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-rw-r--r--Documentation/RCU/stallwarn.txt2
-rw-r--r--Documentation/cpu-freq/governors.txt4
-rw-r--r--arch/um/include/shared/common-offsets.h4
-rw-r--r--arch/um/os-Linux/time.c2
-rw-r--r--include/linux/sched.h8
-rw-r--r--include/linux/tick.h8
-rw-r--r--init/Kconfig2
-rw-r--r--kernel/hrtimer.c4
-rw-r--r--kernel/sched/core.c18
-rw-r--r--kernel/sched/fair.c10
-rw-r--r--kernel/sched/sched.h4
-rw-r--r--kernel/softirq.c2
-rw-r--r--kernel/time/Kconfig13
-rw-r--r--kernel/time/tick-sched.c12
-rw-r--r--kernel/timer.c4
15 files changed, 51 insertions, 46 deletions
diff --git a/Documentation/RCU/stallwarn.txt b/Documentation/RCU/stallwarn.txt
index 1927151b386b..b336755b71ed 100644
--- a/Documentation/RCU/stallwarn.txt
+++ b/Documentation/RCU/stallwarn.txt
@@ -176,7 +176,7 @@ o A CPU-bound real-time task in a CONFIG_PREEMPT_RT kernel that
o A hardware or software issue shuts off the scheduler-clock
interrupt on a CPU that is not in dyntick-idle mode. This
problem really has happened, and seems to be most likely to
- result in RCU CPU stall warnings for CONFIG_NO_HZ=n kernels.
+ result in RCU CPU stall warnings for CONFIG_NO_HZ_COMMON=n kernels.
o A bug in the RCU implementation.
diff --git a/Documentation/cpu-freq/governors.txt b/Documentation/cpu-freq/governors.txt
index c7a2eb8450c2..e3e5d9ae50cd 100644
--- a/Documentation/cpu-freq/governors.txt
+++ b/Documentation/cpu-freq/governors.txt
@@ -131,8 +131,8 @@ sampling_rate_min:
The sampling rate is limited by the HW transition latency:
transition_latency * 100
Or by kernel restrictions:
-If CONFIG_NO_HZ is set, the limit is 10ms fixed.
-If CONFIG_NO_HZ is not set or nohz=off boot parameter is used, the
+If CONFIG_NO_HZ_COMMON is set, the limit is 10ms fixed.
+If CONFIG_NO_HZ_COMMON is not set or nohz=off boot parameter is used, the
limits depend on the CONFIG_HZ option:
HZ=1000: min=20000us (20ms)
HZ=250: min=80000us (80ms)
diff --git a/arch/um/include/shared/common-offsets.h b/arch/um/include/shared/common-offsets.h
index 2df313b6a586..c92306809029 100644
--- a/arch/um/include/shared/common-offsets.h
+++ b/arch/um/include/shared/common-offsets.h
@@ -30,8 +30,8 @@ DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);
#ifdef CONFIG_PRINTK
DEFINE(UML_CONFIG_PRINTK, CONFIG_PRINTK);
#endif
-#ifdef CONFIG_NO_HZ
-DEFINE(UML_CONFIG_NO_HZ, CONFIG_NO_HZ);
+#ifdef CONFIG_NO_HZ_COMMON
+DEFINE(UML_CONFIG_NO_HZ_COMMON, CONFIG_NO_HZ_COMMON);
#endif
#ifdef CONFIG_UML_X86
DEFINE(UML_CONFIG_UML_X86, CONFIG_UML_X86);
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index fac388cb464f..e9824d5dd7d5 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -79,7 +79,7 @@ long long os_nsecs(void)
return timeval_to_ns(&tv);
}
-#ifdef UML_CONFIG_NO_HZ
+#ifdef UML_CONFIG_NO_HZ_COMMON
static int after_sleep_interval(struct timespec *ts)
{
return 0;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 10626e2ee688..1ff9e0a5de27 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -230,7 +230,7 @@ extern void init_idle_bootup_task(struct task_struct *idle);
extern int runqueue_is_locked(int cpu);
-#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
+#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
extern void nohz_balance_enter_idle(int cpu);
extern void set_cpu_sd_state_idle(void);
extern int get_nohz_timer_target(void);
@@ -1758,13 +1758,13 @@ static inline int set_cpus_allowed_ptr(struct task_struct *p,
}
#endif
