Bug 709581

Summary: /proc/stat values rolling over too soon.
Product: Red Hat Enterprise Linux 3 Reporter: pkarnik
Component: kernelAssignee: Red Hat Kernel Manager <kernel-mgr>
Status: CLOSED WONTFIX QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 3.9   
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2012-06-20 13:31:42 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description pkarnik 2011-06-01 05:13:03 UTC 
Description of problem:
We calculate the Total CPU time by adding up all the values of the /proc/stat cpu row:

[root@usbroccmp1 ciscotac]# more /proc/stat
cpu  423068303 6960627 135286291 465738508 22200131 1122132 64616836
cpu0 213690753 3535601 69121220 2373602539 10577537 1026646 35425802
cpu1 209377550 3425026 66165071 2387103265 11622594 95486 29191034
page 135524303 1503848802
swap 12144845 14634802
intr 4104060888 2721371962 2 0 0 0 0 0 0 2 0 0 0 0 0 819660 0 4187095980 0 10187
34943 0 0 270156855 200848780 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
disk_io:
ctxt 1677513380
btime 1279231168
processes 244296931
procs_running 2
procs_blocked 0
[root@usbroccmp1 ciscotac]#

The total CPU time is the number of days, the device has been up n running. It has been running for more than 300 days now. But, when we add up (213690753 +3535601 + 69121220 + 2373602539 + 10577537 + 1026646 + 35425802) / 100 / 86400, the number of days is only 129. Looks like the values of /proc/stat are rolling over at 260 days. Is this a bug ?

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Comment 1 Jiri Pallich 2012-06-20 13:31:42 UTC 
Thank you for submitting this issue for consideration in Red Hat Enterprise Linux. The release for which you requested us to review is now End of Life. 
Please See https://access.redhat.com/support/policy/updates/errata/

If you would like Red Hat to re-consider your feature request for an active release, please re-open the request via appropriate support channels and provide additional supporting details about the importance of this issue.