Re: [Xen-devel] [PATCH v5 0/8] Memory scrubbing from idle loop

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 06/23/2017 05:36 AM, Jan Beulich wrote:
> > > > On 22.06.17 at 20:57, <boris.ostrovsky@xxxxxxxxxx> wrote:
> > Deferred:
> > * Per-node heap locks. In addition to (presumably) improving performance in
> >    general, once they are available we can parallelize scrubbing further by
> >    allowing more than one core per node to do idle loop scrubbing.
> I don't understand: A per-node lock still calls for just one CPU
> doing the scrubbing on that node, in order to not congest the
> lock.

Is this necessarily true? Maybe not allow all cores on a node to scrub 
but I'd think having more than one core do the work may be beneficial. 
Don't forget that actual scrubbing is performed without holding locks. 
We only grab the lock to find dirty buddies in the heap.

-boris



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