Simon wrote:
> > Would it make sense, Simon, to recommend to Andrew that
> > he take the simple patch I submitted yesterday ...
> >
> > Then, when we understand ... offer up a second patch?
>
> Of course !
Ok - I'll resubmit that patch. Hopefully you can reply to that
resubmitted patch with an "Acked-by: ..."
Andrew withdrew the original patch, when it became a matter needing
further discussion.
> My point is only that if you think there is a scaling problem in
> taking cpuset_sem for each call to cpuset_exit(), that scaling problem
> won't disappear by taking cpuset_sem only for 'notify_on_remove' cpusets,
Yes - that is a good and valid point.
I also lack any real evidence of a scaling problem. It's just a
theoretical concern. My unreliable weather forecast is that it will be
a while before it's a serious concern.
This means I am willing to take simple measures to minimize the concern,
but I'd prefer to await hard evidence of the problem before trying more
ambitious measures.
==
My impression is that cpusets has two classes of users:
1) Extreme HPC apps, scaling to hundreds or thousands of CPUs, and
2) More mixed or service oriented apps, with less extreme scaling.
I also suspect that it is the second class that most requires
notify_on_release. The extreme HPC guys have less need for
notify_on_release.
So I find a solution that lets one trade off extreme scaling versus
heavier use of notify_on_release to be appealing, if it can be done
trivially, as this patch does.
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <[email protected]> 1.650.933.1373, 1.925.600.0401
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