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Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: hrtick_enabled() should use cpu_active()
  sched, x86: clean up hrtick implementation
  sched: fix build error, provide partition_sched_domains() unconditionally
  sched: fix warning in inc_rt_tasks() to not declare variable 'rq' if it's not needed
  cpu hotplug: Make cpu_active_map synchronization dependency clear
  cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)
  sched: rework of "prioritize non-migratable tasks over migratable ones"
  sched: reduce stack size in isolated_cpu_setup()
  Revert parts of "ftrace: do not trace scheduler functions"

Fixed up conflicts in include/asm-x86/thread_info.h (due to the
TIF_SINGLESTEP unification vs TIF_HRTICK_RESCHED removal) and
kernel/sched_fair.c (due to cpu_active_map vs for_each_cpu_mask_nr()
introduction).
This commit is contained in:
Linus Torvalds 2008-07-23 19:36:53 -07:00
parent 26dcce0fab ba42059fbd
commit 7f9dce3837
14 changed files with 231 additions and 258 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/kernel/signal_32.c
View File

@ -661,8 +661,5 @@ do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs);
if (thread_info_flags & _TIF_HRTICK_RESCHED)
hrtick_resched();
clear_thread_flag(TIF_IRET);
}

3
arch/x86/kernel/signal_64.c
View File

@ -496,9 +496,6 @@ void do_notify_resume(struct pt_regs *regs, void *unused,
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs);
if (thread_info_flags & _TIF_HRTICK_RESCHED)
hrtick_resched();
}
void signal_fault(struct pt_regs *regs, void __user *frame, char *where)

4
include/asm-x86/thread_info.h
View File

@ -79,7 +79,6 @@ struct thread_info {
#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
#define TIF_SECCOMP 8 /* secure computing */
#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
#define TIF_HRTICK_RESCHED 11 /* reprogram hrtick timer */
#define TIF_NOTSC 16 /* TSC is not accessible in userland */
#define TIF_IA32 17 /* 32bit process */
#define TIF_FORK 18 /* ret_from_fork */
@ -102,7 +101,6 @@ struct thread_info {
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
#define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
#define _TIF_HRTICK_RESCHED (1 << TIF_HRTICK_RESCHED)
#define _TIF_NOTSC (1 << TIF_NOTSC)
#define _TIF_IA32 (1 << TIF_IA32)
#define _TIF_FORK (1 << TIF_FORK)
@ -135,7 +133,7 @@ struct thread_info {
/* Only used for 64 bit */
#define _TIF_DO_NOTIFY_MASK \
(_TIF_SIGPENDING|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)
(_TIF_SIGPENDING|_TIF_MCE_NOTIFY)
/* flags to check in __switch_to() */
#define _TIF_WORK_CTXSW \

6
include/linux/cpumask.h
View File

@ -458,13 +458,14 @@ int __next_cpu_nr(int n, const cpumask_t *srcp);
/*
* The following particular system cpumasks and operations manage
* possible, present and online cpus. Each of them is a fixed size
* possible, present, active and online cpus. Each of them is a fixed size
* bitmap of size NR_CPUS.
*
* #ifdef CONFIG_HOTPLUG_CPU
* cpu_possible_map - has bit 'cpu' set iff cpu is populatable
* cpu_present_map - has bit 'cpu' set iff cpu is populated
* cpu_online_map - has bit 'cpu' set iff cpu available to scheduler
* cpu_active_map - has bit 'cpu' set iff cpu available to migration
* #else
* cpu_possible_map - has bit 'cpu' set iff cpu is populated
* cpu_present_map - copy of cpu_possible_map
@ -515,6 +516,7 @@ int __next_cpu_nr(int n, const cpumask_t *srcp);
extern cpumask_t cpu_possible_map;
extern cpumask_t cpu_online_map;
extern cpumask_t cpu_present_map;
extern cpumask_t cpu_active_map;
#if NR_CPUS > 1
#define num_online_cpus() cpus_weight_nr(cpu_online_map)
@ -523,6 +525,7 @@ extern cpumask_t cpu_present_map;
#define cpu_online(cpu) cpu_isset((cpu), cpu_online_map)
#define cpu_possible(cpu) cpu_isset((cpu), cpu_possible_map)
#define cpu_present(cpu) cpu_isset((cpu), cpu_present_map)
#define cpu_active(cpu) cpu_isset((cpu), cpu_active_map)
#else
#define num_online_cpus() 1
#define num_possible_cpus() 1
@ -530,6 +533,7 @@ extern cpumask_t cpu_present_map;
#define cpu_online(cpu) ((cpu) == 0)
#define cpu_possible(cpu) ((cpu) == 0)
#define cpu_present(cpu) ((cpu) == 0)
#define cpu_active(cpu) ((cpu) == 0)
#endif
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))

