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

[Tejun Heo]

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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