From 837c6bd12a5eedc3fbf46291bf1040e724786efd Mon Sep 17 00:00:00 2001
From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Fri, 31 Aug 2018 13:27:12 +0200
Subject: [PATCH] start/stop rt-entsk daemon on initialization/shutdown
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The rt-entsk application, part of newer rt-setup packages,
worksaround a latency issue with static key
IPI's. What it does it:

/*
 * Open a socket, and enable timestamping on it.
 *
 * This is to avoid Chrony from changing timestamping
 * user count from 0->1 and vice-versa, causing
 * static key enable/disable IPIs.
 *
 */

Start/stop the systemctl service from the realtime-virtual-host
and realtime-virtual-guest profiles.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
---
 profiles/realtime-virtual-guest/script.sh  | 19 +++++++++++++++++++
 profiles/realtime-virtual-guest/tuned.conf |  3 +++
 profiles/realtime-virtual-host/script.sh   |  2 ++
 3 files changed, 24 insertions(+)
 create mode 100755 profiles/realtime-virtual-guest/script.sh

diff --git a/profiles/realtime-virtual-guest/script.sh b/profiles/realtime-virtual-guest/script.sh
new file mode 100755
index 0000000..33cb730
--- /dev/null
+++ b/profiles/realtime-virtual-guest/script.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+. /usr/lib/tuned/functions
+
+start() {
+    systemctl start rt-entsk
+    return "$?"
+}
+
+stop() {
+    systemctl stop rt-entsk
+    return "$?"
+}
+
+verify() {
+    return "$?"
+}
+
+process $@
diff --git a/profiles/realtime-virtual-guest/tuned.conf b/profiles/realtime-virtual-guest/tuned.conf
index fb2bc42..8e1f67e 100644
--- a/profiles/realtime-virtual-guest/tuned.conf
+++ b/profiles/realtime-virtual-guest/tuned.conf
@@ -36,5 +36,8 @@ group.ktimersoftd=0:f:3:*:ktimersoftd.*
 
 ps_blacklist=ksoftirqd.*;rcuc.*;rcub.*;ktimersoftd.*
 
+[script]
+script=${i:PROFILE_DIR}/script.sh
+
 [bootloader]
 cmdline_rvg=+nohz=on nohz_full=${isolated_cores} rcu_nocbs=${isolated_cores}
diff --git a/profiles/realtime-virtual-host/script.sh b/profiles/realtime-virtual-host/script.sh
index 515d254..a9366cb 100755
--- a/profiles/realtime-virtual-host/script.sh
+++ b/profiles/realtime-virtual-host/script.sh
@@ -87,6 +87,7 @@ start() {
     if [ -f $CACHE_VALUE_FILE ]; then
         echo `cat $CACHE_VALUE_FILE` > $KVM_LAPIC_FILE
     fi
+    systemctl start rt-entsk
 
     return 0
 }
@@ -94,6 +95,7 @@ start() {
 stop() {
     [ "$1" = "full_rollback" ] && teardown_kvm_mod_low_latency
     enable_ksm
+    systemctl stop rt-entsk
     return "$?"
 }
 
-- 
2.14.4