Re: [REGRESSION 2.6.30][PATCH 1/1] sched: defer idle accountingtill after load update period

From: Peter Zijlstra
Date: Fri Apr 02 2010 - 04:01:20 EST

On Thu, 2010-04-01 at 22:18 +0200, Thomas Gleixner wrote:
> Well, the uninterruptible count imbalance is preventing us to calc the
> load avg per cpu, which is something the power saving folks are
> interested in.
> If that is fixed we probably have a good chance to collect the per cpu
> stuff and build a combined one - have not looked into the gory details
> of the math yet.

The problem with all this per-cpu loadavg is that it would require a
steady tick on each cpu to age this loadavg, which is quite in
contradiction with power savings as they rather like the nohz feature.

No idea yet on what to do about that.
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