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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 2016-04-08 13:10 +0200
Message-ID <rlCsx-2SG-1@gated-at.bofh.it> (permalink)
References (5 earlier) <rlklY-65f-11@gated-at.bofh.it> <rlkvE-692-5@gated-at.bofh.it> <rlli2-6NG-27@gated-at.bofh.it> <rlozg-Pg-9@gated-at.bofh.it> <rlqhJ-26I-25@gated-at.bofh.it>
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On Thu, Apr 07, 2016 at 03:05:26PM -0700, Andy Lutomirski wrote:

> It doesn't, which is what I like about my variant.  If the thread
> accesses the protected data structure, though, it should bump the
> sequence count, which will cause the first thread to about when it
> gets scheduled in.

Nope it won't, because that first thread is right at the commit
instruction, nothing will stop it from executing that store and clobbing
what we just wrote.

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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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