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SubjectRe: [lkp] [mm] 6f25a14a70: will-it-scale.scalability -4.0% regression
On 2016/4/7 9:06, kernel test robot wrote:

> FYI, we noticed that will-it-scale.scalability -4.0% regression on
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> commit 6f25a14a7053b69917e2ebea0d31dd444cd31fd5 ("mm: fix invalid node in alloc_migrate_target()")
>

alloc_migrate_target() is called from cma or mem-offline.
I have no idea what's the relation between these, any ideas?

Thanks,
Xishi Qiu

>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase:
> gcc-4.9/performance/x86_64-rhel/debian-x86_64-2015-02-07.cgz/lkp-ivb-d03/pthread_mutex1/will-it-scale
>
> commit:
> 969e8d7e47f93ef693028667480558de8f70523f
> 6f25a14a7053b69917e2ebea0d31dd444cd31fd5
>
> 969e8d7e47f93ef6 6f25a14a7053b69917e2ebea0d
> ---------------- --------------------------
> fail:runs %reproduction fail:runs
> %stddev %change %stddev
> \ | \
> 2.032e+08 ± 0% -1.6% 2e+08 ± 0% will-it-scale.per_process_ops
> 0.83 ± 0% -4.0% 0.79 ± 0% will-it-scale.scalability
> 214103 ± 14% -20.2% 170884 ± 14% sched_debug.cpu.ttwu_count.stddev
> 3789 ± 7% -10.3% 3398 ± 6% slabinfo.anon_vma_chain.active_objs
> 4660 ± 5% +7.7% 5019 ± 2% vmstat.system.in
>
>
> lkp-ivb-d03: Ivy Bridge
> Memory: 4G
>
>
>
> To reproduce:
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
> cd lkp-tests
> bin/lkp install job.yaml # job file is attached in this email
> bin/lkp run job.yaml
>
>
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
>
>
> Thanks,
> Xiaolong Ye



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