Messages in this thread | | | Date | Wed, 27 Jan 2016 15:44:22 +0100 | From | Peter Zijlstra <> | Subject | Re: [RFC 8/8] Do not reclaim the whole CPU bandwidth |
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On Tue, Jan 26, 2016 at 01:52:19PM +0100, luca abeni wrote:
> > The trouble is with interfaces. Once we expose them we're stuck with > > them. And from that POV I think an explicit SCHED_OTHER server (or a > > minimum budget for a slack time scheme) makes more sense.
> I am trying to work on this. > Which kind of interface is better for this? Would adding something like > /proc/sys/kernel/sched_other_period_us > /proc/sys/kernel/sched_other_runtime_us > be ok? > > If this is ok, I'll add these two procfs files, and store > (sched_other_runtime / sched_other_period) << 20 in the runqueue field > which represents the unreclaimable utilization (implementing > hierarchical SCHED_DEADLINE/CFS scheduling right now is too complex for > this patchset... But if the exported interface is ok, it can be > implemented later). > > Is this approach acceptable? Or am I misunderstanding your comment?
No, I think that's fine.
Altough now you have me worrying about per root_domain settings and the like. But I think we can do that with additional interfaces, if needed.
So yes, please go with that.
And agreed, a full CFS server is a bit outside scope for this patch-set.
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