Merge branches 'fixes.2024.04.15a', 'misc.2024.04.12a',...

Merge branches 'fixes.2024.04.15a', 'misc.2024.04.12a', 'rcu-sync-normal-improve.2024.04.15a', 'rcu-tasks.2024.04.15a' and 'rcutorture.2024.04.15a' into rcu-merge.2024.04.15a

fixes.2024.04.15a: RCU fixes
misc.2024.04.12a: Miscellaneous fixes
rcu-sync-normal-improve.2024.04.15a: Improving synchronize_rcu() call
rcu-tasks.2024.04.15a: Tasks RCU updates
rcutorture.2024.04.15a: Torture-test updates

.mailmap

@@ -445,7 +445,8 @@ Nadav Amit <nadav.amit@gmail.com> <namit@cs.technion.ac.il>
 Nadia Yvette Chambers <nyc@holomorphy.com> William Lee Irwin III <wli@holomorphy.com>
 Naoya Horiguchi <naoya.horiguchi@nec.com> <n-horiguchi@ah.jp.nec.com>
 Nathan Chancellor <nathan@kernel.org> <natechancellor@gmail.com>
-Neeraj Upadhyay <quic_neeraju@quicinc.com> <neeraju@codeaurora.org>
+Neeraj Upadhyay <neeraj.upadhyay@kernel.org> <quic_neeraju@quicinc.com>
+Neeraj Upadhyay <neeraj.upadhyay@kernel.org> <neeraju@codeaurora.org>
 Neil Armstrong <neil.armstrong@linaro.org> <narmstrong@baylibre.com>
 Nguyen Anh Quynh <aquynh@gmail.com>
 Nicholas Piggin <npiggin@gmail.com> <npiggen@suse.de>

Documentation/RCU/whatisRCU.rst

@@ -427,7 +427,7 @@ their assorted primitives.
 
 This section shows a simple use of the core RCU API to protect a
 global pointer to a dynamically allocated structure.  More-typical
-uses of RCU may be found in listRCU.rst, arrayRCU.rst, and NMI-RCU.rst.
+uses of RCU may be found in listRCU.rst and NMI-RCU.rst.
 ::
 
 	struct foo {
@@ -510,8 +510,8 @@ So, to sum up:
 	data item.
 
 See checklist.rst for additional rules to follow when using RCU.
-And again, more-typical uses of RCU may be found in listRCU.rst,
-arrayRCU.rst, and NMI-RCU.rst.
+And again, more-typical uses of RCU may be found in listRCU.rst
+and NMI-RCU.rst.
 
 .. _4_whatisRCU:
 

Documentation/admin-guide/kernel-parameters.txt

@@ -5091,6 +5091,20 @@
 			delay, memory pressure or callback list growing too
 			big.
 
+	rcutree.rcu_normal_wake_from_gp= [KNL]
+			Reduces a latency of synchronize_rcu() call. This approach
+			maintains its own track of synchronize_rcu() callers, so it
+			does not interact with regular callbacks because it does not
+			use a call_rcu[_hurry]() path. Please note, this is for a
+			normal grace period.
+
+			How to enable it:
+
+			echo 1 > /sys/module/rcutree/parameters/rcu_normal_wake_from_gp
+			or pass a boot parameter "rcutree.rcu_normal_wake_from_gp=1"
+
+			Default is 0.
+
 	rcuscale.gp_async= [KNL]
 			Measure performance of asynchronous
 			grace-period primitives such as call_rcu().

MAINTAINERS

@@ -18591,7 +18591,7 @@ F:	tools/testing/selftests/resctrl/
 READ-COPY UPDATE (RCU)
 M:	"Paul E. McKenney" <paulmck@kernel.org>
 M:	Frederic Weisbecker <frederic@kernel.org> (kernel/rcu/tree_nocb.h)
-M:	Neeraj Upadhyay <quic_neeraju@quicinc.com> (kernel/rcu/tasks.h)
+M:	Neeraj Upadhyay <neeraj.upadhyay@kernel.org> (kernel/rcu/tasks.h)
 M:	Joel Fernandes <joel@joelfernandes.org>
 M:	Josh Triplett <josh@joshtriplett.org>
 M:	Boqun Feng <boqun.feng@gmail.com>

arch/Kconfig

@@ -55,7 +55,7 @@ config KPROBES
 	depends on MODULES
 	depends on HAVE_KPROBES
 	select KALLSYMS
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 	help
 	  Kprobes allows you to trap at almost any kernel address and
 	  execute a callback function.  register_kprobe() establishes
@@ -104,7 +104,7 @@ config STATIC_CALL_SELFTEST
 config OPTPROBES
 	def_bool y
 	depends on KPROBES && HAVE_OPTPROBES
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 
 config KPROBES_ON_FTRACE
 	def_bool y

include/linux/rcupdate_wait.h

@@ -19,18 +19,18 @@ struct rcu_synchronize {
 };
 void wakeme_after_rcu(struct rcu_head *head);
 