7
include/linux/cpuset.h
View File

@ -78,6 +78,8 @@ extern void cpuset_track_online_nodes(void);
extern int current_cpuset_is_being_rebound(void);
extern void rebuild_sched_domains(void);
#else /* !CONFIG_CPUSETS */
static inline int cpuset_init_early(void) { return 0; }
@ -156,6 +158,11 @@ static inline int current_cpuset_is_being_rebound(void)
return 0;
}
static inline void rebuild_sched_domains(void)
{
partition_sched_domains(0, NULL, NULL);
}
#endif /* !CONFIG_CPUSETS */
#endif /* _LINUX_CPUSET_H */

11
include/linux/sched.h
View File

@ -825,7 +825,16 @@ extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
struct sched_domain_attr *dattr_new);
extern int arch_reinit_sched_domains(void);
#endif /* CONFIG_SMP */
#else /* CONFIG_SMP */
struct sched_domain_attr;
static inline void
partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
struct sched_domain_attr *dattr_new)
{
}
#endif /* !CONFIG_SMP */
struct io_context; /* See blkdev.h */
#define NGROUPS_SMALL 32

7
init/main.c
View File

@ -415,6 +415,13 @@ static void __init smp_init(void)
{
unsigned int cpu;
/*
* Set up the current CPU as possible to migrate to.
* The other ones will be done by cpu_up/cpu_down()
*/
cpu = smp_processor_id();
cpu_set(cpu, cpu_active_map);
/* FIXME: This should be done in userspace --RR */
for_each_present_cpu(cpu) {
if (num_online_cpus() >= setup_max_cpus)

2
kernel/Kconfig.hz
View File

@ -55,4 +55,4 @@ config HZ
default 1000 if HZ_1000
config SCHED_HRTICK
def_bool HIGH_RES_TIMERS && X86
def_bool HIGH_RES_TIMERS

2
kernel/Makefile
View File

@ -11,6 +11,8 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
notifier.o ksysfs.o pm_qos_params.o sched_clock.o
CFLAGS_REMOVE_sched.o = -mno-spe
ifdef CONFIG_FTRACE
# Do not trace debug files and internal ftrace files
CFLAGS_REMOVE_lockdep.o = -pg

36
kernel/cpu.c
View File

@ -64,6 +64,8 @@ void __init cpu_hotplug_init(void)
cpu_hotplug.refcount = 0;
}
cpumask_t cpu_active_map;
#ifdef CONFIG_HOTPLUG_CPU
void get_online_cpus(void)
@ -291,11 +293,30 @@ int __ref cpu_down(unsigned int cpu)
int err = 0;
cpu_maps_update_begin();
if (cpu_hotplug_disabled)
if (cpu_hotplug_disabled) {
err = -EBUSY;
else
goto out;
}
cpu_clear(cpu, cpu_active_map);
/*
* Make sure the all cpus did the reschedule and are not
* using stale version of the cpu_active_map.
* This is not strictly necessary becuase stop_machine()
* that we run down the line already provides the required
* synchronization. But it's really a side effect and we do not
* want to depend on the innards of the stop_machine here.
*/
synchronize_sched();
err = _cpu_down(cpu, 0);
if (cpu_online(cpu))
cpu_set(cpu, cpu_active_map);
out:
cpu_maps_update_done();
return err;
}
@ -355,11 +376,18 @@ int __cpuinit cpu_up(unsigned int cpu)
}
cpu_maps_update_begin();
if (cpu_hotplug_disabled)
if (cpu_hotplug_disabled) {
err = -EBUSY;
else
goto out;
}
err = _cpu_up(cpu, 0);
if (cpu_online(cpu))
cpu_set(cpu, cpu_active_map);
out:
cpu_maps_update_done();
return err;
}

