When a CPU in full dynticks mode doesn't respond to complete a grace period, issue it a specific IPI so that it restarts the tick and chases a quiescent state.
Signed-off-by: Frederic Weisbecker <fweis...@gmail.com> Cc: Alessio Igor Bogani <abog...@kernel.org> Cc: Andrew Morton <a...@linux-foundation.org> 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: Ingo Molnar <mi...@kernel.org> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortma...@windriver.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Steven Rostedt <rost...@goodmis.org> Cc: Thomas Gleixner <t...@linutronix.de> Signed-off-by: Steven Rostedt <rost...@goodmis.org> --- kernel/rcutree.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index e441b77..302d360 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -53,6 +53,7 @@ #include <linux/delay.h> #include <linux/stop_machine.h> #include <linux/random.h> +#include <linux/tick.h> #include "rcutree.h" #include <trace/events/rcu.h> @@ -743,6 +744,12 @@ static int dyntick_save_progress_counter(struct rcu_data *rdp) return (rdp->dynticks_snap & 0x1) == 0; } +static void rcu_kick_nohz_cpu(int cpu) +{ + if (tick_nohz_full_cpu(cpu)) + smp_send_reschedule(cpu); +} + /* * Return true if the specified CPU has passed through a quiescent * state by virtue of being in or having passed through an dynticks @@ -790,6 +797,9 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp) rdp->offline_fqs++; return 1; } + + rcu_kick_nohz_cpu(rdp->cpu); + return 0; } -- 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/