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

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Date:	Tue, 26 Jan 2010 14:47:26 -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 01:03 PM, Chris Friesen wrote:

> I'm currently trying to figure out which of the entries in /proc/meminfo
> are actually orthogonal to each other.  Ideally I'd like to be able to
> add up the suitable entries and have it work out to the total memory on
> the system, so that I can then narrow down exactly where the memory is
> going.  Is this feasable?

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.

Here's /proc/meminfo after 1070 minutes:

MemTotal:      4042848 kB
MemFree:        406112 kB
Buffers:         12072 kB
Cached:        3068368 kB
SwapCached:          0 kB
Active:         671200 kB
Inactive:      2711952 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:              44 kB
Writeback:           0 kB
AnonPages:      235864 kB
Mapped:          30752 kB
Slab:           200156 kB
SReclaimable:   142828 kB
SUnreclaim:      57328 kB
PageTables:       4320 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
WritebackTmp:        0 kB
CommitLimit:   2021424 kB
Committed_AS:  2593116 kB
VmallocTotal: 34359738367 kB
VmallocUsed:     21496 kB
VmallocChunk: 34359716779 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
HugePages_Surp:      0
Hugepagesize:     2048 kB
DirectMap4k:      3008 kB
DirectMap2M:   4190208 kB

Any ideas how to track down the missing memory?

Chris
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