchies

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 <decui@...rosoft.com>

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
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