-void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
+void __wait_rcu_gp(bool checktiny, unsigned int state, int n, call_rcu_func_t *crcu_array,
 		   struct rcu_synchronize *rs_array);
 
-#define _wait_rcu_gp(checktiny, ...) \
-do {									\
-	call_rcu_func_t __crcu_array[] = { __VA_ARGS__ };		\
-	struct rcu_synchronize __rs_array[ARRAY_SIZE(__crcu_array)];	\
-	__wait_rcu_gp(checktiny, ARRAY_SIZE(__crcu_array),		\
-			__crcu_array, __rs_array);			\
+#define _wait_rcu_gp(checktiny, state, ...) \
+do {												\
+	call_rcu_func_t __crcu_array[] = { __VA_ARGS__ };					\
+	struct rcu_synchronize __rs_array[ARRAY_SIZE(__crcu_array)];				\
+	__wait_rcu_gp(checktiny, state, ARRAY_SIZE(__crcu_array), __crcu_array, __rs_array);	\
 } while (0)
 
-#define wait_rcu_gp(...) _wait_rcu_gp(false, __VA_ARGS__)
+#define wait_rcu_gp(...) _wait_rcu_gp(false, TASK_UNINTERRUPTIBLE, __VA_ARGS__)
+#define wait_rcu_gp_state(state, ...) _wait_rcu_gp(false, state, __VA_ARGS__)
 
 /**
  * synchronize_rcu_mult - Wait concurrently for multiple grace periods
@@ -54,7 +54,7 @@ do {									\
  * grace period.
  */
 #define synchronize_rcu_mult(...) \
-	_wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), __VA_ARGS__)
+	_wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), TASK_UNINTERRUPTIBLE, __VA_ARGS__)
 
 static inline void cond_resched_rcu(void)
 {

include/trace/events/rcu.h

@@ -707,6 +707,33 @@ TRACE_EVENT_RCU(rcu_invoke_kfree_bulk_callback,
 		__entry->rcuname, __entry->p, __entry->nr_records)
 );
 
+/*
+ * Tracepoint for a normal synchronize_rcu() states. The first argument
+ * is the RCU flavor, the second argument is a pointer to rcu_head the
+ * last one is an event.
+ */
+TRACE_EVENT_RCU(rcu_sr_normal,
+
+	TP_PROTO(const char *rcuname, struct rcu_head *rhp, const char *srevent),
+
+	TP_ARGS(rcuname, rhp, srevent),
+
+	TP_STRUCT__entry(
+		__field(const char *, rcuname)
+		__field(void *, rhp)
+		__field(const char *, srevent)
+	),
+
+	TP_fast_assign(
+		__entry->rcuname = rcuname;
+		__entry->rhp = rhp;
+		__entry->srevent = srevent;
+	),
+
+	TP_printk("%s rhp=0x%p event=%s",
+		__entry->rcuname, __entry->rhp, __entry->srevent)
+);
+
 /*
  * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
  * invoked.  The first argument is the name of the RCU flavor,

kernel/bpf/Kconfig

@@ -28,7 +28,7 @@ config BPF_SYSCALL
 	bool "Enable bpf() system call"
 	select BPF
 	select IRQ_WORK
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 	select TASKS_TRACE_RCU
 	select BINARY_PRINTF
 	select NET_SOCK_MSG if NET

kernel/bpf/trampoline.c

@@ -333,7 +333,7 @@ static void bpf_tramp_image_put(struct bpf_tramp_image *im)
 		int err = bpf_arch_text_poke(im->ip_after_call, BPF_MOD_JUMP,
 					     NULL, im->ip_epilogue);
 		WARN_ON(err);
-		if (IS_ENABLED(CONFIG_PREEMPTION))
+		if (IS_ENABLED(CONFIG_TASKS_RCU))
 			call_rcu_tasks(&im->rcu, __bpf_tramp_image_put_rcu_tasks);
 		else
 			percpu_ref_kill(&im->pcref);

kernel/rcu/rcu.h

@@ -522,12 +522,18 @@ static inline void show_rcu_tasks_gp_kthreads(void) {}
 
 #ifdef CONFIG_TASKS_RCU
 struct task_struct *get_rcu_tasks_gp_kthread(void);
+void rcu_tasks_get_gp_data(int *flags, unsigned long *gp_seq);
 #endif // # ifdef CONFIG_TASKS_RCU
 
