Bug 38950 - Kernel shared memory is 0 used or reported by kernel 2.4.2-2 causing memory and swap bloat
Kernel shared memory is 0 used or reported by kernel 2.4.2-2 causing memory a...
Status: CLOSED NOTABUG
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
7.1
i386 Linux
medium Severity high
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Assigned To: Arjan van de Ven
Brock Organ
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Depends On:
Blocks:
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Reported: 2001-05-03 10:05 EDT by Robert J. Osborne
Modified: 2007-04-18 12:33 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-05-03 10:05:42 EDT
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Description Robert J. Osborne 2001-05-03 10:05:38 EDT
From Bugzilla Helper:
User-Agent: Mozilla/4.76 [en] (X11; U; Linux 2.4.2-2 i686)

Description of problem:
Kernel 2.4.2-2 fails to use shared memory between processes, causing
unusually high need for memory.

How reproducible:
Always

Steps to Reproduce:
free
or
cat /proc/meminfo | grep MemShared
or
top

Actual Results:  Report no shared memory- no matter what is loaded or how
many times something is loaded...

Expected Results:  Memory should be shared between processes using the same
read-only segments.

Additional info:

This is a stock RH7.1 install on a cheezy Dell i810 chipset P3 w/ 128MB
ram.

This bug is evident on every 7.1 install I've checked at work (webserver,
two desk-tops.)

I'm dumbfounded nobody has reported this one...
Comment 1 Arjan van de Ven 2001-05-03 10:13:43 EDT
It's just that the 2.4 kernel no longer accounts this as this was a very
expensive operation. memory _IS_ shared however.

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