linux-kernel - Re: which fields in /proc/meminfo are orthogonal?

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Message-ID: <4B5F7F53.8060002@nortel.com>
Date:	Tue, 26 Jan 2010 17:48:35 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: which fields in /proc/meminfo are orthogonal?

On 01/26/2010 02:47 PM, Chris Friesen wrote:

> I've tried adding up
> MemFree+Buffers+Cached+AnonPages+Mapped+Slab+PageTables+VmallocUsed
> 
> (hugepages are disabled and there is no swap)
> 
> Shortly after boot this gets me within about 3MB of MemTotal.  However,
> after 1070 minutes there is a 64MB difference between MemTotal and the
> above sum.

Oddly enough, over the same period it appears that

MemFree + Active + Inactive + Slab + PageTables

is basically (+/- half a meg) constant and equal to "MemTotal - 48.5MB".

It would seem that active/inactive track memory that isn't visible in
Buffers+Cached+AnonPages+Mapped.  Anyone have any suggestions what it
might be?

Thanks,

Chris
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