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

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [RFC PATCH] qspinlock: Improve performance by reducing load instruction rollback
Date 2015-10-20 11:20 +0200
Message-ID <qlBfl-7L2-39@gated-at.bofh.it> (permalink)
References <ql8n0-7wA-19@gated-at.bofh.it> <qldwm-6s2-13@gated-at.bofh.it> <qlvjz-7ng-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, Oct 20, 2015 at 10:57:53AM +0800, Ling Ma 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 ?

Works just fine in userspace if you pin each thread to a cpu and ensure
there's nothing else running on the system.

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Thread

[RFC PATCH] qspinlock: Improve performance by reducing load instruction rollback ling.ma.program@gmail.com - 2015-10-19 04:30 +0200
  Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ingo Molnar <mingo@kernel.org> - 2015-10-19 10:00 +0200
    Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Peter Zijlstra <peterz@infradead.org> - 2015-10-19 11:40 +0200
      Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ingo Molnar <mingo@kernel.org> - 2015-10-19 13:30 +0200
        Re: [RFC PATCH] qspinlock: Improve performance by reducing load instruction  rollback Waiman Long <waiman.long@hpe.com> - 2015-10-19 19:30 +0200
    Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ling Ma <ling.ma.program@gmail.com> - 2015-10-20 05:00 +0200
      Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ingo Molnar <mingo@kernel.org> - 2015-10-20 10:50 +0200
        Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ling Ma <ling.ma.program@gmail.com> - 2015-10-21 07:30 +0200
      Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Peter Zijlstra <peterz@infradead.org> - 2015-10-20 11:20 +0200
  Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Peter Zijlstra <peterz@infradead.org> - 2015-10-19 11:40 +0200
    Re: [RFC PATCH] qspinlock: Improve performance by reducing load instruction  rollback Waiman Long <waiman.long@hpe.com> - 2015-10-19 19:30 +0200
    Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ling Ma <ling.ma.program@gmail.com> - 2015-10-20 05:10 +0200
  Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Peter Zijlstra <peterz@infradead.org> - 2015-10-19 11:50 +0200
    Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ling Ma <ling.ma.program@gmail.com> - 2015-10-20 05:10 +0200
    Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ling Ma <ling.ma.program@gmail.com> - 2015-10-20 05:30 +0200
      Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Peter Zijlstra <peterz@infradead.org> - 2015-10-20 11:20 +0200
        Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ling Ma <ling.ma.program@gmail.com> - 2015-10-21 07:40 +0200
  Re: [RFC PATCH] qspinlock: Improve performance by reducing load instruction  rollback Waiman Long <waiman.long@hpe.com> - 2015-10-19 19:20 +0200
    Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ling Ma <ling.ma.program@gmail.com> - 2015-10-20 05:20 +0200
      Re: [RFC PATCH] qspinlock: Improve performance by reducing load instruction  rollback Waiman Long <waiman.long@hpe.com> - 2015-10-20 21:00 +0200
        Re: [RFC PATCH] qspinlock: Improve performance by reducing load  instruction rollback Ling Ma <ling.ma.program@gmail.com> - 2015-10-21 07:50 +0200

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