2
kernel/cpuset.c
View File

@ -564,7 +564,7 @@ update_domain_attr(struct sched_domain_attr *dattr, struct cpuset *c)
* partition_sched_domains().
*/
static void rebuild_sched_domains(void)
void rebuild_sched_domains(void)
{
struct kfifo *q; /* queue of cpusets to be scanned */
struct cpuset *cp; /* scans q */

313
kernel/sched.c
View File

@ -571,8 +571,10 @@ struct rq {
#endif
#ifdef CONFIG_SCHED_HRTICK
unsigned long hrtick_flags;
ktime_t hrtick_expire;
#ifdef CONFIG_SMP
int hrtick_csd_pending;
struct call_single_data hrtick_csd;
#endif
struct hrtimer hrtick_timer;
#endif
@ -983,13 +985,6 @@ static struct rq *this_rq_lock(void)
return rq;
}
static void __resched_task(struct task_struct *p, int tif_bit);
static inline void resched_task(struct task_struct *p)
{
__resched_task(p, TIF_NEED_RESCHED);
}
#ifdef CONFIG_SCHED_HRTICK
/*
* Use HR-timers to deliver accurate preemption points.
@ -1001,25 +996,6 @@ static inline void resched_task(struct task_struct *p)
* When we get rescheduled we reprogram the hrtick_timer outside of the
* rq->lock.
*/
static inline void resched_hrt(struct task_struct *p)
{
__resched_task(p, TIF_HRTICK_RESCHED);
}
static inline void resched_rq(struct rq *rq)
{
unsigned long flags;
spin_lock_irqsave(&rq->lock, flags);
resched_task(rq->curr);
spin_unlock_irqrestore(&rq->lock, flags);
}
enum {
HRTICK_SET, /* re-programm hrtick_timer */
HRTICK_RESET, /* not a new slice */
HRTICK_BLOCK, /* stop hrtick operations */
};
/*
* Use hrtick when:
@ -1030,72 +1006,17 @@ static inline int hrtick_enabled(struct rq *rq)
{
if (!sched_feat(HRTICK))
return 0;
if (unlikely(test_bit(HRTICK_BLOCK, &rq->hrtick_flags)))
if (!cpu_active(cpu_of(rq)))
return 0;
return hrtimer_is_hres_active(&rq->hrtick_timer);
}
/*
* Called to set the hrtick timer state.
*
* called with rq->lock held and irqs disabled
*/
static void hrtick_start(struct rq *rq, u64 delay, int reset)
{
assert_spin_locked(&rq->lock);
/*
* preempt at: now + delay
*/
rq->hrtick_expire =
ktime_add_ns(rq->hrtick_timer.base->get_time(), delay);
/*
* indicate we need to program the timer
*/
__set_bit(HRTICK_SET, &rq->hrtick_flags);
if (reset)
__set_bit(HRTICK_RESET, &rq->hrtick_flags);
/*
* New slices are called from the schedule path and don't need a
* forced reschedule.
*/
if (reset)
resched_hrt(rq->curr);
}
static void hrtick_clear(struct rq *rq)
{
if (hrtimer_active(&rq->hrtick_timer))
hrtimer_cancel(&rq->hrtick_timer);
}
/*
* Update the timer from the possible pending state.
*/
static void hrtick_set(struct rq *rq)
{
ktime_t time;
int set, reset;
unsigned long flags;
WARN_ON_ONCE(cpu_of(rq) != smp_processor_id());
spin_lock_irqsave(&rq->lock, flags);
set = __test_and_clear_bit(HRTICK_SET, &rq->hrtick_flags);
reset = __test_and_clear_bit(HRTICK_RESET, &rq->hrtick_flags);
time = rq->hrtick_expire;
clear_thread_flag(TIF_HRTICK_RESCHED);
spin_unlock_irqrestore(&rq->lock, flags);
if (set) {
hrtimer_start(&rq->hrtick_timer, time, HRTIMER_MODE_ABS);
if (reset && !hrtimer_active(&rq->hrtick_timer))
resched_rq(rq);
} else
hrtick_clear(rq);
}
/*
* High-resolution timer tick.
* Runs from hardirq context with interrupts disabled.
@ -1115,27 +1036,37 @@ static enum hrtimer_restart hrtick(struct hrtimer *timer)
}
#ifdef CONFIG_SMP
static void hotplug_hrtick_disable(int cpu)
/*
* called from hardirq (IPI) context
*/
static void __hrtick_start(void *arg)
{
struct rq *rq = cpu_rq(cpu);
unsigned long flags;
struct rq *rq = arg;
spin_lock_irqsave(&rq->lock, flags);
rq->hrtick_flags = 0;
__set_bit(HRTICK_BLOCK, &rq->hrtick_flags);
spin_unlock_irqrestore(&rq->lock, flags);
hrtick_clear(rq);
spin_lock(&rq->lock);
hrtimer_restart(&rq->hrtick_timer);
rq->hrtick_csd_pending = 0;
spin_unlock(&rq->lock);
}
static void hotplug_hrtick_enable(int cpu)
/*
* Called to set the hrtick timer state.
*
* called with rq->lock held and irqs disabled
*/
static void hrtick_start(struct rq *rq, u64 delay)
{
struct rq *rq = cpu_rq(cpu);
unsigned long flags;
struct hrtimer *timer = &rq->hrtick_timer;
ktime_t time = ktime_add_ns(timer->base->get_time(), delay);
spin_lock_irqsave(&rq->lock, flags);
__clear_bit(HRTICK_BLOCK, &rq->hrtick_flags);
spin_unlock_irqrestore(&rq->lock, flags);
timer->expires = time;
if (rq == this_rq()) {
hrtimer_restart(timer);
