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Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW

From Mark Rutland <mark.rutland@arm.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW
Date 2016-10-05 22:50 +0200
Message-ID <sp1ix-6VP-15@gated-at.bofh.it> (permalink)
References (2 earlier) <soBo6-5Ek-3@gated-at.bofh.it> <soTuG-UL-9@gated-at.bofh.it> <soXyh-3sY-9@gated-at.bofh.it> <soYum-4mZ-11@gated-at.bofh.it> <sp1ix-6VP-17@gated-at.bofh.it>
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On Wed, Oct 05, 2016 at 08:00:38PM +0000, Fredrik Markström wrote:
> On Wed, Oct 5, 2016 at 7:48 PM Robin Murphy <robin.murphy@arm.com> wrote:
> As far as I understand TPIDRURW isn't anything else then an architecture
> specific piece of tls since the last patch, possibly slightly faster then a
> "__thread u32 x;"
> 
> The irony is that the two different ways it was handled earlier (not context
> switched or always set to zero on swap in) would have made it useful for this
> purpose.

The "not context switched" case was also arbitrarily corrupted, and could not
have been relied upon.

The zeroing case is similar to the restartable sequences design. So that's
probably worth looking into.

Thanks,
Mark.

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Thread

[PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Fredrik Markstrom <fredrik.markstrom@gmail.com> - 2016-10-04 17:50 +0200
  Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Mark Rutland <mark.rutland@arm.com> - 2016-10-04 19:10 +0200
    Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Fredrik Markström <fredrik.markstrom@gmail.com> - 2016-10-05 14:30 +0200
      Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Fredrik Markström <fredrik.markstrom@gmail.com> - 2016-10-05 18:50 +0200
        Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Robin Murphy <robin.murphy@arm.com> - 2016-10-05 19:50 +0200
          Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-10-05 22:00 +0200
            Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Will Deacon <will.deacon@arm.com> - 2016-10-10 17:40 +0200
              Restartable Sequences benchmarks (was: Re: [PATCH v2] arm: Added  support for getcpu() vDSO using TPIDRURW) Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-10-10 18:20 +0200
          Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Mark Rutland <mark.rutland@arm.com> - 2016-10-05 22:50 +0200
            Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-10-05 23:10 +0200
              Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Mark Rutland <mark.rutland@arm.com> - 2016-10-05 23:50 +0200
            Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Fredrik Markström <fredrik.markstrom@gmail.com> - 2016-10-05 23:40 +0200
      Re: [PATCH v2] arm: Added support for getcpu() vDSO using TPIDRURW Mark Rutland <mark.rutland@arm.com> - 2016-10-05 22:50 +0200

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