linux-kernel - Re: [kvm-devel] [PATCH] mmu notifiers #v3

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Message-ID: <4795F9D2.1050503@qumranet.com>
Date:	Tue, 22 Jan 2008 16:12:34 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Andrea Arcangeli <andrea@...ranet.com>
CC:	Izik Eidus <izike@...ranet.com>, Andrew Morton <akpm@...l.org>,
	Nick Piggin <npiggin@...e.de>, kvm-devel@...ts.sourceforge.net,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	steiner@....com, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com, holt@....com,
	Hugh Dickins <hugh@...itas.com>, clameter@....com
Subject: Re: [kvm-devel] [PATCH] mmu notifiers #v3

Andrea Arcangeli wrote:
> diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -44,8 +44,10 @@
>  ({									\
>  	int __young;							\
>  	__young = ptep_test_and_clear_young(__vma, __address, __ptep);	\
> -	if (__young)							\
> +	if (__young) {							\
>  		flush_tlb_page(__vma, __address);			\
> +		mmu_notifier(age_page, (__vma)->vm_mm, __address);	\
> +	}								\
>  	__young;							\
>  })
>   

I think that unconditionally doing

  __young |= mmu_notifier(test_and_clear_young, ...);

allows hardware with accessed bits more control over what is going on.

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

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