linux-kernel - Re: [PATCH RFC V9 0/19] Paravirtualized ticket spinlocks

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Date:	Thu, 11 Jul 2013 13:11:04 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Andrew Jones <drjones@...hat.com>, mingo@...hat.com,
	ouyang@...pitt.edu, habanero@...ux.vnet.ibm.com, jeremy@...p.org,
	x86@...nel.org, konrad.wilk@...cle.com, hpa@...or.com,
	pbonzini@...hat.com, linux-doc@...r.kernel.org,
	xen-devel@...ts.xensource.com, peterz@...radead.org,
	mtosatti@...hat.com, stefano.stabellini@...citrix.com,
	andi@...stfloor.org, attilio.rao@...rix.com, gregkh@...e.de,
	agraf@...e.de, chegu_vinod@...com, torvalds@...ux-foundation.org,
	avi.kivity@...il.com, tglx@...utronix.de, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, riel@...hat.com,
	virtualization@...ts.linux-foundation.org,
	srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH RFC V9 0/19] Paravirtualized ticket spinlocks

On Thu, Jul 11, 2013 at 03:40:38PM +0530, Raghavendra K T wrote:
> >>>>Gleb,
> >>>>Can you elaborate little more on what you have in mind regarding per
> >>>>VM ple_window. (maintaining part of it as a per vm variable is clear
> >>>>to
> >>>>  me), but is it that we have to load that every time of guest entry?
> >>>>
> >>>Only when it changes, shouldn't be to often no?
> >>
> >>Ok. Thinking how to do. read the register and writeback if there need
> >>to be a change during guest entry?
> >>
> >Why not do it like in the patch you've linked? When value changes write it
> >to VMCS of the current vcpu.
> >
> 
> Yes. can be done. So the running vcpu's ple_window gets updated only
> after next pl-exit. right?
I am not sure what you mean. You cannot change vcpu's ple_window while
vcpu is in a guest mode.

--
			Gleb.
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