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
void calc_load_enter_idle(void);
void calc_load_exit_idle(void);
#else
static inline void calc_load_enter_idle(void) { }
static inline void calc_load_exit_idle(void) { }
-#endif /* CONFIG_NO_HZ */
+#endif /* CONFIG_NO_HZ_COMMON */
#ifndef CONFIG_CPUMASK_OFFSTACK
static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
@@ -1850,7 +1850,7 @@ extern void idle_task_exit(void);
static inline void idle_task_exit(void) {}
#endif
-#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
+#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
extern void wake_up_nohz_cpu(int cpu);
#else
static inline void wake_up_nohz_cpu(int cpu) { }
diff --git a/include/linux/tick.h b/include/linux/tick.h
index 44bfa8aa439f..5e403339ee14 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -82,7 +82,7 @@ extern int tick_program_event(ktime_t expires, int force);
extern void tick_setup_sched_timer(void);
# endif
-# if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS
+# if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
extern void tick_cancel_sched_timer(int cpu);
# else
static inline void tick_cancel_sched_timer(int cpu) { }
@@ -123,7 +123,7 @@ static inline void tick_check_idle(int cpu) { }
static inline int tick_oneshot_mode_active(void) { return 0; }
#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
-# ifdef CONFIG_NO_HZ
+# ifdef CONFIG_NO_HZ_COMMON
DECLARE_PER_CPU(struct tick_sched, tick_cpu_sched);
static inline int tick_nohz_tick_stopped(void)
@@ -138,7 +138,7 @@ extern ktime_t tick_nohz_get_sleep_length(void);
extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
-# else /* !CONFIG_NO_HZ */
+# else /* !CONFIG_NO_HZ_COMMON */
static inline int tick_nohz_tick_stopped(void)
{
return 0;
@@ -155,7 +155,7 @@ static inline ktime_t tick_nohz_get_sleep_length(void)
}
static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
-# endif /* !NO_HZ */
+# endif /* !CONFIG_NO_HZ_COMMON */
#ifdef CONFIG_NO_HZ_EXTENDED
extern int tick_nohz_extended_cpu(int cpu);
diff --git a/init/Kconfig b/init/Kconfig
index 8a1dac2f80a9..edc8132584f1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -580,7 +580,7 @@ config RCU_FANOUT_EXACT
config RCU_FAST_NO_HZ
bool "Accelerate last non-dyntick-idle CPU's grace periods"
- depends on NO_HZ && SMP
+ depends on NO_HZ_COMMON && SMP
default n
help
This option causes RCU to attempt to accelerate grace periods in
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index cc47812d3feb..ec60482d8b03 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -160,7 +160,7 @@ struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
*/
static int hrtimer_get_target(int this_cpu, int pinned)
{
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
if (!pinned && get_sysctl_timer_migration() && idle_cpu(this_cpu))
return get_nohz_timer_target();
#endif
@@ -1106,7 +1106,7 @@ ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
}
EXPORT_SYMBOL_GPL(hrtimer_get_remaining);
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/**
* hrtimer_get_next_event - get the time until next expiry event
*
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e91ee589f793..9bb397da63d6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -549,7 +549,7 @@ void resched_cpu(int cpu)
raw_spin_unlock_irqrestore(&rq->lock, flags);
}
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
* In the semi idle case, use the nearest busy cpu for migrating timers
* from an idle cpu. This is good for power-savings.
