Bug 1017832

Description of problem:
Although the GUI reports "Memory page sharing: inactive", unless ksmtuned is stopped manually with 'service ksmtuned stop', kernel shared memory is still used. In addition, on the RHEV-H there is no easy way to chkconfig the service off so that ksmtuned stays off upon reboot.

Version-Release number of selected component (if applicable):
Red Hat Enterprise Virtualization Hypervisor release 6.4 (20130709.0.el6_4)

How reproducible:
Set Memory page sharing to Inactive and check for ksmtuned running with cat /sys/kernel/mm/ksm/run

Steps to Reproduce:
1. Set Memory page sharing to Inactive
2. ps aux|grep ksmtuned
3. cat /sys/kernel/mm/ksm/run
4. Observe the service is still running

Actual results:
ksmtuned has to be manually stopped and starts up after a reboot of the hypervisor

Expected results:
ksmtuned is disabled and chkconfig'd off

Additional info:
This can be worked around with the following:

1) Add exit 0 to the two following files:
/etc/sysconfig/ksm
/etc/ksmtuned.conf

[root@localhost admin]# cat /etc/sysconfig/ksm 
# The maximum number of unswappable kernel pages
# which may be allocated by ksm (0 for unlimited)
# If unset, defaults to half of total memory
# KSM_MAX_KERNEL_PAGES=i
exit 0 <-----------------------------------------------------------Added

[root@localhost admin]# cat /etc/ksmtuned.conf 
# Configuration file for ksmtuned.

# How long ksmtuned should sleep between tuning adjustments
# KSM_MONITOR_INTERVAL=60

# Millisecond sleep between ksm scans for 16Gb server.
# Smaller servers sleep more, bigger sleep less.
# KSM_SLEEP_MSEC=10

# KSM_NPAGES_BOOST=300
# KSM_NPAGES_DECAY=-50
# KSM_NPAGES_MIN=64
# KSM_NPAGES_MAX=1250

# KSM_THRES_COEF=20
# KSM_THRES_CONST=2048

# uncomment the following if you want ksmtuned debug info

# LOGFILE=/var/log/ksmtuned
# DEBUG=1
exit 0 <-----------------------------------------------------------Added

2) Persist the files

[root@localhost admin]# persist /etc/ksmtuned.conf 
 File persisted

Successfully persisted /etc/ksmtuned.conf

[root@localhost admin]# persist /etc/sysconfig/ksm 
 File persisted

Successfully persisted /etc/sysconfig/ksm


3) After a restart of the hypervisor you will see that the service is chkconfig'd on but the process will be dead:

[root@localhost admin]# chkconfig --list ksm;chkconfig --list ksmtuned
ksm            	0:off	1:off	2:off	3:on	4:on	5:on	6:off
ksmtuned       	0:off	1:off	2:off	3:on	4:on	5:on	6:off

[root@localhost admin]# /etc/init.d/ksmtuned status
ksmtuned dead but subsys locked

[root@localhost admin]# cat /sys/kernel/mm/ksm/run
0