 #ifdef CONFIG_TASKS_RUDE_RCU
 struct task_struct *get_rcu_tasks_rude_gp_kthread(void);
+void rcu_tasks_rude_get_gp_data(int *flags, unsigned long *gp_seq);
 #endif // # ifdef CONFIG_TASKS_RUDE_RCU
 
+#ifdef CONFIG_TASKS_TRACE_RCU
+void rcu_tasks_trace_get_gp_data(int *flags, unsigned long *gp_seq);
+#endif
+
 #ifdef CONFIG_TASKS_RCU_GENERIC
 void tasks_cblist_init_generic(void);
 #else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
@@ -557,8 +563,7 @@ static inline void rcu_set_jiffies_lazy_flush(unsigned long j) { }
 #endif
 
 #if defined(CONFIG_TREE_RCU)
-void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
-			    unsigned long *gp_seq);
+void rcutorture_get_gp_data(int *flags, unsigned long *gp_seq);
 void do_trace_rcu_torture_read(const char *rcutorturename,
 			       struct rcu_head *rhp,
 			       unsigned long secs,
@@ -566,8 +571,7 @@ void do_trace_rcu_torture_read(const char *rcutorturename,
 			       unsigned long c);
 void rcu_gp_set_torture_wait(int duration);
 #else
-static inline void rcutorture_get_gp_data(enum rcutorture_type test_type,
-					  int *flags, unsigned long *gp_seq)
+static inline void rcutorture_get_gp_data(int *flags, unsigned long *gp_seq)
 {
 	*flags = 0;
 	*gp_seq = 0;
@@ -587,20 +591,16 @@ static inline void rcu_gp_set_torture_wait(int duration) { }
 
 #ifdef CONFIG_TINY_SRCU
 
-static inline void srcutorture_get_gp_data(enum rcutorture_type test_type,
-					   struct srcu_struct *sp, int *flags,
+static inline void srcutorture_get_gp_data(struct srcu_struct *sp, int *flags,
 					   unsigned long *gp_seq)
 {
-	if (test_type != SRCU_FLAVOR)
-		return;
 	*flags = 0;
 	*gp_seq = sp->srcu_idx;
 }
 
 #elif defined(CONFIG_TREE_SRCU)
 
-void srcutorture_get_gp_data(enum rcutorture_type test_type,
-			     struct srcu_struct *sp, int *flags,
+void srcutorture_get_gp_data(struct srcu_struct *sp, int *flags,
 			     unsigned long *gp_seq);
 
 #endif

kernel/rcu/srcutree.c

@@ -1826,12 +1826,9 @@ static void process_srcu(struct work_struct *work)
 	srcu_reschedule(ssp, curdelay);
 }
 
-void srcutorture_get_gp_data(enum rcutorture_type test_type,
-			     struct srcu_struct *ssp, int *flags,
+void srcutorture_get_gp_data(struct srcu_struct *ssp, int *flags,
 			     unsigned long *gp_seq)
 {
-	if (test_type != SRCU_FLAVOR)
-		return;
 	*flags = 0;
 	*gp_seq = rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq);
 }

