Re: [RFC PATCH] qspinlock: Improve performance by reducing load instruction rollback

[Ling Ma]

Ok, we will put the spinlock test into the perf bench.

Thanks
Ling

2015-10-20 16:48 GMT+08:00 Ingo Molnar <mingo@xxxxxxxxxx>:
>
> * Ling Ma <ling.ma.program@xxxxxxxxx> wrote:
>
>> > So it would be nice to create a new user-space spinlock testing facility, via
>> > a new 'perf bench spinlock' feature or so. That way others can test and
>> > validate your results on different hardware as well.
>>
>> Attached the spinlock test module . Queued spinlock will run very slowly in user
>> space because process switch context, it is OK for spinlock-test implementation
>> with kernel module ?
>
> Not sure what you mean by 'because process switch context': if you pin the test
> tasks to individual CPUs and make sure there's nothing else running it should be
> equivalent to kernel-space execution.
>
> Thanks,
>
>         Ingo
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