linux-kernel - Re: [PATCH cgroup/for-4.4 3/3] cgroup: replace unified-hierarchy.txt with a proper cgroup v2 documentation

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Message-ID: <20151022143605.GE30579@mtj.duckdns.org>
Date:	Thu, 22 Oct 2015 23:36:05 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Li Zefan <lizefan@...wei.com>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Michal Hocko <mhocko@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Paul Turner <pjt@...gle.com>,
	kernel-team@...com
Subject: Re: [PATCH cgroup/for-4.4 3/3] cgroup: replace unified-hierarchy.txt
 with a proper cgroup v2 documentation

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
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