Re: [PATCH v2 00/22] mm: lru_lock splitting

[Konstantin Khlebnikov]

Andi Kleen wrote:
> On Wed, Feb 22, 2012 at 09:11:32AM +0400, Konstantin Khlebnikov wrote:
> > Andi Kleen wrote:
> > > Konstantin Khlebnikov<khlebnikov@xxxxxxxxxx>   writes:
> > >
> > > Konstantin,
> > >
> > > > There complete patch-set with my lru_lock splitting
> > > > plus all related preparations and cleanups rebased to next-20120210
> > >
> > > On large systems we're also seeing lock contention on the lru_lock
> > > without using memcgs. Any thoughts how this could be extended for this
> > > situation too?
> >
> > We can split lru_lock by pfn-based interleaving.
> > After all these cleanups it is very easy. I already have patch for this.
>
> Cool. If you send it can try it out on a large system.

See last patch in v3 patchset in lkml or in
git: https://github.com/koct9i/linux/commits/lruvec-v3

> This would split the LRU by pfn too, correct?

Of course, I don't see any problems with splitting large zone into some
independent pages subsets. But all sub-pages in huge-page should be in one lru,
that's why I use pfn-based interleaving.

> -Andi

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