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Date:	Sun, 08 Nov 2009 14:43:17 +0200
From:	Avi Kivity <>
To:	Ingo Molnar <>
CC:	Gleb Natapov <>,,,,
	"H. Peter Anvin" <>,
	Thomas Gleixner <>,
	Fr??d??ric Weisbecker <>
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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