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Bug 170025 - /proc/kcore size not equal to installed memory
/proc/kcore size not equal to installed memory
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Ernie Petrides
Brian Brock
Depends On:
  Show dependency treegraph
Reported: 2005-10-06 12:55 EDT by strovato
Modified: 2007-11-30 17:07 EST (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2005-10-06 16:40:48 EDT
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Description strovato 2005-10-06 12:55:49 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.7.12) Gecko/20050928 Firefox/1.0.7

Description of problem:
Size of /proc/kcore does not match installed RAM.

# ls -l /proc/kcore
-r--------    1 root     root     939528192 Oct  6 12:54 /proc/kcore

# free
             total       used       free     shared    buffers     cached
Mem:       2055312    2037452      17860          0       9168    1377076
-/+ buffers/cache:     651208    1404104
Swap:       755044          0     755044

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. compare memory size as reported by free and the size of /proc/kcore

Actual Results:  Amount of physical memory reported differs.

Expected Results:  Amount of physical memory reported should be the same.

Additional info:

The machine is a Dell Poweredge 2600 w/2 Xeon CPUs
Comment 1 Ernie Petrides 2005-10-06 16:40:48 EDT
The size shown for "ls -l /proc/kcore" is not supposed to be the size
of memory, but rather it is total amount of address space used by the
kernel plus various pseudo-device headers.

The total memory size reported by /proc/meminfo is more relevant,
although that doesn't include the amount occupied by the BIOS and
certain reserved regions (e.g., static kernel text and data).

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