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From 837c6bd12a5eedc3fbf46291bf1040e724786efd Mon Sep 17 00:00:00 2001
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From: Marcelo Tosatti <mtosatti@redhat.com>
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Date: Fri, 31 Aug 2018 13:27:12 +0200
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Subject: [PATCH] start/stop rt-entsk daemon on initialization/shutdown
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The rt-entsk application, part of newer rt-setup packages,
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worksaround a latency issue with static key
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IPI's. What it does it:
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/*
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* Open a socket, and enable timestamping on it.
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*
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* This is to avoid Chrony from changing timestamping
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* user count from 0->1 and vice-versa, causing
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* static key enable/disable IPIs.
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*
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*/
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Start/stop the systemctl service from the realtime-virtual-host
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and realtime-virtual-guest profiles.
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Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
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---
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profiles/realtime-virtual-guest/script.sh | 19 +++++++++++++++++++
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profiles/realtime-virtual-guest/tuned.conf | 3 +++
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profiles/realtime-virtual-host/script.sh | 2 ++
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3 files changed, 24 insertions(+)
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create mode 100755 profiles/realtime-virtual-guest/script.sh
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diff --git a/profiles/realtime-virtual-guest/script.sh b/profiles/realtime-virtual-guest/script.sh
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new file mode 100755
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index 0000000..33cb730
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--- /dev/null
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+++ b/profiles/realtime-virtual-guest/script.sh
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@@ -0,0 +1,19 @@
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+#!/bin/sh
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+
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+. /usr/lib/tuned/functions
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+
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+start() {
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+ systemctl start rt-entsk
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+ return "$?"
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+}
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+
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+stop() {
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+ systemctl stop rt-entsk
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+ return "$?"
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+}
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+
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+verify() {
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+ return "$?"
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+}
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+
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+process $@
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diff --git a/profiles/realtime-virtual-guest/tuned.conf b/profiles/realtime-virtual-guest/tuned.conf
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index fb2bc42..8e1f67e 100644
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--- a/profiles/realtime-virtual-guest/tuned.conf
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+++ b/profiles/realtime-virtual-guest/tuned.conf
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@@ -36,5 +36,8 @@ group.ktimersoftd=0:f:3:*:ktimersoftd.*
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ps_blacklist=ksoftirqd.*;rcuc.*;rcub.*;ktimersoftd.*
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+[script]
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+script=${i:PROFILE_DIR}/script.sh
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+
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[bootloader]
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cmdline_rvg=+nohz=on nohz_full=${isolated_cores} rcu_nocbs=${isolated_cores}
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diff --git a/profiles/realtime-virtual-host/script.sh b/profiles/realtime-virtual-host/script.sh
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index 515d254..a9366cb 100755
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--- a/profiles/realtime-virtual-host/script.sh
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+++ b/profiles/realtime-virtual-host/script.sh
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@@ -87,6 +87,7 @@ start() {
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if [ -f $CACHE_VALUE_FILE ]; then
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echo `cat $CACHE_VALUE_FILE` > $KVM_LAPIC_FILE
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fi
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+ systemctl start rt-entsk
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return 0
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}
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@@ -94,6 +95,7 @@ start() {
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stop() {
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[ "$1" = "full_rollback" ] && teardown_kvm_mod_low_latency
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enable_ksm
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+ systemctl stop rt-entsk
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return "$?"
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}
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--
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2.14.4
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