linux-kernel - [RFC PATCH 8/8] cgroup/cpuset: Update test_cpuset_prs.sh to handle cpuset.cpus.isolation

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Date: Wed, 17 Jan 2024 11:35:11 -0500
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>,
	Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Neeraj Upadhyay <quic_neeraju@...cinc.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Shuah Khan <shuah@...nel.org>
Cc: cgroups@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	rcu@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Mrunal Patel <mpatel@...hat.com>,
	Ryan Phillips <rphillips@...hat.com>,
	Brent Rowsell <browsell@...hat.com>,
	Peter Hunt <pehunt@...hat.com>,
	Cestmir Kalina <ckalina@...hat.com>,
	Nicolas Saenz Julienne <nsaenz@...nel.org>,
	Alex Gladkov <agladkov@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Phil Auld <pauld@...hat.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Daniel Bristot de Oliveira <bristot@...nel.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Costa Shulyupin <cshulyup@...hat.com>,
	Waiman Long <longman@...hat.com>
Subject: [RFC PATCH 8/8] cgroup/cpuset: Update test_cpuset_prs.sh to handle cpuset.cpus.isolation_full

Add a new "-F" option to cpuset.cpus.isolation_full to enable
cpuset.cpus.isolation_full for trying out the effect of enabling
full CPU isolation.

Signed-off-by: Waiman Long <longman@...hat.com>
---
 .../selftests/cgroup/test_cpuset_prs.sh       | 23 ++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/cgroup/test_cpuset_prs.sh b/tools/testing/selftests/cgroup/test_cpuset_prs.sh
index b5eb1be2248c..2a8f0cb8d252 100755
--- a/tools/testing/selftests/cgroup/test_cpuset_prs.sh
+++ b/tools/testing/selftests/cgroup/test_cpuset_prs.sh
@@ -32,6 +32,7 @@ NR_CPUS=$(lscpu | grep "^CPU(s):" | sed -e "s/.*:[[:space:]]*//")
 PROG=$1
 VERBOSE=0
 DELAY_FACTOR=1
+ISOLATION_FULL=
 SCHED_DEBUG=
 while [[ "$1" = -* ]]
 do
@@ -44,7 +45,10 @@ do
 		-d) DELAY_FACTOR=$2
 		    shift
 		    ;;
-		*)  echo "Usage: $PROG [-v] [-d <delay-factor>"
+		-F) ISOLATION_FULL=1
+		    shift
+		    ;;
+		*)  echo "Usage: $PROG [-v] [-d <delay-factor>] [-F]"
 		    exit
 		    ;;
 	esac
@@ -108,6 +112,22 @@ console_msg()
 	pause 0.01
 }
 
+setup_isolation_full()
+{
+	ISOL_FULL=${CGROUP2}/cpuset.cpus.isolation_full
+	if [[ -n "$ISOLATION_FULL" ]]
+	then
+		echo 1 > $ISOL_FULL
+		set -- $(cat $ISOL_FULL)
+		ISOLATION_FLAGS=$2
+		[[ $VERBOSE -gt 0 ]] && {
+			echo "Full CPU isolation flags: $ISOLATION_FLAGS"
+		}
+	else
+		echo 0 > $ISOL_FULL
+	fi
+}
+
 test_partition()
 {
 	EXPECTED_VAL=$1
@@ -930,6 +950,7 @@ test_inotify()
 }
 
 trap cleanup 0 2 3 6
+setup_isolation_full
 run_state_test TEST_MATRIX
 test_isolated
 test_inotify
-- 
2.39.3