Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH 10/27] rcu: Restart the tick on non-responding full dynticks CPUs | Date | Sat, 29 Dec 2012 17:42:49 +0100 |
| |
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 <fweisbec@gmail.com> Cc: Alessio Igor Bogani <abogani@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Christoph Lameter <cl@linux.com> Cc: Geoff Levand <geoff@infradead.org> Cc: Gilad Ben Yossef <gilad@benyossef.com> Cc: Hakan Akkan <hakanakkan@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Steven Rostedt <rostedt@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
| |