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SubjectRe: [PATCH v3 00/21] mm: lru_lock splitting
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:
> ---

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

So initial testing of this patch set looks encouraging.


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