lkml.org 
[lkml]   [2017]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] mm, oom: allow oom reaper to race with exit_mmap
    On Tue 25-07-17 18:17:54, Kirill A. Shutemov wrote:
    > > before the patch
    > > min: 306300.00 max: 6731916.00 avg: 437962.07 std: 92898.30 nr: 100000
    > >
    > > after
    > > min: 303196.00 max: 5728080.00 avg: 436081.87 std: 96165.98 nr: 100000
    > >
    > > The results are well withing noise as I would expect.
    >
    > I've silightly modified your test case: replaced cpuid + rdtsc with
    > rdtscp. cpuid overhead is measurable in such tight loop.
    >
    > 3 runs before the patch:
    > Min. 1st Qu. Median Mean 3rd Qu. Max.
    > 177200 205000 212900 217800 223700 2377000
    > 172400 201700 209700 214300 220600 1343000
    > 175700 203800 212300 217100 223000 1061000
    >
    > 3 runs after the patch:
    > Min. 1st Qu. Median Mean 3rd Qu. Max.
    > 175900 204800 213000 216400 223600 1989000
    > 180300 210900 219600 223600 230200 3184000
    > 182100 212500 222000 226200 232700 1473000
    >
    > The difference is still measuarble. Around 3%.

    what is stdev?
    --
    Michal Hocko
    SUSE Labs

    \
     
     \ /
      Last update: 2017-07-25 17:23    [W:6.076 / U:1.852 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site