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Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression
Date 2015-09-04 10:00 +0200
Message-ID <q4U4G-4eq-13@gated-at.bofh.it> (permalink)
References <q4S2S-1oE-5@gated-at.bofh.it> <q4SPg-2xi-3@gated-at.bofh.it> <q4TrX-3vn-9@gated-at.bofh.it>
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On Fri, Sep 04, 2015 at 05:11:43PM +1000, Dave Chinner wrote:
> $ grep PARAVIRT .config
> CONFIG_PARAVIRT=y
> # CONFIG_PARAVIRT_DEBUG is not set
> # CONFIG_PARAVIRT_SPINLOCKS is not set
> CONFIG_PARAVIRT_TIME_ACCOUNTING=y
> CONFIG_PARAVIRT_CLOCK=y
> $

Curious, with PARAVIRT_SPINLOCKS=n we _should_ end up in
virt_queued_spin_lock() which is a simple test-and-set lock, much like
the lock debugging code should end up being.


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Thread

[4.2, Regression] Queued spinlocks cause major XFS performance  regression Dave Chinner <david@fromorbit.com> - 2015-09-04 07:50 +0200
  Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-04 08:40 +0200
    Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Dave Chinner <david@fromorbit.com> - 2015-09-04 09:20 +0200
      Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Juergen Gross <jgross@suse.com> - 2015-09-04 09:40 +0200
      Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-04 10:00 +0200
      Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Dave Chinner <david@fromorbit.com> - 2015-09-04 10:40 +0200
        Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-04 17:10 +0200
          Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-04 17:20 +0200
            Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-04 17:30 +0200
              Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Dave Chinner <david@fromorbit.com> - 2015-09-07 01:40 +0200
              Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Davidlohr Bueso <dave@stgolabs.net> - 2015-09-07 02:10 +0200
                Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-07 09:00 +0200
            Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-04 17:30 +0200
              Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-04 17:40 +0200
                Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-04 18:00 +0200
                Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-04 18:00 +0200
                Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-05 19:50 +0200
    Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-04 09:40 +0200
      Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-04 13:40 +0200
        Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Dave Chinner <david@fromorbit.com> - 2015-09-05 00:10 +0200
        Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Dave Chinner <david@fromorbit.com> - 2015-09-07 01:50 +0200

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