Re: [PATCH v3 00/21] mm: lru_lock splitting

[Konstantin Khlebnikov]

Tim Chen wrote:
> On Thu, 2012-02-23 at 17:51 +0400, Konstantin Khlebnikov wrote:
> > v3 changes:
> > * inactive-ratio reworked again, now it always calculated from from scratch
> > * hierarchical pte reference bits filter in memory-cgroup reclaimer
> > * fixed two bugs in locking, found by Hugh Dickins
> > * locking functions slightly simplified
> > * new patch for isolated pages accounting
> > * new patch with lru interleaving
> >
> > This patchset is based on next-20120210
> >
> > git: https://github.com/koct9i/linux/commits/lruvec-v3
> >
> > ---
>
> I am seeing an improvement of about 7% in throughput in a workload where
> I am doing parallel reading of files that are mmaped. The contention on
> lru_lock used to be 13% in the cpu profile on the __pagevec_lru_add code
> path. Now lock contention on this path drops to about 0.6%.  I have 40
> hyper-threaded enabled cpu cores running 80 mmaped file reading
> processes.
>
> So initial testing of this patch set looks encouraging.

That's great!

> Tim

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