@@ -641,14 +641,14 @@ static inline bool got_nohz_idle_kick(void)
return idle_cpu(cpu) && test_bit(NOHZ_BALANCE_KICK, nohz_flags(cpu));
}
-#else /* CONFIG_NO_HZ */
+#else /* CONFIG_NO_HZ_COMMON */
static inline bool got_nohz_idle_kick(void)
{
return false;
}
-#endif /* CONFIG_NO_HZ */
+#endif /* CONFIG_NO_HZ_COMMON */
void sched_avg_update(struct rq *rq)
{
@@ -2139,7 +2139,7 @@ calc_load(unsigned long load, unsigned long exp, unsigned long active)
return load >> FSHIFT;
}
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
* Handle NO_HZ for the global load-average.
*
@@ -2365,12 +2365,12 @@ static void calc_global_nohz(void)
smp_wmb();
calc_load_idx++;
}
-#else /* !CONFIG_NO_HZ */
+#else /* !CONFIG_NO_HZ_COMMON */
static inline long calc_load_fold_idle(void) { return 0; }
static inline void calc_global_nohz(void) { }
-#endif /* CONFIG_NO_HZ */
+#endif /* CONFIG_NO_HZ_COMMON */
/*
* calc_load - update the avenrun load estimates 10 ticks after the
@@ -2530,7 +2530,7 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
sched_avg_update(this_rq);
}
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
* There is no sane way to deal with nohz on smp when using jiffies because the
* cpu doing the jiffies update might drift wrt the cpu doing the jiffy reading
@@ -2590,7 +2590,7 @@ void update_cpu_load_nohz(void)
}
raw_spin_unlock(&this_rq->lock);
}
-#endif /* CONFIG_NO_HZ */
+#endif /* CONFIG_NO_HZ_COMMON */
/*
* Called from scheduler_tick()
@@ -7023,7 +7023,7 @@ void __init sched_init(void)
INIT_LIST_HEAD(&rq->cfs_tasks);
rq_attach_root(rq, &def_root_domain);
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
rq->nohz_flags = 0;
#endif
#endif
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 539760ef00c4..5c97fca091a7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5331,7 +5331,7 @@ out_unlock:
return 0;
}
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
* idle load balancing details
* - When one of the busy CPUs notice that there may be an idle rebalancing
@@ -5541,9 +5541,9 @@ out:
rq->next_balance = next_balance;
}
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
- * In CONFIG_NO_HZ case, the idle balance kickee will do the
+ * In CONFIG_NO_HZ_COMMON case, the idle balance kickee will do the
* rebalancing for all the cpus for whom scheduler ticks are stopped.
*/
static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle)
@@ -5686,7 +5686,7 @@ void trigger_load_balance(struct rq *rq, int cpu)
if (time_after_eq(jiffies, rq->next_balance) &&
likely(!on_null_domain(cpu)))
raise_softirq(SCHED_SOFTIRQ);
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu)))
nohz_balancer_kick(cpu);
#endif
@@ -6156,7 +6156,7 @@ __init void init_sched_fair_class(void)
#ifdef CONFIG_SMP
open_softirq(SCHED_SOFTIRQ, run_rebalance_domains);
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
nohz.next_balance = jiffies;
zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
cpu_notifier(sched_ilb_notifier, 0);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 3bd15a43eebc..889904dd6d77 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -404,7 +404,7 @@ struct rq {
#define CPU_LOAD_IDX_MAX 5
unsigned long cpu_load[CPU_LOAD_IDX_MAX];
unsigned long last_load_update_tick;
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
u64 nohz_stamp;
unsigned long nohz_flags;
#endif
@@ -1333,7 +1333,7 @@ extern void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq);
extern void account_cfs_bandwidth_used(int enabled, int was_enabled);
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
enum rq_nohz_flag_bits {
NOHZ_TICK_STOPPED,
NOHZ_BALANCE_KICK,
diff --git a/kernel/softirq.c b/kernel/softirq.c
index b4d252fd195b..de15813f2a66 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -348,7 +348,7 @@ void irq_exit(void)
if (!in_interrupt() && local_softirq_pending())
invoke_softirq();
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/* Make sure that timer wheel updates are propagated */
if (idle_cpu(smp_processor_id()) && !in_interrupt() && !need_resched())
tick_nohz_irq_exit();
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 726c33e00da2..c88fc43494c9 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -64,16 +64,21 @@ config GENERIC_CMOS_UPDATE
if GENERIC_CLOCKEVENTS
menu "Timers subsystem"
