refperf: Rename RCU_REF_PERF_TEST to RCU_REF_SCALE_TEST

The old Kconfig option name is all too easy to conflate with the
unrelated "perf" feature, so this commit renames RCU_REF_PERF_TEST to
RCU_REF_SCALE_TEST.
Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

kernel/rcu/Kconfig.debug

@@ -61,8 +61,8 @@ config RCU_TORTURE_TEST
 	  Say M if you want the RCU torture tests to build as a module.
 	  Say N if you are unsure.
 
-config RCU_REF_PERF_TEST
-	tristate "Performance tests for read-side synchronization (RCU and others)"
+config RCU_REF_SCALE_TEST
+	tristate "Scalability tests for read-side synchronization (RCU and others)"
 	depends on DEBUG_KERNEL
 	select TORTURE_TEST
 	select SRCU

kernel/rcu/Makefile

@@ -12,7 +12,7 @@ obj-$(CONFIG_TREE_SRCU) += srcutree.o
 obj-$(CONFIG_TINY_SRCU) += srcutiny.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_RCU_PERF_TEST) += rcuperf.o
-obj-$(CONFIG_RCU_REF_PERF_TEST) += refperf.o
+obj-$(CONFIG_RCU_REF_SCALE_TEST) += refperf.o
 obj-$(CONFIG_TREE_RCU) += tree.o
 obj-$(CONFIG_TINY_RCU) += tiny.o
 obj-$(CONFIG_RCU_NEED_SEGCBLIST) += rcu_segcblist.o

kernel/rcu/refperf.c

 // SPDX-License-Identifier: GPL-2.0+
 //
-// Performance test comparing RCU vs other mechanisms
+// Scalability test comparing RCU vs other mechanisms
 // for acquiring references on objects.
 //
 // Copyright (C) Google, 2020.
@@ -59,7 +59,7 @@ MODULE_PARM_DESC(perf_type, "Type of test (rcu, srcu, refcnt, rwsem, rwlock.");
 torture_param(int, verbose, 0, "Enable verbose debugging printk()s");
 
 // Wait until there are multiple CPUs before starting test.
-torture_param(int, holdoff, IS_BUILTIN(CONFIG_RCU_REF_PERF_TEST) ? 10 : 0,
+torture_param(int, holdoff, IS_BUILTIN(CONFIG_RCU_REF_SCALE_TEST) ? 10 : 0,
 	      "Holdoff time before test start (s)");
 // Number of loops per experiment, all readers execute operations concurrently.
 torture_param(long, loops, 10000, "Number of loops per experiment.");
@@ -656,7 +656,7 @@ ref_perf_init(void)
 		for (i = 0; i < ARRAY_SIZE(perf_ops); i++)
 			pr_cont(" %s", perf_ops[i]->name);
 		pr_cont("\n");
-		WARN_ON(!IS_MODULE(CONFIG_RCU_REF_PERF_TEST));
+		WARN_ON(!IS_MODULE(CONFIG_RCU_REF_SCALE_TEST));
 		firsterr = -EINVAL;
 		cur_ops = NULL;
 		goto unwind;

tools/testing/selftests/rcutorture/configs/refperf/CFcommon

-CONFIG_RCU_REF_PERF_TEST=y
+CONFIG_RCU_REF_SCALE_TEST=y
 CONFIG_PRINTK_TIME=y