linux-kernel - Re: [PATCH v2 01/15] KVM: MMU: fix the count of spte number

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Message-Id: <6A5E49EE-3729-4825-AF31-CF03DDD92E64@gmail.com>
Date:	Sun, 8 Sep 2013 22:24:05 +0800
From:	Xiao Guangrong <xiaoguangrong.eric@...il.com>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	avi.kivity@...il.com, mtosatti@...hat.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 01/15] KVM: MMU: fix the count of spte number


On Sep 8, 2013, at 10:01 PM, Gleb Natapov <gleb@...hat.com> wrote:

> On Sun, Sep 08, 2013 at 09:55:04PM +0800, Xiao Guangrong wrote:
>> 
>> On Sep 8, 2013, at 8:19 PM, Gleb Natapov <gleb@...hat.com> wrote:
>> 
>>> On Thu, Sep 05, 2013 at 06:29:04PM +0800, Xiao Guangrong wrote:
>>>> If the desc is the last one and it is full, its sptes is not counted
>>>> 
>>> Hmm, if desc is not full but it is not the last one all sptes after the
>>> desc are not counted too.
>> 
>> But the desc must be the last one if it's not full since we always add
>> new entry or delete entry from the last desc.
>> 
> Why do we alway delete entries from last desc? We delete them from the
> desc we found them in. Current code does not try to move entries between
> descs, only inside a desc.

Oh, yes. Sorry, my memory is wrong… :(

So, currently there has some gaps in desc and it wastes memory.  Can not fix
them with simple change and  i think it is not worthy to fix them separately since
after my new algorithm, these should all be fixed… so how about just drop this
fix?



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