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Commit 1fd2b442 authored by Frederic Weisbecker's avatar Frederic Weisbecker
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rcu: Userspace RCU extended QS selftest 



Provide a config option that enables the userspace
RCU extended quiescent state on every CPUs by default.

This is for testing purpose.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Alessio Igor Bogani <abogani@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Avi Kivity <avi@redhat.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Max Krasnyansky <maxk@qualcomm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sven-Thorsten Dietrich <thebigcorporation@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent edf55fda

init/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -451,6 +451,14 @@ config RCU_USER_QS 
	  excluded from the global RCU state machine and thus doesn't

	  to keep the timer tick on for RCU.



config RCU_USER_QS_FORCE

	bool "Force userspace extended QS by default"

	depends on RCU_USER_QS

	help

	  Set the hooks in user/kernel boundaries by default in order to

	  test this feature that treats userspace as an extended quiescent

	  state until we have a real user like a full adaptive nohz option.



config RCU_FANOUT

	int "Tree-based hierarchical RCU fanout value"

	range 2 64 if 64BIT

kernel/rcutree.c

+1 −1
Original line number Diff line number Diff line
@@ -206,7 +206,7 @@ EXPORT_SYMBOL_GPL(rcu_note_context_switch); 
DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = {

	.dynticks_nesting = DYNTICK_TASK_EXIT_IDLE,

	.dynticks = ATOMIC_INIT(1),

#ifdef CONFIG_RCU_USER_QS

#if defined(CONFIG_RCU_USER_QS) && !defined(CONFIG_RCU_USER_QS_FORCE)

	.ignore_user_qs = true,

#endif

};