} else if (!rq->hrtick_csd_pending) {
__smp_call_function_single(cpu_of(rq), &rq->hrtick_csd);
rq->hrtick_csd_pending = 1;
}
}
static int
@ -1150,16 +1081,7 @@ hotplug_hrtick(struct notifier_block *nfb, unsigned long action, void *hcpu)
case CPU_DOWN_PREPARE_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
hotplug_hrtick_disable(cpu);
return NOTIFY_OK;
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
hotplug_hrtick_enable(cpu);
hrtick_clear(cpu_rq(cpu));
return NOTIFY_OK;
}
@ -1170,46 +1092,45 @@ static void init_hrtick(void)
{
hotcpu_notifier(hotplug_hrtick, 0);
}
#else
/*
* Called to set the hrtick timer state.
*
* called with rq->lock held and irqs disabled
*/
static void hrtick_start(struct rq *rq, u64 delay)
{
hrtimer_start(&rq->hrtick_timer, ns_to_ktime(delay), HRTIMER_MODE_REL);
}
static void init_hrtick(void)
{
}
#endif /* CONFIG_SMP */
static void init_rq_hrtick(struct rq *rq)
{
rq->hrtick_flags = 0;
#ifdef CONFIG_SMP
rq->hrtick_csd_pending = 0;
rq->hrtick_csd.flags = 0;
rq->hrtick_csd.func = __hrtick_start;
rq->hrtick_csd.info = rq;
#endif
hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
rq->hrtick_timer.function = hrtick;
rq->hrtick_timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_SOFTIRQ;
}
void hrtick_resched(void)
{
struct rq *rq;
unsigned long flags;
if (!test_thread_flag(TIF_HRTICK_RESCHED))
return;
local_irq_save(flags);
rq = cpu_rq(smp_processor_id());
hrtick_set(rq);
local_irq_restore(flags);
}
#else
static inline void hrtick_clear(struct rq *rq)
{
}
static inline void hrtick_set(struct rq *rq)
{
}
static inline void init_rq_hrtick(struct rq *rq)
{
}
void hrtick_resched(void)
{
}
static inline void init_hrtick(void)
{
}
@ -1228,16 +1149,16 @@ static inline void init_hrtick(void)
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif
static void __resched_task(struct task_struct *p, int tif_bit)
static void resched_task(struct task_struct *p)
{
int cpu;
assert_spin_locked(&task_rq(p)->lock);
if (unlikely(test_tsk_thread_flag(p, tif_bit)))
if (unlikely(test_tsk_thread_flag(p, TIF_NEED_RESCHED)))
return;
set_tsk_thread_flag(p, tif_bit);
set_tsk_thread_flag(p, TIF_NEED_RESCHED);
cpu = task_cpu(p);
if (cpu == smp_processor_id())
@ -1303,10 +1224,10 @@ void wake_up_idle_cpu(int cpu)
#endif /* CONFIG_NO_HZ */
#else /* !CONFIG_SMP */
static void __resched_task(struct task_struct *p, int tif_bit)
static void resched_task(struct task_struct *p)
{
assert_spin_locked(&task_rq(p)->lock);
set_tsk_thread_flag(p, tif_bit);
set_tsk_need_resched(p);
}
#endif /* CONFIG_SMP */
@ -2881,7 +2802,7 @@ static void sched_migrate_task(struct task_struct *p, int dest_cpu)
rq = task_rq_lock(p, &flags);
if (!cpu_isset(dest_cpu, p->cpus_allowed)
|| unlikely(cpu_is_offline(dest_cpu)))
|| unlikely(!cpu_active(dest_cpu)))
goto out;
/* force the process onto the specified CPU */
@ -3849,7 +3770,7 @@ int select_nohz_load_balancer(int stop_tick)
/*
* If we are going offline and still the leader, give up!
*/
if (cpu_is_offline(cpu) &&
if (!cpu_active(cpu) &&
atomic_read(&nohz.load_balancer) == cpu) {
if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
BUG();
@ -4395,7 +4316,7 @@ asmlinkage void __sched schedule(void)
struct task_struct *prev, *next;
unsigned long *switch_count;
struct rq *rq;
int cpu, hrtick = sched_feat(HRTICK);
int cpu;
need_resched:
preempt_disable();
@ -4410,7 +4331,7 @@ need_resched_nonpreemptible:
schedule_debug(prev);
if (hrtick)
if (sched_feat(HRTICK))
hrtick_clear(rq);
/*
@ -4457,9 +4378,6 @@ need_resched_nonpreemptible:
} else
spin_unlock_irq(&rq->lock);
if (hrtick)
hrtick_set(rq);
if (unlikely(reacquire_kernel_lock(current) < 0))
goto need_resched_nonpreemptible;
@ -5876,7 +5794,7 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu)
struct rq *rq_dest, *rq_src;
int ret = 0, on_rq;
if (unlikely(cpu_is_offline(dest_cpu)))
if (unlikely(!cpu_active(dest_cpu)))
return ret;
rq_src = cpu_rq(src_cpu);
@ -6768,7 +6686,8 @@ static cpumask_t cpu_isolated_map = CPU_MASK_NONE;
/* Setup the mask of cpus configured for isolated domains */
static int __init isolated_cpu_setup(char *str)
{
int ints[NR_CPUS], i;
static int __initdata ints[NR_CPUS];
int i;
str = get_options(str, ARRAY_SIZE(ints), ints);
cpus_clear(cpu_isolated_map);
