linux-kernel - Re: [PATCH 02/11] Add "handle page fault" PV helper.

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Message-ID: <4AF6BCE5.3030701@redhat.com>
Date:	Sun, 08 Nov 2009 14:43:17 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Gleb Natapov <gleb@...hat.com>, kvm@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 02/11] Add "handle page fault" PV helper.

On 11/08/2009 01:36 PM, Ingo Molnar wrote:
>> Three existing callbacks are: kmemcheck, mmiotrace, notifier. Two
>> of them kmemcheck, mmiotrace are enabled only for debugging, should
>> not be performance concern. And notifier call sites (two of them)
>> are deliberately, as explained by comment, not at the function entry,
>> so can't be unified with others. (And kmemcheck also has two different
>> call site BTW)
>>      
> We want mmiotrace to be generic distro capable so the overhead when the
> hook is not used is of concern.
>
>    

Maybe we should generalize paravirt-ops patching in case if (x) f() is 
deemed too expensive.

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

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