-# Core internal switch. Selected by NO_HZ / HIGH_RES_TIMERS. This is
+# Core internal switch. Selected by NO_HZ_COMMON / HIGH_RES_TIMERS. This is
# only related to the tick functionality. Oneshot clockevent devices
# are supported independ of this.
config TICK_ONESHOT
bool
+config NO_HZ_COMMON
+ bool
+ depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
+ select TICK_ONESHOT
+
config NO_HZ
bool "Tickless System (Dynamic Ticks)"
depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
- select TICK_ONESHOT
+ select NO_HZ_COMMON
help
This option enables a tickless system: timer interrupts will
only trigger on an as-needed basis both when the system is
@@ -81,14 +86,14 @@ config NO_HZ
config NO_HZ_EXTENDED
bool "Full dynticks system"
- # NO_HZ dependency
+ # NO_HZ_COMMON dependency
depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
# RCU_USER_QS
depends on HAVE_CONTEXT_TRACKING && SMP
# RCU_NOCB_CPU dependency
depends on TREE_RCU || TREE_PREEMPT_RCU
depends on VIRT_CPU_ACCOUNTING_GEN
- select NO_HZ
+ select NO_HZ_COMMON
select RCU_USER_QS
select RCU_NOCB_CPU
select CONTEXT_TRACKING_FORCE
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 57bb3fe5aaa3..ccfc2086cd4b 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -104,7 +104,7 @@ static void tick_sched_do_timer(ktime_t now)
{
int cpu = smp_processor_id();
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
* Check if the do_timer duty was dropped. We don't care about
* concurrency: This happens only when the cpu in charge went
@@ -124,7 +124,7 @@ static void tick_sched_do_timer(ktime_t now)
static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
{
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
* When we are idle and the tick is stopped, we have to touch
* the watchdog as we might not schedule for a really long
@@ -235,7 +235,7 @@ core_initcall(init_tick_nohz_extended);
/*
* NOHZ - aka dynamic tick functionality
*/
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
* NO HZ enabled ?
*/
@@ -907,7 +907,7 @@ static inline void tick_check_nohz(int cpu)
static inline void tick_nohz_switch_to_nohz(void) { }
static inline void tick_check_nohz(int cpu) { }
-#endif /* NO_HZ */
+#endif /* CONFIG_NO_HZ_COMMON */
/*
* Called from irq_enter to notify about the possible interruption of idle()
@@ -992,14 +992,14 @@ void tick_setup_sched_timer(void)
now = ktime_get();
}
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
if (tick_nohz_enabled)
ts->nohz_mode = NOHZ_MODE_HIGHRES;
#endif
}
#endif /* HIGH_RES_TIMERS */
-#if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS
+#if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
void tick_cancel_sched_timer(int cpu)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
diff --git a/kernel/timer.c b/kernel/timer.c
index 4e3040b40d16..1b7489fdea41 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -738,7 +738,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
cpu = smp_processor_id();
-#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
+#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu))
cpu = get_nohz_timer_target();
#endif
@@ -1188,7 +1188,7 @@ static inline void __run_timers(struct tvec_base *base)
spin_unlock_irq(&base->lock);
}
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
/*
* Find out when the next timer event is due to happen. This
* is used on S/390 to stop all activity when a CPU is idle.