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authorLinus Torvalds <torvalds@linux-foundation.org>2014-01-31 18:02:51 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-31 18:02:51 +0100
commitaafd9d6a46745926648cb5d0b68b108e79ceb8d4 (patch)
treeb099dece2ff08e57d141af686ffbb24dc663c05b /kernel
parentMerge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/k... (diff)
parentMerge branch 'timers/core' of git://git.kernel.org/pub/scm/linux/kernel/git/f... (diff)
downloadlinux-aafd9d6a46745926648cb5d0b68b108e79ceb8d4.tar.xz
linux-aafd9d6a46745926648cb5d0b68b108e79ceb8d4.zip
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer/dynticks updates from Ingo Molnar: "This tree contains misc dynticks updates: a fix and three cleanups" * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/nohz: Fix overflow error in scheduler_tick_max_deferment() nohz_full: fix code style issue of tick_nohz_full_stop_tick nohz: Get timekeeping max deferment outside jiffies_lock tick: Rename tick_check_idle() to tick_irq_enter()
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c2
-rw-r--r--kernel/softirq.c2
-rw-r--r--kernel/time/tick-sched.c27
3 files changed, 16 insertions, 15 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 656cd70eb577..b46131ef6aab 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2476,7 +2476,7 @@ u64 scheduler_tick_max_deferment(void)
if (time_before_eq(next, now))
return 0;
- return jiffies_to_usecs(next - now) * NSEC_PER_USEC;
+ return jiffies_to_nsecs(next - now);
}
#endif
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 850967068aaf..490fcbb1dc5b 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -328,7 +328,7 @@ void irq_enter(void)
* here, as softirq will be serviced on return from interrupt.
*/
local_bh_disable();
- tick_check_idle();
+ tick_irq_enter();
_local_bh_enable();
}
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 08cb0c3b8ccb..9f8af69c67ec 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -533,12 +533,13 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
u64 time_delta;
+ time_delta = timekeeping_max_deferment();
+
/* Read jiffies and the time when jiffies were updated last */
do {
seq = read_seqbegin(&jiffies_lock);
last_update = last_jiffies_update;
last_jiffies = jiffies;
- time_delta = timekeeping_max_deferment();
} while (read_seqretry(&jiffies_lock, seq));
if (rcu_needs_cpu(cpu, &rcu_delta_jiffies) ||
@@ -678,18 +679,18 @@ out:
static void tick_nohz_full_stop_tick(struct tick_sched *ts)
{
#ifdef CONFIG_NO_HZ_FULL
- int cpu = smp_processor_id();
+ int cpu = smp_processor_id();
- if (!tick_nohz_full_cpu(cpu) || is_idle_task(current))
- return;
+ if (!tick_nohz_full_cpu(cpu) || is_idle_task(current))
+ return;
- if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)
- return;
+ if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)
+ return;
- if (!can_stop_full_tick())
- return;
+ if (!can_stop_full_tick())
+ return;
- tick_nohz_stop_sched_tick(ts, ktime_get(), cpu);
+ tick_nohz_stop_sched_tick(ts, ktime_get(), cpu);
#endif
}
@@ -1023,7 +1024,7 @@ static void tick_nohz_kick_tick(struct tick_sched *ts, ktime_t now)
#endif
}
-static inline void tick_check_nohz_this_cpu(void)
+static inline void tick_nohz_irq_enter(void)
{
struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
ktime_t now;
@@ -1042,17 +1043,17 @@ static inline void tick_check_nohz_this_cpu(void)
#else
static inline void tick_nohz_switch_to_nohz(void) { }
-static inline void tick_check_nohz_this_cpu(void) { }
+static inline void tick_nohz_irq_enter(void) { }
#endif /* CONFIG_NO_HZ_COMMON */
/*
* Called from irq_enter to notify about the possible interruption of idle()
*/
-void tick_check_idle(void)
+void tick_irq_enter(void)
{
tick_check_oneshot_broadcast_this_cpu();
- tick_check_nohz_this_cpu();
+ tick_nohz_irq_enter();
}
/*