Re: [PATCH v10 6/7] sched: Provide runnable_load_avg back to cfs_rq

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

On Mon, Jul 27, 2015 at 11:21:15AM +0800, Boqun Feng wrote:
> Hi Yuyang,
> 
> On Mon, Jul 27, 2015 at 02:43:25AM +0800, Yuyang Du wrote:
> > Hi Boqun,
> > 
> > On Tue, Jul 21, 2015 at 06:29:56PM +0800, Boqun Feng wrote:
> > > The point is that you have already tracked the sum of runnable_load_avg
> > > and blocked_load_avg in cfs_rq->avg.load_avg. If you're going to track
> > > part of the sum, you'd better track the one that's updated less
> > > frequently, right?
> > > 
> > > Anyway, this idea just comes into my mind. I wonder which is udpated
> > > less frequently myself too. ;-) So I ask to see whether there is
> > > something we can improve.
> > 
> > Actually, this is not the point.
> > 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > 1) blocked load is more "difficult" to track, hint, migrate.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

> > 2) r(t1) - b(t2) is not anything, hint, t1 != t2
> 
> Please consider this patch below, which is not tested yet, just for
> discussion. This patch is based on 1-5 in your patchset and going to
> replace patch 6. Hope this could make my point clear.
> 
> Thanks anyway for being patient with me ;-)