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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: |
"H. Peter Anvin" <hpa@xxxxxxxxx> |
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Date: |
Mon, 15 Nov 2010 12:03:27 -0800 |
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Cc: |
Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, Linux Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx> |
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Mon, 15 Nov 2010 12:05:35 -0800 |
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<cover.1288794124.git.jeremy.fitzhardinge@xxxxxxxxxx> <4CDDBBD3.5050903@xxxxxxxxx> <4CDDBCE4.80906@xxxxxxxx> <4CDDBDB5.8000800@xxxxxxxxx> <4CE1915F.60507@xxxxxxxx> |
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On 11/15/2010 12:00 PM, Jeremy Fitzhardinge wrote:
>
> Another approach I discussed with PeterZ and Mathieu is to steal the LSB
> of the ticket counters (halving the max CPU count) to use as a "there is
> someone in slowpath waiting on this lock". But I haven't spent the time
> to work out an algorithm to maintain that flag (or flags, since there
> are bits available) in a correct and efficient way.
>
Definitely worth pondering.
-hpa
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