From: Frederic Weisbecker <[email protected]> When a CPU in adaptive nohz 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: Avi Kivity <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Daniel Lezcano <[email protected]> Cc: Geoff Levand <[email protected]> Cc: Gilad Ben Yossef <[email protected]> Cc: Hakan Akkan <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Kevin Hilman <[email protected]> Cc: Max Krasnyansky <[email protected]> Cc: Paul E. McKenney <[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: Steven Rostedt <[email protected]> --- kernel/rcutree.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 0dca81f..21664a3 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/cpuset.h> #include "rcutree.h" #include <trace/events/rcu.h> @@ -798,6 +799,20 @@ static int dyntick_save_progress_counter(struct rcu_data *rdp) return (rdp->dynticks_snap & 0x1) == 0; } +static void cpuset_update_rcu_cpu(int cpu) +{ +#ifdef CONFIG_CPUSETS_NO_HZ + unsigned long flags; + + local_irq_save(flags); + + if (cpuset_cpu_adaptive_nohz(cpu)) + smp_cpuset_update_nohz(cpu); + + local_irq_restore(flags); +#endif +} + /* * Return true if the specified CPU has passed through a quiescent * state by virtue of being in or having passed through an dynticks @@ -845,6 +860,9 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp) rdp->offline_fqs++; return 1; } + + cpuset_update_rcu_cpu(rdp->cpu); + return 0; } -- 1.7.10.4 -- 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/