@ -7552,18 +7471,6 @@ void __attribute__((weak)) arch_update_cpu_topology(void)
{
}
/*
* Free current domain masks.
* Called after all cpus are attached to NULL domain.
*/
static void free_sched_domains(void)
{
ndoms_cur = 0;
if (doms_cur != &fallback_doms)
kfree(doms_cur);
doms_cur = &fallback_doms;
}
/*
* Set up scheduler domains and groups. Callers must hold the hotplug lock.
* For now this just excludes isolated cpus, but could be used to
@ -7642,7 +7549,7 @@ static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
* ownership of it and will kfree it when done with it. If the caller
* failed the kmalloc call, then it can pass in doms_new == NULL,
* and partition_sched_domains() will fallback to the single partition
* 'fallback_doms'.
* 'fallback_doms', it also forces the domains to be rebuilt.
*
* Call with hotplug lock held
*/
@ -7656,12 +7563,8 @@ void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
/* always unregister in case we don't destroy any domains */
unregister_sched_domain_sysctl();
if (doms_new == NULL) {
ndoms_new = 1;
doms_new = &fallback_doms;
cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map);
dattr_new = NULL;
}
if (doms_new == NULL)
ndoms_new = 0;
/* Destroy deleted domains */
for (i = 0; i < ndoms_cur; i++) {
@ -7676,6 +7579,14 @@ match1:
;
}
if (doms_new == NULL) {
ndoms_cur = 0;
ndoms_new = 1;
doms_new = &fallback_doms;
cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map);
dattr_new = NULL;
}
/* Build new domains */
for (i = 0; i < ndoms_new; i++) {
for (j = 0; j < ndoms_cur; j++) {
@ -7706,17 +7617,10 @@ match2:
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
int arch_reinit_sched_domains(void)
{
int err;
get_online_cpus();
mutex_lock(&sched_domains_mutex);
detach_destroy_domains(&cpu_online_map);
free_sched_domains();
err = arch_init_sched_domains(&cpu_online_map);
mutex_unlock(&sched_domains_mutex);
rebuild_sched_domains();
put_online_cpus();
return err;
return 0;
}
static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
@ -7786,14 +7690,30 @@ int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)
}
#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
#ifndef CONFIG_CPUSETS
/*
* Force a reinitialization of the sched domains hierarchy. The domains
* and groups cannot be updated in place without racing with the balancing
* code, so we temporarily attach all running cpus to the NULL domain
* which will prevent rebalancing while the sched domains are recalculated.
* Add online and remove offline CPUs from the scheduler domains.
* When cpusets are enabled they take over this function.
*/
static int update_sched_domains(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
partition_sched_domains(0, NULL, NULL);
return NOTIFY_OK;
default:
return NOTIFY_DONE;
}
}
#endif
static int update_runtime(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
int cpu = (int)(long)hcpu;
@ -7801,44 +7721,18 @@ static int update_sched_domains(struct notifier_block *nfb,
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
disable_runtime(cpu_rq(cpu));
/* fall-through */
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
detach_destroy_domains(&cpu_online_map);
free_sched_domains();
return NOTIFY_OK;
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
enable_runtime(cpu_rq(cpu));
/* fall-through */
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
/*
* Fall through and re-initialise the domains.
*/
break;
return NOTIFY_OK;
default:
return NOTIFY_DONE;
}
#ifndef CONFIG_CPUSETS
/*
* Create default domain partitioning if cpusets are disabled.
* Otherwise we let cpusets rebuild the domains based on the
* current setup.
*/
/* The hotplug lock is already held by cpu_up/cpu_down */
arch_init_sched_domains(&cpu_online_map);
#endif
return NOTIFY_OK;
}
void __init sched_init_smp(void)
@ -7858,8 +7752,15 @@ void __init sched_init_smp(void)
cpu_set(smp_processor_id(), non_isolated_cpus);
mutex_unlock(&sched_domains_mutex);
put_online_cpus();
#ifndef CONFIG_CPUSETS
/* XXX: Theoretical race here - CPU may be hotplugged now */
hotcpu_notifier(update_sched_domains, 0);
#endif
/* RT runtime code needs to handle some hotplug events */
hotcpu_notifier(update_runtime, 0);
init_hrtick();
/* Move init over to a non-isolated CPU */