kernel/rcu/tasks.h

@@ -74,6 +74,7 @@ struct rcu_tasks_percpu {
  * @holdouts_func: This flavor's holdout-list scan function (optional).
  * @postgp_func: This flavor's post-grace-period function (optional).
  * @call_func: This flavor's call_rcu()-equivalent function.
+ * @wait_state: Task state for synchronous grace-period waits (default TASK_UNINTERRUPTIBLE).
  * @rtpcpu: This flavor's rcu_tasks_percpu structure.
  * @percpu_enqueue_shift: Shift down CPU ID this much when enqueuing callbacks.
  * @percpu_enqueue_lim: Number of per-CPU callback queues in use for enqueuing.
@@ -107,6 +108,7 @@ struct rcu_tasks {
 	holdouts_func_t holdouts_func;
 	postgp_func_t postgp_func;
 	call_rcu_func_t call_func;
+	unsigned int wait_state;
 	struct rcu_tasks_percpu __percpu *rtpcpu;
 	int percpu_enqueue_shift;
 	int percpu_enqueue_lim;
@@ -134,6 +136,7 @@ static struct rcu_tasks rt_name =							\
 	.tasks_gp_mutex = __MUTEX_INITIALIZER(rt_name.tasks_gp_mutex),			\
 	.gp_func = gp,									\
 	.call_func = call,								\
+	.wait_state = TASK_UNINTERRUPTIBLE,						\
 	.rtpcpu = &rt_name ## __percpu,							\
 	.lazy_jiffies = DIV_ROUND_UP(HZ, 4),						\
 	.name = n,									\
@@ -147,7 +150,7 @@ static struct rcu_tasks rt_name =							\
 
 #ifdef CONFIG_TASKS_RCU
 
-/* Report delay in synchronize_srcu() completion in rcu_tasks_postscan(). */
+/* Report delay of scan exiting tasklist in rcu_tasks_postscan(). */
 static void tasks_rcu_exit_srcu_stall(struct timer_list *unused);
 static DEFINE_TIMER(tasks_rcu_exit_srcu_stall_timer, tasks_rcu_exit_srcu_stall);
 #endif
@@ -638,7 +641,7 @@ static void synchronize_rcu_tasks_generic(struct rcu_tasks *rtp)
 
 	// If the grace-period kthread is running, use it.
 	if (READ_ONCE(rtp->kthread_ptr)) {
-		wait_rcu_gp(rtp->call_func);
+		wait_rcu_gp_state(rtp->wait_state, rtp->call_func);
 		return;
 	}
 	rcu_tasks_one_gp(rtp, true);
@@ -1160,6 +1163,7 @@ static int __init rcu_spawn_tasks_kthread(void)
 	rcu_tasks.postscan_func = rcu_tasks_postscan;
 	rcu_tasks.holdouts_func = check_all_holdout_tasks;
 	rcu_tasks.postgp_func = rcu_tasks_postgp;
+	rcu_tasks.wait_state = TASK_IDLE;
 	rcu_spawn_tasks_kthread_generic(&rcu_tasks);
 	return 0;
 }
@@ -1178,6 +1182,13 @@ struct task_struct *get_rcu_tasks_gp_kthread(void)
 }
 EXPORT_SYMBOL_GPL(get_rcu_tasks_gp_kthread);
 
+void rcu_tasks_get_gp_data(int *flags, unsigned long *gp_seq)
+{
+	*flags = 0;
+	*gp_seq = rcu_seq_current(&rcu_tasks.tasks_gp_seq);
+}
+EXPORT_SYMBOL_GPL(rcu_tasks_get_gp_data);
+
 /*
  * Protect against tasklist scan blind spot while the task is exiting and
  * may be removed from the tasklist.  Do this by adding the task to yet
@@ -1199,8 +1210,7 @@ void exit_tasks_rcu_start(void)
 	rtpcp = this_cpu_ptr(rcu_tasks.rtpcpu);
 	t->rcu_tasks_exit_cpu = smp_processor_id();
 	raw_spin_lock_irqsave_rcu_node(rtpcp, flags);
-	if (!rtpcp->rtp_exit_list.next)
-		INIT_LIST_HEAD(&rtpcp->rtp_exit_list);
+	WARN_ON_ONCE(!rtpcp->rtp_exit_list.next);
 	list_add(&t->rcu_tasks_exit_list, &rtpcp->rtp_exit_list);
 	raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags);
 	preempt_enable();
@@ -1358,6 +1368,13 @@ struct task_struct *get_rcu_tasks_rude_gp_kthread(void)
 }
 EXPORT_SYMBOL_GPL(get_rcu_tasks_rude_gp_kthread);
 
+void rcu_tasks_rude_get_gp_data(int *flags, unsigned long *gp_seq)
+{
+	*flags = 0;
+	*gp_seq = rcu_seq_current(&rcu_tasks_rude.tasks_gp_seq);
+}
+EXPORT_SYMBOL_GPL(rcu_tasks_rude_get_gp_data);
+
 #endif /* #ifdef CONFIG_TASKS_RUDE_RCU */
 
