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Re: [RFC][PATCH] spin loop arch primitives for busy waiting

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [RFC][PATCH] spin loop arch primitives for busy waiting
Date 2017-04-07 11:50 +0200
Message-ID <ttyGK-5mq-17@gated-at.bofh.it> (permalink)
References (4 earlier) <tt45X-1FN-11@gated-at.bofh.it> <ttgqu-1dQ-11@gated-at.bofh.it> <tthmx-2d4-1@gated-at.bofh.it> <ttiBY-3iF-19@gated-at.bofh.it> <ttjy2-3Us-17@gated-at.bofh.it>
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On Thu, Apr 06, 2017 at 10:31:46AM -0700, Linus Torvalds wrote:
> But maybe "monitor" is really cheap. I suspect it's microcoded,
> though, which implies "no".

On my IVB-EP (will also try on something newer):

MONITOR	~332 cycles
MWAIT	~224 cycles (C0, explicitly invalidated MONITOR)

So yes, expensive.

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[RFC][PATCH] spin loop arch primitives for busy waiting Nicholas Piggin <npiggin@gmail.com> - 2017-04-03 10:20 +0200
  Re: [RFC][PATCH] spin loop arch primitives for busy waiting Linus Torvalds <torvalds@linux-foundation.org> - 2017-04-03 17:40 +0200
    Re: [RFC][PATCH] spin loop arch primitives for busy waiting Nicholas Piggin <npiggin@gmail.com> - 2017-04-04 02:00 +0200
      Re: [RFC][PATCH] spin loop arch primitives for busy waiting Linus Torvalds <torvalds@linux-foundation.org> - 2017-04-04 02:50 +0200
        Re: [RFC][PATCH] spin loop arch primitives for busy waiting Nicholas Piggin <npiggin@gmail.com> - 2017-04-04 05:10 +0200
          Re: [RFC][PATCH] spin loop arch primitives for busy waiting Nicholas Piggin <npiggin@gmail.com> - 2017-04-04 06:20 +0200
          Re: [RFC][PATCH] spin loop arch primitives for busy waiting David Miller <davem@davemloft.net> - 2017-04-05 16:10 +0200
            Re: [RFC][PATCH] spin loop arch primitives for busy waiting Nicholas Piggin <npiggin@gmail.com> - 2017-04-06 03:10 +0200
              Re: [RFC][PATCH] spin loop arch primitives for busy waiting Will Deacon <will.deacon@arm.com> - 2017-04-06 16:20 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Linus Torvalds <torvalds@linux-foundation.org> - 2017-04-06 17:20 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Peter Zijlstra <peterz@infradead.org> - 2017-04-06 18:40 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Linus Torvalds <torvalds@linux-foundation.org> - 2017-04-06 19:40 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Peter Zijlstra <peterz@infradead.org> - 2017-04-06 21:30 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Linus Torvalds <torvalds@linux-foundation.org> - 2017-04-06 21:50 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Nicholas Piggin <npiggin@gmail.com> - 2017-04-07 05:40 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Peter Zijlstra <peterz@infradead.org> - 2017-04-07 11:50 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Nicholas Piggin <npiggin@gmail.com> - 2017-04-07 13:30 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Nicholas Piggin <npiggin@gmail.com> - 2017-04-06 17:40 +0200
                Re: [RFC][PATCH] spin loop arch primitives for busy waiting Will Deacon <will.deacon@arm.com> - 2017-04-07 18:20 +0200

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