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SubjectRe: [PATCH 4/4] sched: bias to target cpu load to reduce task moving

> We obsevered 150% performance gain with vm-scalability/300s-mmap-pread-seq
> testcase with this patch applied. Here is a list of changes we got so far:
>
> testbox : brickland

got some explain of brickland on wiki:
High-end server platform based on the Ivy Bridge-EX processor
> testcase: vm-scalability/300s-mmap-pread-seq

https://github.com/aristeu/vm-scalability

Thanks a lot for testing! :)
Do you have data of base upstream commit?

>
>
> f1b6442c7dd12802e622 d70495ef86f397816d73
> (parent commit) (this commit)
> ------------------------ ------------------------
> 26393249.80 +150.9% 66223933.60 vm-scalability.throughput
>
> 225.12 -49.9% 112.75 time.elapsed_time
> 36333.40 -90.7% 3392.20 vmstat.system.cs
> 2.40 +375.0% 11.40 vmstat.cpu.id
> 3770081.60 -97.7% 87673.40 time.major_page_faults
> 3975276.20 -97.0% 117409.60 time.voluntary_context_switches
> 3.05 +301.7% 12.24 iostat.cpu.idle
> 21118.41 -70.3% 6277.19 time.system_time
> 18.40 +130.4% 42.40 vmstat.cpu.us
> 77.00 -41.3% 45.20 vmstat.cpu.sy
> 47459.60 -31.3% 32592.20 vmstat.system.in
> 82435.40 -12.1% 72443.60 time.involuntary_context_switches
> 5128.13 +14.0% 5848.30 time.user_time
> 11656.20 -7.8% 10745.60 time.percent_of_cpu_this_job_got
> 1069997484.80 +0.3% 1073679919.00 time.minor_page_faults
>

--
Thanks
Alex


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