Re: [Lsf] Preliminary Agenda and Activities for LSF

Vivek Goyal
2011-03-29T19:09:27Z

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...
>

I see that writeback has extended session at 10.00. I am assuming
IO less throttling will be discussed there. Is it possible to
discuss its effect on block cgroups there? I am not sure enough
time is there because it ties in memory cgroup also.

Or there is a session at 12.30 "memcg dirty limits and writeback", it
can probably be discussed there too.

> to isolation and cgroup IO schedulers in general. The disk scheduler
> is knocked out of the picture unless it can see the IO generated by
> each group above it. The world of memcg-aware writeback stacked on
> top of block-cgroups is a complicated one. Throttling in
> balance_dirty_pages() will likely be a non-starter for current users
> of group-aware CFQ.

Can't a single flusher thread keep all the groups busy/full on slow
SATA device.

Thanks
Vivek