Re: [PATCH 1/4] sched: move IO scheduling accounting from io_schedule_timeout() to __schedule()

Tejun Heo
2016-12-06T21:31:08Z

Hello,

On Mon, Oct 31, 2016 at 10:45:56AM -0600, Tejun Heo wrote:
> Tracking the owners of mutexes and rwsems does help quite a bit. I
> don't think it's as simple as inheriting io sleep state from the
> current owner tho. The owner might be running or in a non-IO sleep
> when others try to grab the mutex. It is an option to ignore those
> cases but this would have a real possibility to lead to surprising
> results in some corner cases. If we choose to propagate dynamically,
> it becomes an a lot more complex problem and I don't think it'd be
> justfiable.
>
> Unless there can be a simple enough and reliable solution, I think
> it'd be better to stick with explicit marking.

Just posted the fixed version for the first patch. Any more thoughts
on this?

Thanks.

--
tejun