On Thu, Aug 30, 2012 at 02:05:31PM -0700, Paul E. McKenney wrote: > From: Frederic Weisbecker <[email protected]> > > 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 <[email protected]> > Cc: Alessio Igor Bogani <[email protected]> > Cc: Andrew Morton <[email protected]> > Cc: Avi Kivity <[email protected]> > Cc: Chris Metcalf <[email protected]> > Cc: Christoph Lameter <[email protected]> > Cc: Geoff Levand <[email protected]> > Cc: Gilad Ben Yossef <[email protected]> > Cc: Hakan Akkan <[email protected]> > Cc: H. Peter Anvin <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: Josh Triplett <[email protected]> > Cc: Kevin Hilman <[email protected]> > Cc: Max Krasnyansky <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Cc: Stephen Hemminger <[email protected]> > Cc: Steven Rostedt <[email protected]> > Cc: Sven-Thorsten Dietrich <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Josh Triplett <[email protected]> > init/Kconfig | 8 ++++++++ > kernel/rcutree.c | 2 +- > 2 files changed, 9 insertions(+), 1 deletions(-) > > diff --git a/init/Kconfig b/init/Kconfig > index f6a1830..c26b8a1 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 af92681..ccf3cbf 100644 > --- a/kernel/rcutree.c > +++ b/kernel/rcutree.c > @@ -210,7 +210,7 @@ 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 > }; > -- > 1.7.8 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
