linux-kernel - Re: [PATCH 3/6] KVM MMU: optimize/cleanup for marking parent unsync

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Message-ID: <4BC3CE83.8020705@cn.fujitsu.com>
Date:	Tue, 13 Apr 2010 09:53:07 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] KVM MMU: optimize/cleanup for marking parent unsync



Marcelo Tosatti wrote:

> Xiao,
> 
> Did you actually see this codepath as being performance sensitive? 

Actually, i not run benchmarks to contrast the performance before this patch
and after this patch.

> 
> I'd prefer to not touch it.

This patch avoids walk all parents and i think this overload is really unnecessary.
It has other tricks in this codepath but i not noticed? :-)

Thanks,
Xiao
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