| | Subject | Re: [PATCH v3 00/21] mm: lru_lock splitting | | From | Tim Chen <> | | Date | Fri, 24 Feb 2012 16:05:53 -0800 |
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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.
Tim
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