linux-kernel - Re: [PATCH] x86: keep the page count correct

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Date:	Mon, 27 Oct 2008 18:55:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: keep the page count correct


* Suresh Siddha <suresh.b.siddha@...el.com> wrote:

> On Sat, Oct 25, 2008 at 10:58:21PM -0700, Yinghai Lu wrote:
> > 
> > impact: get correct page count for 2M and 1G...
> > 
> > found page count in /proc/meminfo is nor correct on 1G system in VirtualBox 2.0.4
> > 
> > # cat /proc/meminfo
> > MemTotal:        1017508 kB
> > MemFree:          822700 kB
> > Buffers:            1456 kB
> > Cached:            26632 kB
> > SwapCached:            0 kB
> > ...
> > Hugepagesize:       2048 kB
> > DirectMap4k:      4032 kB
> > DirectMap2M:  18446744073709549568 kB
> > 
> > with this patch get:
> > ...
> > DirectMap4k:      4032 kB
> > DirectMap2M:   1044480 kB
> > 
> > which is consistent to kernel_page_tables
> > ---[ Low Kernel Mapping ]---
> > 0xffff880000000000-0xffff880000001000           4K     RW     PCD     GLB x  pte
> > 0xffff880000001000-0xffff88000009f000         632K     RW             GLB x  pte
> > 0xffff88000009f000-0xffff8800000a0000           4K     RW     PCD     GLB x  pte
> > 0xffff8800000a0000-0xffff880000200000        1408K     RW             GLB x  pte
> > 0xffff880000200000-0xffff88003fe00000        1020M     RW         PSE GLB x  pmd
> > 0xffff88003fe00000-0xffff88003fff0000        1984K     RW             GLB NX pte
> > 0xffff88003fff0000-0xffff880040000000          64K                           pte
> > 0xffff880040000000-0xffff888000000000         511G                           pud
> > 0xffff888000000000-0xffffc20000000000       58880G                           pgd
> > 
> > Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> Acked-by: Suresh Siddha <suresh.b.siddha@...el.com>

applied to tip/x86/urgent, thanks guys!

	Ingo
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