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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-02-26 16:38:58 -0800
committerIngo Molnar <mingo@elte.hu>2010-02-27 09:53:53 +0100
commit71da81324c83ef65bb196c7f874ac1c6996d8287 (patch)
treeb470c5769ad88d2e2af8fe25cc84e7df85fb3d7c
parent0b1c87278a8c7e394022ec184a0b44a3886b6fde (diff)
rcu: Fix accelerated GPs for last non-dynticked CPU
This patch disables irqs across the call to rcu_needs_cpu(). It also enforces a hold-off period so that the idle loop doesn't softirq itself to death when there are lots of RCU callbacks in flight on the last non-dynticked CPU. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1267231138-27856-3-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/rcutree_plugin.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index ed241fc478f0..464ad2cdee00 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -986,6 +986,7 @@ static void rcu_needs_cpu_flush(void)
#define RCU_NEEDS_CPU_FLUSHES 5
static DEFINE_PER_CPU(int, rcu_dyntick_drain);
+static DEFINE_PER_CPU(unsigned long, rcu_dyntick_holdoff);
/*
* Check to see if any future RCU-related work will need to be done
@@ -1013,6 +1014,7 @@ int rcu_needs_cpu(int cpu)
for_each_cpu_not(thatcpu, nohz_cpu_mask)
if (thatcpu != cpu) {
per_cpu(rcu_dyntick_drain, cpu) = 0;
+ per_cpu(rcu_dyntick_holdoff, cpu) = jiffies - 1;
return rcu_needs_cpu_quick_check(cpu);
}
@@ -1022,6 +1024,7 @@ int rcu_needs_cpu(int cpu)
per_cpu(rcu_dyntick_drain, cpu) = RCU_NEEDS_CPU_FLUSHES;
} else if (--per_cpu(rcu_dyntick_drain, cpu) <= 0) {
/* We have hit the limit, so time to give up. */
+ per_cpu(rcu_dyntick_holdoff, cpu) = jiffies;
return rcu_needs_cpu_quick_check(cpu);
}
@@ -1038,8 +1041,10 @@ int rcu_needs_cpu(int cpu)
}
/* If RCU callbacks are still pending, RCU still needs this CPU. */
- if (c)
+ if (c) {
raise_softirq(RCU_SOFTIRQ);
+ per_cpu(rcu_dyntick_holdoff, cpu) = jiffies;
+ }
return c;
}
@@ -1050,10 +1055,13 @@ int rcu_needs_cpu(int cpu)
static void rcu_needs_cpu_flush(void)
{
int cpu = smp_processor_id();
+ unsigned long flags;
if (per_cpu(rcu_dyntick_drain, cpu) <= 0)
return;
+ local_irq_save(flags);
(void)rcu_needs_cpu(cpu);
+ local_irq_restore(flags);
}
#endif /* #else #if !defined(CONFIG_RCU_FAST_NO_HZ) */