From: Sonny Rao <sonny@burdell.org>
To: Chris Friesen <cfriesen@nortel.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: kernel memory map/usage/holes?
Date: Wed, 19 Jul 2006 00:47:11 -0400 [thread overview]
Message-ID: <20060719044711.GA21794@kevlar.burdell.org> (raw)
In-Reply-To: <44BBEDE1.3040004@nortel.com>
On Mon, Jul 17, 2006 at 02:06:57PM -0600, Chris Friesen wrote:
>
> I've got a Maple board with 4GB of memory running a modified 2.6.10
> kernel. When it boots, I see the following in the logs:
>
>
> Top of RAM: 0x180000000, Total RAM: 0x100000000
> On node 0 totalpages: 1048576
> DMA zone: 1048576 pages, LIFO batch:16
> Normal zone: 0 pages, LIFO batch:1
> HighMem zone: 0 pages, LIFO batch:1
>
>
> Then a bit later, I see:
>
>
> Memory: 4006976k/6291456k available (3408k kernel code, 2284124k
> reserved, 1656k data, 448k bss, 220k init)
>
>
>
> 1048576 pages works out to 4194304kB, so what happened to the 187328kB
> that is the difference between the "Total RAM" and "Memory:" lines?
> We've got an app that wants as much memory as possible, so I need to
> explain where this 183MB of memory is being used.
I think it's part of the "reserved" category, which includes the MMU
hashtable. I'd guess that's where it is.
Sonny
prev parent reply other threads:[~2006-07-19 4:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-17 20:06 kernel memory map/usage/holes? Chris Friesen
2006-07-19 4:47 ` Sonny Rao [this message]
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