 ////////////////////////////////////////////////////////////////////////
@@ -2002,7 +2019,7 @@ void show_rcu_tasks_trace_gp_kthread(void)
 {
 	char buf[64];
 
-	sprintf(buf, "N%lu h:%lu/%lu/%lu",
+	snprintf(buf, sizeof(buf), "N%lu h:%lu/%lu/%lu",
 		data_race(n_trc_holdouts),
 		data_race(n_heavy_reader_ofl_updates),
 		data_race(n_heavy_reader_updates),
@@ -2018,6 +2035,13 @@ struct task_struct *get_rcu_tasks_trace_gp_kthread(void)
 }
 EXPORT_SYMBOL_GPL(get_rcu_tasks_trace_gp_kthread);
 
+void rcu_tasks_trace_get_gp_data(int *flags, unsigned long *gp_seq)
+{
+	*flags = 0;
+	*gp_seq = rcu_seq_current(&rcu_tasks_trace.tasks_gp_seq);
+}
+EXPORT_SYMBOL_GPL(rcu_tasks_trace_get_gp_data);
+
 #else /* #ifdef CONFIG_TASKS_TRACE_RCU */
 static void exit_tasks_rcu_finish_trace(struct task_struct *t) { }
 #endif /* #else #ifdef CONFIG_TASKS_TRACE_RCU */

kernel/rcu/tree.h

@@ -315,6 +315,19 @@ do {									\
 	__set_current_state(TASK_RUNNING);				\
 } while (0)
 
+/*
+ * A max threshold for synchronize_rcu() users which are
+ * awaken directly by the rcu_gp_kthread(). Left part is
+ * deferred to the main worker.
+ */
+#define SR_MAX_USERS_WAKE_FROM_GP 5
+#define SR_NORMAL_GP_WAIT_HEAD_MAX 5
+
+struct sr_wait_node {
+	atomic_t inuse;
+	struct llist_node node;
+};
+
 /*
  * RCU global state, including node hierarchy.  This hierarchy is
  * represented in "heap" form in a dense array.  The root (first level)
@@ -400,6 +413,13 @@ struct rcu_state {
 						/* Synchronize offline with */
 						/*  GP pre-initialization. */
 	int nocb_is_setup;			/* nocb is setup from boot */
+
+	/* synchronize_rcu() part. */
+	struct llist_head srs_next;	/* request a GP users. */
+	struct llist_node *srs_wait_tail; /* wait for GP users. */
+	struct llist_node *srs_done_tail; /* ready for GP users. */
+	struct sr_wait_node srs_wait_nodes[SR_NORMAL_GP_WAIT_HEAD_MAX];
+	struct work_struct srs_cleanup_work;
 };
 
 /* Values for rcu_state structure's gp_flags field. */

kernel/rcu/tree_exp.h

@@ -930,7 +930,7 @@ void synchronize_rcu_expedited(void)
 
 	/* If expedited grace periods are prohibited, fall back to normal. */
 	if (rcu_gp_is_normal()) {
-		wait_rcu_gp(call_rcu_hurry);
+		synchronize_rcu_normal();
 		return;
 	}
 

kernel/rcu/update.c

@@ -408,7 +408,7 @@ void wakeme_after_rcu(struct rcu_head *head)
 }
 EXPORT_SYMBOL_GPL(wakeme_after_rcu);
 
-void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
+void __wait_rcu_gp(bool checktiny, unsigned int state, int n, call_rcu_func_t *crcu_array,
 		   struct rcu_synchronize *rs_array)
 {
 	int i;
@@ -440,7 +440,7 @@ void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
 			if (crcu_array[j] == crcu_array[i])
 				break;
 		if (j == i) {
-			wait_for_completion(&rs_array[i].completion);
+			wait_for_completion_state(&rs_array[i].completion, state);
 			destroy_rcu_head_on_stack(&rs_array[i].head);
 		}
 	}

kernel/trace/Kconfig

@@ -163,7 +163,7 @@ config TRACING
 	select BINARY_PRINTF
 	select EVENT_TRACING
 	select TRACE_CLOCK
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 
 config GENERIC_TRACER
 	bool
@@ -204,7 +204,7 @@ config FUNCTION_TRACER
 	select GENERIC_TRACER
 	select CONTEXT_SWITCH_TRACER
 	select GLOB
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 	select TASKS_RUDE_RCU
 	help
 	  Enable the kernel to trace every kernel function. This is done

