linux-kernel - Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE handler

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Message-ID: <507150A7.9010001@redhat.com>
Date:	Sun, 07 Oct 2012 11:51:35 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
CC:	Gleb Natapov <gleb@...hat.com>,
	Jiannan Ouyang <ouyang@...pitt.edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Srikar <srikar@...ux.vnet.ibm.com>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	KVM <kvm@...r.kernel.org>, chegu vinod <chegu_vinod@...com>,
	"Andrew M. Theurer" <habanero@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>
Subject: Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE
 handler

On 10/05/2012 10:36 AM, Raghavendra K T wrote:
>>>
>>> You can store i in the vcpu itself:
>>>
>>>    set_bit(vcpu->index, &kvm->preempted);
>>>
>> This will make the fact that vcpus are stored in an array into API
>> instead of implementation detail :( There were patches for vcpu
>> destruction that changed the array to rculist. Well, it will be still
>> possible to make the array rcu protected and copy it every time vcpu is
>> deleted/added I guess.
>>
> 
> If IUC, summary is, we are going with
> - Let vcpu array be rcu protected.

That's for the future.  For now ->vcpus[] is statically allocated.

> - we use index inside vcpu and should be updated when a vcpu is
> added/deleted.

Yes.


-- 
error compiling committee.c: too many arguments to function
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