Re: [PATCH] Improve spinlock inline assembly for x86.

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От Kevin Grittner
Тема Re: [PATCH] Improve spinlock inline assembly for x86.
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Msg-id CACjxUsP4+=1csWCcbUc9KB4bJRybYNoW=NCXbxonAF0mMzHBJQ@mail.gmail.com
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Ответ на Re: [PATCH] Improve spinlock inline assembly for x86.  (Andres Freund <andres@anarazel.de>)
Ответы Re: [PATCH] Improve spinlock inline assembly for x86.  (Andres Freund <andres@anarazel.de>)
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On Mon, Jan 18, 2016 at 4:50 PM, Andres Freund <andres@anarazel.de> wrote:

> Now I'm equally unconvinced that it's worthwhile to do anything
> here. I just don't think benchmarking plays a role either way.

Well, that would be the crucial point on which we differ -- the
rest is all agreement.  I don't think we should accept the patch
*in the absence* of benchmarking to show a result that is neutral
or better.  Spinlocks are just too performance-critical and too
fussy to accept a change on the basis that "the source code looks
fine".  IMO, anyway.

--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



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