linux-kernel - Re: [RFC 5/7] LTTng instrumentation mm

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Message-Id: <1195495485.27759.115.camel@localhost>
Date:	Mon, 19 Nov 2007 10:04:45 -0800
From:	Dave Hansen <haveblue@...ibm.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, mbligh@...gle.com
Subject: Re: [RFC 5/7] LTTng instrumentation mm

On Fri, 2007-11-16 at 09:30 -0500, Mathieu Desnoyers wrote:
> I see that the standard macro to get the kernel address from a pfn is :
> 
> asm-x86/page_32.h:#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
> 
> The question might seem trivial, but I wonder how this deals with large
> pages ?

Well, first of all, large pages are a virtual addressing concept.  We're
only talking about physical addresses here.  You still address the
memory the same way no matter if it is composed of large or small pages.
The physical address (and pfn) never change no matter what we do with
the page or how we allocate ir.

-- Dave

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