From: Dave Hansen <haveblue@us.ibm.com>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, mbligh@google.com
Subject: Re: [RFC 5/7] LTTng instrumentation mm
Date: Mon, 19 Nov 2007 10:04:45 -0800 [thread overview]
Message-ID: <1195495485.27759.115.camel@localhost> (raw)
In-Reply-To: <20071116143019.GA16082@Krystal>
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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next prev parent reply other threads:[~2007-11-19 18:05 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20071113193349.214098508@polymtl.ca>
2007-11-13 19:33 ` [RFC 5/7] LTTng instrumentation mm Mathieu Desnoyers
2007-11-15 21:06 ` Dave Hansen
2007-11-15 21:51 ` Mathieu Desnoyers
2007-11-15 22:16 ` Dave Hansen
2007-11-16 14:30 ` Mathieu Desnoyers
2007-11-19 18:04 ` Dave Hansen [this message]
2007-11-28 14:09 ` [RFC PATCH] LTTng instrumentation mm (using page_to_pfn) Mathieu Desnoyers
2007-11-28 16:54 ` Dave Hansen
2007-11-29 2:34 ` Mathieu Desnoyers
2007-11-29 6:25 ` Dave Hansen
2007-11-30 16:11 ` [RFC PATCH] LTTng instrumentation mm (updated) Mathieu Desnoyers
2007-11-30 17:46 ` Dave Hansen
2007-11-30 17:05 ` Mathieu Desnoyers
2007-11-30 18:42 ` Dave Hansen
2007-11-30 19:10 ` Mathieu Desnoyers
2007-12-04 19:15 ` Frank Ch. Eigler
2007-12-04 19:25 ` Mathieu Desnoyers
2007-12-04 19:40 ` Dave Hansen
2007-12-04 20:05 ` Mathieu Desnoyers
2007-12-04 20:24 ` Dave Hansen
2007-12-04 20:28 ` Dave Hansen
2007-11-16 14:47 ` [RFC 5/7] LTTng instrumentation mm Mathieu Desnoyers
2007-11-19 18:07 ` Dave Hansen
2007-11-19 18:52 ` Mathieu Desnoyers
2007-11-19 19:00 ` Mathieu Desnoyers
2007-11-19 19:43 ` Dave Hansen
2007-11-19 19:43 ` Dave Hansen
2007-11-19 19:52 ` [PATCH] Cast __page_to_pfn to unsigned long in CONFIG_SPARSEMEM Mathieu Desnoyers
2007-11-19 20:09 ` Dave Hansen
2007-11-19 20:20 ` [PATCH] Cast page_to_pfn " Mathieu Desnoyers
2007-11-19 21:08 ` Andrew Morton
2007-11-19 21:19 ` Dave Hansen
2007-11-19 21:26 ` Dave Hansen
2007-11-21 20:12 ` Christoph Lameter
2007-11-20 17:34 ` Mathieu Desnoyers
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