kernel/trace/ftrace.c

@@ -3157,8 +3157,7 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
 		 * synchronize_rcu_tasks() will wait for those tasks to
 		 * execute and either schedule voluntarily or enter user space.
 		 */
-		if (IS_ENABLED(CONFIG_PREEMPTION))
-			synchronize_rcu_tasks();
+		synchronize_rcu_tasks();
 
 		ftrace_trampoline_free(ops);
 	}

tools/testing/selftests/rcutorture/bin/torture.sh

@@ -391,7 +391,7 @@ __EOF__
 		forceflavor="`echo $flavor | sed -e 's/^CONFIG/CONFIG_FORCE/'`"
 		deselectedflavors="`grep -v $flavor $T/rcutasksflavors | tr '\012' ' ' | tr -s ' ' | sed -e 's/ *$//'`"
 		echo " --- Running RCU Tasks Trace flavor $flavor `date`" >> $rtfdir/log
-		tools/testing/selftests/rcutorture/bin/kvm.sh --datestamp "$ds/results-rcutasksflavors/$flavor" --buildonly --configs "TINY01 TREE04" --kconfig "CONFIG_RCU_EXPERT=y CONFIG_RCU_SCALE_TEST=y $forceflavor=y $deselectedflavors" --trust-make > $T/$flavor.out 2>&1
+		tools/testing/selftests/rcutorture/bin/kvm.sh --datestamp "$ds/results-rcutasksflavors/$flavor" --buildonly --configs "TINY01 TREE04" --kconfig "CONFIG_RCU_EXPERT=y CONFIG_RCU_SCALE_TEST=y CONFIG_KPROBES=n CONFIG_RCU_TRACE=n CONFIG_TRACING=n CONFIG_BLK_DEV_IO_TRACE=n CONFIG_UPROBE_EVENTS=n $forceflavor=y $deselectedflavors" --trust-make > $T/$flavor.out 2>&1
 		retcode=$?
 		if test "$retcode" -ne 0
 		then
@@ -425,7 +425,7 @@ fi
 if test "$do_scftorture" = "yes"
 then
 	# Scale memory based on the number of CPUs.
-	scfmem=$((2+HALF_ALLOTED_CPUS/16))
+	scfmem=$((3+HALF_ALLOTED_CPUS/16))
 	torture_bootargs="scftorture.nthreads=$HALF_ALLOTED_CPUS torture.disable_onoff_at_boot csdlock_debug=1"
 	torture_set "scftorture" tools/testing/selftests/rcutorture/bin/kvm.sh --torture scf --allcpus --duration "$duration_scftorture" --configs "$configs_scftorture" --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory ${scfmem}G --trust-make
 fi
@@ -559,7 +559,7 @@ do_kcsan="$do_kcsan_save"
 if test "$do_kvfree" = "yes"
 then
 	torture_bootargs="rcuscale.kfree_rcu_test=1 rcuscale.kfree_nthreads=16 rcuscale.holdoff=20 rcuscale.kfree_loops=10000 torture.disable_onoff_at_boot"
-	torture_set "rcuscale-kvfree" tools/testing/selftests/rcutorture/bin/kvm.sh --torture rcuscale --allcpus --duration 10 --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory 2G --trust-make
+	torture_set "rcuscale-kvfree" tools/testing/selftests/rcutorture/bin/kvm.sh --torture rcuscale --allcpus --duration $duration_rcutorture --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory 2G --trust-make
 fi
 
 if test "$do_clocksourcewd" = "yes"

tools/testing/selftests/rcutorture/configs/rcu/TREE09

@@ -10,8 +10,9 @@ CONFIG_NO_HZ_FULL=n
 CONFIG_RCU_TRACE=n
 CONFIG_RCU_NOCB_CPU=n
 CONFIG_DEBUG_LOCK_ALLOC=n
-CONFIG_RCU_BOOST=n
+CONFIG_RCU_BOOST=y
+CONFIG_RCU_BOOST_DELAY=100
 CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
-#CHECK#CONFIG_RCU_EXPERT=n
+CONFIG_RCU_EXPERT=y
 CONFIG_KPROBES=n
 CONFIG_FTRACE=n