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Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu critical sections

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu critical sections
Date 2016-04-07 17:50 +0200
Message-ID <rlklX-65f-9@gated-at.bofh.it> (permalink)
References <qomjM-3hW-9@gated-at.bofh.it> <rkY26-68Y-13@gated-at.bofh.it> <rlgV4-3zm-13@gated-at.bofh.it> <rljge-5hz-1@gated-at.bofh.it> <rlk2C-5YE-21@gated-at.bofh.it>
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On Thu, Apr 07, 2016 at 05:24:32PM +0200, Peter Zijlstra wrote:
> On Thu, Apr 07, 2016 at 07:35:26AM -0700, Andy Lutomirski wrote:
> > That way we could take an async signal, handle it, and resume, even in
> > the middle of a commit, without aborting.  Of course, if the signal
> > hander tried to access the same rseq-protected resource, it would bump
> > the event counter and cause an abort.
> 
> Ah, so what happens if the signal happens before the commit but after
> the load of the seqcount?
> 
> Then, even if the signal motifies the count, we'll not observe.

Ah, and the same is true for preemptions. Which is why all this was
preemption driven, and not migration driven.

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Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-06 18:00 +0200
  Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Peter Zijlstra <peterz@infradead.org> - 2016-04-07 14:10 +0200
    Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-07 16:40 +0200
      Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Peter Zijlstra <peterz@infradead.org> - 2016-04-07 17:30 +0200
        Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Peter Zijlstra <peterz@infradead.org> - 2016-04-07 17:50 +0200
        Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-07 17:50 +0200
          Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Peter Zijlstra <peterz@infradead.org> - 2016-04-07 18:00 +0200
            Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-07 18:50 +0200
              Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Peter Zijlstra <peterz@infradead.org> - 2016-04-07 22:20 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-08 00:10 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space  percpu critical sections Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-04-08 03:20 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-08 03:30 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space  percpu critical sections Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-04-08 04:10 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space  percpu critical sections Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-04-08 19:50 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-08 23:20 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Linus Torvalds <torvalds@linux-foundation.org> - 2016-04-08 23:30 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space  percpu critical sections Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-04-10 16:10 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Peter Zijlstra <peterz@infradead.org> - 2016-04-08 13:10 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-08 18:00 +0200
              Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Peter Zijlstra <peterz@infradead.org> - 2016-04-08 08:50 +0200
                Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space percpu  critical sections Andy Lutomirski <luto@amacapital.net> - 2016-04-08 18:00 +0200
              Re: [RFC PATCH 0/3] restartable sequences v2: fast user-space  percpu critical sections Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-04-12 00:00 +0200

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