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: Frederic Weisbecker <fweis...@gmail.com> Cc: Alessio Igor Bogani <abog...@kernel.org> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Avi Kivity <a...@redhat.com> Cc: Chris Metcalf <cmetc...@tilera.com> Cc: Christoph Lameter <c...@linux.com> Cc: Geoff Levand <ge...@infradead.org> Cc: Gilad Ben Yossef <gi...@benyossef.com> Cc: Hakan Akkan <hakanak...@gmail.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Ingo Molnar <mi...@kernel.org> Cc: Josh Triplett <j...@joshtriplett.org> Cc: Kevin Hilman <khil...@ti.com> Cc: Max Krasnyansky <m...@qualcomm.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Stephen Hemminger <shemmin...@vyatta.com> Cc: Steven Rostedt <rost...@goodmis.org> Cc: Sven-Thorsten Dietrich <thebigcorporat...@gmail.com> Cc: Thomas Gleixner <t...@linutronix.de> --- init/Kconfig | 8 ++++++++ kernel/rcutree.c | 2 +- 2 files changed, 9 insertions(+), 1 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index 3a4af8f..7d1db2e 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -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 diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 2d79308..9427aba 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -209,7 +209,7 @@ 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 }; -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/