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Date: Tue, 1 May 2012 01:54:51 +0200 From: Frederic Weisbecker <fweisbec@...il.com> To: LKML <linux-kernel@...r.kernel.org>, linaro-sched-sig@...ts.linaro.org Cc: Frederic Weisbecker <fweisbec@...il.com>, Alessio Igor Bogani <abogani@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Avi Kivity <avi@...hat.com>, Chris Metcalf <cmetcalf@...era.com>, Christoph Lameter <cl@...ux.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, Geoff Levand <geoff@...radead.org>, Gilad Ben Yossef <gilad@...yossef.com>, Hakan Akkan <hakanakkan@...il.com>, Ingo Molnar <mingo@...nel.org>, Kevin Hilman <khilman@...com>, Max Krasnyansky <maxk@...lcomm.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Peter Zijlstra <peterz@...radead.org>, Stephen Hemminger <shemminger@...tta.com>, Steven Rostedt <rostedt@...dmis.org>, Sven-Thorsten Dietrich <thebigcorporation@...il.com>, Thomas Gleixner <tglx@...utronix.de> Subject: [PATCH 17/41] rcu: Restart tick if we enqueue a callback in a nohz/cpuset CPU If we enqueue an rcu callback, we need the CPU tick to stay alive until we take care of those by completing the appropriate grace period. Thus, when we call_rcu(), send a self IPI that checks rcu_needs_cpu() so that we restore a periodic tick behaviour that can take care of everything. Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> Cc: Alessio Igor Bogani <abogani@...nel.org> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Avi Kivity <avi@...hat.com> Cc: Chris Metcalf <cmetcalf@...era.com> Cc: Christoph Lameter <cl@...ux.com> Cc: Daniel Lezcano <daniel.lezcano@...aro.org> 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: Kevin Hilman <khilman@...com> Cc: Max Krasnyansky <maxk@...lcomm.com> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Stephen Hemminger <shemminger@...tta.com> Cc: Steven Rostedt <rostedt@...dmis.org> Cc: Sven-Thorsten Dietrich <thebigcorporation@...il.com> Cc: Thomas Gleixner <tglx@...utronix.de> --- kernel/rcutree.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 3fffc26..b8d300c 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1749,6 +1749,13 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu), else trace_rcu_callback(rsp->name, head, rdp->qlen); + /* Restart the timer if needed to handle the callbacks */ + if (cpuset_adaptive_nohz()) { + /* Make updates on nxtlist visible to self IPI */ + barrier(); + smp_cpuset_update_nohz(smp_processor_id()); + } + /* If interrupts were disabled, don't dive into RCU core. */ if (irqs_disabled_flags(flags)) { local_irq_restore(flags); -- 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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