linux-kernel - Re: [PATCH 3/3] writeback, blkio: add documentation for cgroup writeback support

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Message-ID: <20150616215436.GE22637@mtj.duckdns.org>
Date:	Tue, 16 Jun 2015 17:54:36 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Theodore Ts'o <tytso@....edu>, Vivek Goyal <vgoyal@...hat.com>,
	axboe@...nel.dk, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, lizefan@...wei.com,
	cgroups@...r.kernel.org
Subject: Re: [PATCH 3/3] writeback, blkio: add documentation for cgroup
 writeback support

Hello, Ted.

On Mon, Jun 15, 2015 at 07:35:19PM -0400, Theodore Ts'o wrote:
> So if there is some way we can signal to any cgroup that that might be
> throttling writeback or disk I/O that the jbd/jbd2 process should be
> considered privileged, that would be a good since it would allow us to
> avoid a potential priority inversion problem. 

I see.  In the long term, I think we might need to come up with a way
to overcharge a slower cgroup to avoid blocking faster ones for cases
where some IOs are depended upon by more than one cgroups.  That'd
take quite a bit of work from blkcg side.  Will think more about it.

Thanks.

-- 
tejun
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