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Date: Thu, 22 Oct 2015 23:36:05 +0900
From: Tejun Heo <tj@kernel.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>, Li Zefan <lizefan@huawei.com>,
        cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
        Jens Axboe <axboe@kernel.dk>, Michal Hocko <mhocko@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>,
        Paul Turner <pjt@google.com>, kernel-team@fb.com
Subject: Re: [PATCH cgroup/for-4.4 3/3] cgroup: replace unified-hierarchy.txt
 with a proper cgroup v2 documentation
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On Thu, Oct 22, 2015 at 10:34:27AM -0400, Vivek Goyal wrote:
> On Thu, Oct 22, 2015 at 10:23:54AM +0900, Tejun Heo wrote:
> 
> [..]
> > +5-3-2. Writeback
> > +
> > +Writeback of page cache manages the dirty memory ratio and is an
> > +integral part of memory management.  The io controller, in conjunction
> > +with the memory controller, implements control of page cache writeback
> > +IOs.  The memory controller defines the memory domain that dirty
> > +memory ratio is calculated and maintained for and the io controller
> > +defines the io domain which writes out dirty pages for the memory
> > +domain.
> 
> Hi Tejun,
> 
> Glad that finally devel flag will go away and new shiny unified hierarchy
> can be used using cgroup2 fstype. Thanks for all this hard work.
> 
> Will it make sense to also talk about what filesystems currently writeback
> cgroup work with. IIUC, currently this works with ext2 and there are plans to
> make it work with other filesystems.

It works with ext2 and 4 and btrfs.  Will document it.  Thanks.

-- 
tejun