From daf02c380515b42db06d9f743070af5ab248a414 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaroslav=20=C5=A0karvada?= <jskarvad@redhat.com>
Date: Fri, 3 Jul 2020 12:17:03 +0200
Subject: [PATCH] scheduler: fix isolated_cores to work with cgroups
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It seems cpuset.cpus needs to be initialized before writing to tasks.

Related: rhbz#1784648

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
---
 tuned/plugins/plugin_scheduler.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tuned/plugins/plugin_scheduler.py b/tuned/plugins/plugin_scheduler.py
index 745ee4a..9ad9f54 100644
--- a/tuned/plugins/plugin_scheduler.py
+++ b/tuned/plugins/plugin_scheduler.py
@@ -106,6 +106,7 @@ class SchedulerPlugin(base.Plugin):
 		# calculated by isolated_cores setter
 		self._affinity = None
 
+		self._cgroup_affinity_initialized = False
 		self._cgroup = None
 		self._cgroups = collections.OrderedDict([(self._sanitize_cgroup_path(option[7:]), self._variables.expand(affinity))
 			for option, affinity in instance.options.items() if option[:7] == "cgroup." and len(option) > 7])
@@ -478,11 +479,14 @@ class SchedulerPlugin(base.Plugin):
 			log.error("Unable to set affinity '%s' for cgroup '%s'" % (affinity, cgroup))
 
 	def _cgroup_set_affinity(self):
+		if self._cgroup_affinity_initialized:
+			return
 		log.debug("Setting cgroups affinities")
 		if self._affinity is not None and self._cgroup is not None and not self._cgroup in self._cgroups:
 			self._cgroup_set_affinity_one(self._cgroup, self._affinity, backup = True)
 		for cg in self._cgroups.items():
 			self._cgroup_set_affinity_one(cg[0], cg[1], backup = True)
+		self._cgroup_affinity_initialized = True
 
 	def _cgroup_restore_affinity(self):
 		log.debug("Restoring cgroups affinities")
@@ -920,6 +924,7 @@ class SchedulerPlugin(base.Plugin):
 			return self._verify_all_irq_affinity(affinity, ignore_missing)
 		elif enabling:
 			if self._cgroup:
+				self._cgroup_set_affinity()
 				ps_affinity = "cgroup.%s" % self._cgroup
 			else:
 				ps_affinity = affinity
-- 
2.25.4

