Re: [PATCH 2/2] sched: Rewrite per entity runnable load average tracking

[Yuyang Du <yuyang.du@intel.com>]

On Thu, Jul 10, 2014 at 12:08:59PM +0200, Peter Zijlstra wrote:
> 
> Since clock_task is the regular clock minus some local amount, the
> difference between two regular clock reads is always a strict upper
> bound on clock_task differences.
> 
This is inspiring. Regarding the clock source in load avg tracking,
should we simply use rq_clock_task instead of cfs_rq_clock_task.

For the bandwidth control case, just update/increase the last_update_time when
unthrottled by this throttled time, so the time would look like freezed. Am I
understanding right?

Not sure how much bandwidth control is used, but even not used, every time
we read cfs_rq_clock_task, will burn useless cycles here.

Thanks,
Yuyang