Re: [Lsf] Preliminary Agenda and Activities for LSF

Dave Chinner
2011-03-30T04:18:07Z

On Tue, Mar 29, 2011 at 10:35:13AM -0700, Chad Talbott wrote:
> I'd like to propose a discussion topic:
>
> IO-less Dirty Throttling Considered Harmful...
>
> to isolation and cgroup IO schedulers in general.

Why is that, exactly? The current writeback infrastructure isn't
cgroup aware at all, so isn't that the problem you need to solve
first? i.e. how to delegate page cache writeback from
one context to anotheri and account for it correctly?

Once you solve that problem, triggering cgroup specific writeback
from the throttling code is the same regardless of whether we
are doing IO directly from the throttling code or via a separate
flusher thread. Hence I don't really understand why you think
IO-less throttling is really a problem.

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com