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SubjectRe: [x86/entry] 8c5045f89b: will-it-scale.per_process_ops -12.9% regression
On Fri, Mar 27, 2020 at 03:40:02PM +0800, kernel test robot wrote:
> Greeting,
> FYI, we noticed a -12.9% regression of will-it-scale.per_process_ops due to commit:
> commit: 8c5045f89b181a4412b698cafc9dc257192a3a65 ("x86/entry: Enable random_kstack_offset support")
> kspp/stack/offset/agnostic/v1
> in testcase: will-it-scale
> on test machine: 288 threads Intel(R) Xeon Phi(TM) CPU 7295 @ 1.50GHz with 80G memory
> with following parameters:
> nr_task: 100%
> mode: process
> test: lseek1
> cpufreq_governor: performance
> ucode: 0x11
> test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two.
> test-url:

Whoa. I'll take a closer look. I fail to understand how this could be
happening. In this CONFIG the changes are a NOP. And that would be
true for both process and thread. O_o

Kees Cook

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