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 <[email protected]> Cc: Alessio Igor Bogani <[email protected]> Cc: Andrew Morton <[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: Ingo Molnar <[email protected]> Cc: Li Zhong <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Paul Gortmaker <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Thomas Gleixner <[email protected]> Signed-off-by: Steven Rostedt <[email protected]> --- 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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
