Re: [PATCH 10/13] x86: mm: Enable deferred struct page initialisation on x86-64

From: Mel Gorman
Date: Sat Apr 25 2015 - 13:29:14 EST

On Fri, Apr 24, 2015 at 03:04:27PM -0400, Waiman Long wrote:
> >>Within a NUMA node, however, we can split the
> >>memory initialization to 2 or more local CPUs if the memory size is
> >>big enough.
> >>
> >I considered it but discarded the idea. It'd be more complex to setup and
> >the two CPUs could simply end up contending on the same memory bus as
> >well as contending on zone->lock.
> >
> I don't think we need that now. However, we may have to consider
> this when one day even a single node can have TBs of memory unless
> we move to a page size larger than 4k.

We'll cross that bridge when we come to it. I suspect there is more room
for improvement in the initialisation that would be worth trying before
resorting to more threads. With more threads there is a risk that we hit
memory bus contention and a high risk that it actually is worse due to
contending on zone->lock when freeing the pages.

In the meantime, do you mind updating the before/after figures for your
test machine with this series please?

Mel Gorman
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