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Message-Id: <1356799386-4212-11-git-send-email-fweisbec@gmail.com> Date: Sat, 29 Dec 2012 17:42:49 +0100 From: Frederic Weisbecker <fweisbec@...il.com> To: LKML <linux-kernel@...r.kernel.org> Cc: Frederic Weisbecker <fweisbec@...il.com>, Alessio Igor Bogani <abogani@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Chris Metcalf <cmetcalf@...era.com>, Christoph Lameter <cl@...ux.com>, Geoff Levand <geoff@...radead.org>, Gilad Ben Yossef <gilad@...yossef.com>, Hakan Akkan <hakanakkan@...il.com>, Ingo Molnar <mingo@...nel.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Paul Gortmaker <paul.gortmaker@...driver.com>, Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, Thomas Gleixner <tglx@...utronix.de> Subject: [PATCH 10/27] rcu: Restart the tick on non-responding full dynticks CPUs 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@...il.com> Cc: Alessio Igor Bogani <abogani@...nel.org> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Chris Metcalf <cmetcalf@...era.com> Cc: Christoph Lameter <cl@...ux.com> Cc: Geoff Levand <geoff@...radead.org> Cc: Gilad Ben Yossef <gilad@...yossef.com> Cc: Hakan Akkan <hakanakkan@...il.com> Cc: Ingo Molnar <mingo@...nel.org> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@...driver.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Steven Rostedt <rostedt@...dmis.org> Cc: Thomas Gleixner <tglx@...utronix.de> Signed-off-by: Steven Rostedt <rostedt@...dmis.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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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