From: Andi Kleen <ak@suse.de>
To: Dave McCracken <dmccr@us.ibm.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
Magnus Damm <magnus.damm@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management <linux-mm@kvack.org>
Subject: Re: i386 and PAE: pud_present()
Date: Sun, 30 Apr 2006 10:53:26 +0200 [thread overview]
Message-ID: <200604301053.26907.ak@suse.de> (raw)
In-Reply-To: <2432524299CCD3CA89BB647D@[10.1.1.4]>
On Sunday 30 April 2006 08:07, Dave McCracken wrote:
>
> --On Friday, April 28, 2006 10:27:21 +0200 Andi Kleen <ak@suse.de> wrote:
>
> >> Take a look a little further down the page for the comment.
> >>
> >> In i386 + PAE, pud is always present.
> >
> > I think his problem is that the PGD is always present too (in
> > pgtables-nopud.h) Indeed looks strange.
>
> The PGD is always fully populated on i386 if PAE is enabled. All three of
> the pmd pages are allocated at page table creation time and persist till
> the page table is deleted.
At least with the new flexmmap it sounds like a waste of memory.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@suse.de>
To: Dave McCracken <dmccr@us.ibm.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
Magnus Damm <magnus.damm@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management <linux-mm@kvack.org>
Subject: Re: i386 and PAE: pud_present()
Date: Sun, 30 Apr 2006 10:53:26 +0200 [thread overview]
Message-ID: <200604301053.26907.ak@suse.de> (raw)
In-Reply-To: <2432524299CCD3CA89BB647D@[10.1.1.4]>
On Sunday 30 April 2006 08:07, Dave McCracken wrote:
>
> --On Friday, April 28, 2006 10:27:21 +0200 Andi Kleen <ak@suse.de> wrote:
>
> >> Take a look a little further down the page for the comment.
> >>
> >> In i386 + PAE, pud is always present.
> >
> > I think his problem is that the PGD is always present too (in
> > pgtables-nopud.h) Indeed looks strange.
>
> The PGD is always fully populated on i386 if PAE is enabled. All three of
> the pmd pages are allocated at page table creation time and persist till
> the page table is deleted.
At least with the new flexmmap it sounds like a waste of memory.
-Andi
--
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next prev parent reply other threads:[~2006-04-30 8:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-28 7:40 i386 and PAE: pud_present() Magnus Damm
2006-04-28 7:40 ` Magnus Damm
2006-04-28 7:54 ` Nick Piggin
2006-04-28 7:54 ` Nick Piggin
2006-04-28 8:27 ` Andi Kleen
2006-04-28 8:27 ` Andi Kleen
2006-04-30 6:07 ` Dave McCracken
2006-04-30 6:07 ` Dave McCracken
2006-04-30 8:53 ` Andi Kleen [this message]
2006-04-30 8:53 ` Andi Kleen
[not found] ` <2432524299CCD3CA89BB647D@10.1.1.4>
2006-05-01 3:07 ` Magnus Damm
2006-05-01 3:07 ` Magnus Damm
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