Bug 522827 - Hourly cron job causes high system load under Xen kernel (dom0) without XenStoreD running [NEEDINFO]

Aliases:
Summary:	Hourly cron job causes high system load under Xen kernel (dom0) without XenSt...

Status:	CLOSED ERRATA

Aliases:	None (edit)

Product:	Red Hat Enterprise Linux 5
Component(s):	mcelog (Show other bugs)
Version(s):	5.5
Platform:	All Linux

Priority:	low Severity:medium
Target Release:	--- Target Milestone: rc
Assigned To:	Prarit Bhargava
QA Contact:	BaseOS QE

URL:
Whiteboard:
Keywords:	OtherQA, Regression

Depends on:
Blocks:	525703
	Show dependency tree

Reported:	2009-09-11 13:08 EDT by Adam Stokes
Modified:	2011-01-24 19:18 EST (History)
CC List:	9 users (show) brian.dudek cward emcnabb jaswang jscotka ralph riek sdodson tao

See Also:

Flags:	prarit: needinfo? (astokes) cward: needinfo? (astokes)

Fixed In Version:
Technical Notes:
Story Points (Public):	---
Clone Of:
Environment:
Last Closed:	2010-03-30 04:26:47
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:

Attachments	(Terms of Use)
updated RHEL5 mcelog.cron (263 bytes, text/plain) 2009-09-15 08:22 EDT, Prarit Bhargava	no flags	Details
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Description Adam Stokes 2009-09-11 13:08:45 EDT

Description of problem:
Hourly cron job causes high system load under Xen kernel (dom0) without
XenStoreD running

Version-Release number of selected component (if applicable):
mcelog-0.9pre-1.27.el5


How reproducible:
100%

Steps to Reproduce:
1. run cron mcelog on a PV
2. 
3.

Actual results:
Load increase on systems and mcelog process blocks

Expected results:
No process block or load increase

Additional info:
I believe this should be a simple fix, The patch in rhbz#511126 is causing the
regression.

In my opinion we should be testing for domU in this sense:

If we can read /proc/xen/capabilities and grep the status of `grep -q control_d
/proc/xen/capabilities` we can better tell if we are on a guest or not.

Please not this is how we do it in sosreport and you can have a look the xen
plugin there for further info:

https://fedorahosted.org/sos/browser/trunk/src/lib/sos/plugins/xen.py

Look under determineXenHost method.

Thanks

https://bugzilla.redhat.com/show_bug.cgi?id=522827

Bug 522827 - Hourly cron job causes high system load under Xen kernel (dom0)