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    SubjectRe: [PATCH 0/4] per anon_vma lock and turn anon_vma rwsem lock to rwlock_t
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    On Mon, 2013-11-04 at 17:44 -0800, Tim Chen wrote:
    > On Mon, 2013-11-04 at 11:59 +0800, Yuanhan Liu wrote:
    > > On Fri, Nov 01, 2013 at 08:15:13PM -0700, Davidlohr Bueso wrote:
    > > > On Fri, 2013-11-01 at 18:16 +0800, Yuanhan Liu wrote:
    > > > > On Fri, Nov 01, 2013 at 09:21:46AM +0100, Ingo Molnar wrote:
    > > > > >
    > > > > > * Yuanhan Liu <yuanhan.liu@linux.intel.com> wrote:
    > > > > >
    > > > > > > > Btw., another _really_ interesting comparison would be against
    > > > > > > > the latest rwsem patches. Mind doing such a comparison?
    > > > > > >
    > > > > > > Sure. Where can I get it? Are they on some git tree?
    > > > > >
    > > > > > I've Cc:-ed Tim Chen who might be able to point you to the latest
    > > > > > version.
    > > > > >
    > > > > > The last on-lkml submission was in this thread:
    > > > > >
    > > > > > Subject: [PATCH v8 0/9] rwsem performance optimizations
    > > > > >
    > > > >
    > > > > Thanks.
    > > > >
    > > > > I queued bunchs of tests about one hour ago, and already got some
    > > > > results(If necessary, I can add more data tomorrow when those tests are
    > > > > finished):
    > > >
    > > > What kind of system are you using to run these workloads on?
    > >
    > > I queued jobs on 5 testboxes:
    > > - brickland1: 120 core Ivybridge server
    > > - lkp-ib03: 48 core Ivybridge server
    > > - lkp-sb03: 32 core Sandybridge server
    > > - lkp-nex04: 64 core NHM server
    > > - lkp-a04: Atom server
    > > >
    > > > >
    > > > >
    > > > > v3.12-rc7 fe001e3de090e179f95d
    > > > > ------------------------ ------------------------
    > > > > -9.3% brickland1/micro/aim7/shared
    > > > > +4.3% lkp-ib03/micro/aim7/fork_test
    > > > > +2.2% lkp-ib03/micro/aim7/shared
    > > > > -2.6% TOTAL aim7.2000.jobs-per-min
    > > > >
    > > >
    > > > Sorry if I'm missing something, but could you elaborate more on what
    > > > these percentages represent?
    > >
    > > v3.12-rc7 fe001e3de090e179f95d
    > > ------------------------ ------------------------
    > > -9.3% brickland1/micro/aim7/shared
    > > ....
    > > ....
    > > -2.6% TOTAL aim7.2000.jobs-per-min
    > >
    > > The comparation base is v3.12-rc7, and we got 9.3 performance regression
    > > at commit fe001e3de090e179f95d, which is the head of rwsem performance
    > > optimizations patch set.
    >
    > Yunahan, thanks for the data. This I assume is with the entire rwsem
    > v8 patchset. Any idea of the run variation on the workload?

    Yunhan,

    I haven't got a chance to make multiple runs to check the standard
    deviation. From the few runs I did, I got a 5.1% increase in
    performance for aim7 shared workload for the complete rwsem patchset
    on a similar machine that you are using. The patches are applied
    to the 3.12-rc7 and compared to the vanilla kernel.

    Thanks.

    Tim



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