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xen-devel
[Xen-devel] Re: [PATCH 00/20] x86: ticket lock rewrite and paravirtualiz
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 00/20] x86: ticket lock rewrite and paravirtualization |
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From: |
Peter Zijlstra <peterz@xxxxxxxxxxxxx> |
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Date: |
Mon, 15 Nov 2010 22:08:32 +0100 |
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Cc: |
Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>, Srivatsa, Linux, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Kivity <avi@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Avi |
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Mon, 15 Nov 2010 13:11:22 -0800 |
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<cover.1288794124.git.jeremy.fitzhardinge@xxxxxxxxxx> <4CDDBBD3.5050903@xxxxxxxxx> <4CDDBCE4.80906@xxxxxxxx> <4CDDBDB5.8000800@xxxxxxxxx> <4CE1915F.60507@xxxxxxxx> <4CE1920F.5000509@xxxxxxxxx> <1289852088.2109.553.camel@laptop> <4CE19FD1.2000804@xxxxxxxx> |
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On Mon, 2010-11-15 at 13:02 -0800, Jeremy Fitzhardinge wrote:
>
> As a heuristic, it shouldn't be too bad performancewise, since
> (handwaving) if ticketholder N has entered the slowpath, then its likely
> that N+1 will as well.
Yes, esp. if the whole slow unlock path takes more cycles than you spin
for to begin with.
I think this approach is definitely worth trying.
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