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Re: [PATCH v4 0/5] getcpu_cache system call for 4.6

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On 02/23/2016 03:28 PM, Mathieu Desnoyers wrote:
> Hi,
> 
> Here is a patchset implementing a cache for the CPU number of the
> currently running thread in user-space.
> 
> Benchmarks comparing this approach to a getcpu based on system call on
> ARM show a 44x speedup. They show a 14x speedup on x86-64 compared to
> executing lsl from a vDSO through glibc.
> 
> I'm added a man page in the changelog of patch 1/3, which shows an
> example usage of this new system call.
> 
> This series is based on v4.5-rc5, submitted for Linux 4.6.
> 
> Feedback is welcome,
> 

What is the resulting context switch overhead?

	-hpa

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[PATCH v4 0/5] getcpu_cache system call for 4.6 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-02-24 00:30 +0100
  [PATCH v4 2/5] getcpu_cache: ARM resume notifier Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-02-24 00:40 +0100
  [PATCH v4 5/5] getcpu_cache: wire up x86 32/64 system call Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-02-24 00:40 +0100
  [PATCH v4 4/5] getcpu_cache: x86 32/64 resume notifier Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-02-24 00:40 +0100
  Re: [PATCH v4 0/5] getcpu_cache system call for 4.6 "H. Peter Anvin" <hpa@zytor.com> - 2016-02-24 02:40 +0100
    Re: [PATCH v4 0/5] getcpu_cache system call for 4.6 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-02-24 05:10 +0100
      Re: [PATCH v4 0/5] getcpu_cache system call for 4.6 "H. Peter Anvin" <hpa@zytor.com> - 2016-02-24 21:30 +0100
        Re: [PATCH v4 0/5] getcpu_cache system call for 4.6 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-02-24 23:40 +0100

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