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Re: [Xen-devel] [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks
- To: "Ingo Molnar" <mingo@xxxxxxxxxx>
- From: "Jan Beulich" <JBeulich@xxxxxxxx>
- Date: Tue, 15 May 2012 12:26:37 +0100
- Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, X86 <x86@xxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Attilio Rao <attilio.rao@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Stephan Diestelhorst <stephan.diestelhorst@xxxxxxx>
- Delivery-date: Sun, 20 May 2012 02:59:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
>>> On 07.05.12 at 19:25, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
(apologies for the late reply, the mail just now made it to my inbox
via xen-devel)
> I'll hold off on the whole thing - frankly, we don't want this
> kind of Xen-only complexity. If KVM can make use of PLE then Xen
> ought to be able to do it as well.
It does - for fully virtualized guests. For para-virtualized ones,
it can't (as the hardware feature is an extension to VMX/SVM).
> If both Xen and KVM makes good use of it then that's a different
> matter.
I saw in a later reply that you're now tending towards trying it
out at least - thanks.
Jan
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