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Re: [Qemu-devel] [RFC PATCH] Introduce RCU-enabled DQs (v2)
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [RFC PATCH] Introduce RCU-enabled DQs (v2) |
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Date: |
Tue, 27 Aug 2013 00:23:16 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8 |
Il 26/08/2013 23:48, Mike Day ha scritto:
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>
> Mathieu - Thanks for the review! And thanks for the code, I'm working
> with it right now. I like the idea of using a flag to provide a form of
> atomicity for the doubly-linked list elements. I'm also planning on
> running some timing tests to see of the additional memory barriers and
> atomic accesses make *any* difference whatsoever.
We probably have already too many queue/list variations (a relic of the
BSD queue.h headers). Linux does not need RCU-friendly reverse
iteration at all, do we really need it? In other words, I think your v2
was really close to mergeable state...
Paolo