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

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Date:	Thu, 24 Sep 2015 08:40:18 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	"dedekind1@...il.com" <dedekind1@...il.com>,
	Tejun Heo <tj@...nel.org>
CC:	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

> On Wed, 2015-09-23 at 17:07 -0400, Tejun Heo wrote:
> > Hello,
> >
> > So, this should make the regression go away.  It doesn't fix the
> > underlying bugs but they shouldn't get triggered by people not
> > experimenting with cgroup.
> 
> Tejun,
> 
> this hits the nail on the head and makes the problem go away.
> 
> I've tested the tip of Linuses tree (v4.3-rc2+) plus this patch - no
> data corruption after reboots.
> 
> I've tested just the tip of Linuses tree (v4.3-rc2+) without this
> patch, and I do see the data corruption after reboots.
> 
> Tested-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
> 
> Artem.

I can confirm the patch fixes my "slow write" issue too.

Tested-by: Dexuan Cui <decui@...rosoft.com>

-- Dexuan