From 35019eb333d5dbe6d8c7150a5283ca196f6866df Mon Sep 17 00:00:00 2001
From: Amador Pahim <apahim@redhat.com>
Date: Mon, 11 Nov 2013 09:04:47 -0300
Subject: [PATCH 07/11] Allow disable MOM KSM control.
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This patch add ksmEnabled var to enable/disable mom ksm control.
Now users can use vdsClient to runtime disable/enable
(default enabled) ksm control:

 $ vdsClient -s 0 setMOMPolicyParameters ksmEnabled=False

Change-Id: Icc4333ce92561e23c062c398e24f876a74056a05
Bug-Url: http://bugzilla.redhat.com/1025780
Signed-off-by: Amador Pahim <apahim@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/20879
Reviewed-by: Martin Sivák <msivak@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/22150
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Tested-by: Yaniv Bronhaim <ybronhei@redhat.com>
---
 vdsm/mom.d/01-parameters.policy | 1 +
 vdsm/mom.d/03-ksm.policy        | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/vdsm/mom.d/01-parameters.policy b/vdsm/mom.d/01-parameters.policy
index 980e71c..97803d5 100644
--- a/vdsm/mom.d/01-parameters.policy
+++ b/vdsm/mom.d/01-parameters.policy
@@ -1 +1,2 @@
 (defvar balloonEnabled 0)
+(defvar ksmEnabled 1)
diff --git a/vdsm/mom.d/03-ksm.policy b/vdsm/mom.d/03-ksm.policy
index 415fcfd..5a3b1bd 100644
--- a/vdsm/mom.d/03-ksm.policy
+++ b/vdsm/mom.d/03-ksm.policy
@@ -41,8 +41,8 @@
 (defvar ksm_pressure_threshold (* Host.mem_available ksm_free_percent))
 (defvar ksm_committed Host.ksm_shareable)
 
-(if (and (< (+ ksm_pressure_threshold ksm_committed) Host.mem_available)
-         (> (Host.StatAvg "mem_free") ksm_pressure_threshold))
+(if (or (and (< (+ ksm_pressure_threshold ksm_committed) Host.mem_available)
+         (> (Host.StatAvg "mem_free") ksm_pressure_threshold)) (not ksmEnabled))
     (Host.Control "ksm_run" 0)
     {        # else
         (Host.Control "ksm_run" 1)
-- 
1.8.4.2