From: "Stephen C. Tweedie" <sct@redhat.com>
To: Bulent Abali <abali@us.ibm.com>
Cc: linux-mm@kvack.org
Subject: Re: How do you determine PA in the X86_PAE mode.
Date: Fri, 26 Jan 2001 11:53:27 +0000 [thread overview]
Message-ID: <20010126115327.K11607@redhat.com> (raw)
In-Reply-To: <OF0A565D7B.D20E47EA-ON852569DF.00791D69@pok.ibm.com>; from abali@us.ibm.com on Thu, Jan 25, 2001 at 05:09:40PM -0500
Hi,
On Thu, Jan 25, 2001 at 05:09:40PM -0500, Bulent Abali wrote:
> Given struct page * p, how do you determine the physical page number in the
> CONFIG_X86_PAE mode?
> Is it simply (p - mem_map) ? Thanks for any suggestions.
Yes, but only on i386 machines. There are other systems which don't
necessarily have all their physical memory arranged sequentially, so
the 2.4 VM avoids using physical page numbers in any of the high-level
code. You're better off just using the struct page * to reference the
page, and convert that to virtual addresses as you need it.
--Stephen
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prev parent reply other threads:[~2001-01-26 11:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-25 22:09 Bulent Abali
2001-01-26 11:53 ` Stephen C. Tweedie [this message]
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