8
kernel/sched_fair.c
View File

@ -878,7 +878,6 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued)
#ifdef CONFIG_SCHED_HRTICK
static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
{
int requeue = rq->curr == p;
struct sched_entity *se = &p->se;
struct cfs_rq *cfs_rq = cfs_rq_of(se);
@ -899,10 +898,10 @@ static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
* Don't schedule slices shorter than 10000ns, that just
* doesn't make sense. Rely on vruntime for fairness.
*/
if (!requeue)
if (rq->curr != p)
delta = max(10000LL, delta);
hrtick_start(rq, delta, requeue);
hrtick_start(rq, delta);
}
}
#else /* !CONFIG_SCHED_HRTICK */
@ -1004,6 +1003,8 @@ static void yield_task_fair(struct rq *rq)
* not idle and an idle cpu is available. The span of cpus to
* search starts with cpus closest then further out as needed,
* so we always favor a closer, idle cpu.
* Domains may include CPUs that are not usable for migration,
* hence we need to mask them out (cpu_active_map)
*
* Returns the CPU we should wake onto.
*/
@ -1031,6 +1032,7 @@ static int wake_idle(int cpu, struct task_struct *p)
|| ((sd->flags & SD_WAKE_IDLE_FAR)
&& !task_hot(p, task_rq(p)->clock, sd))) {
cpus_and(tmp, sd->span, p->cpus_allowed);
cpus_and(tmp, tmp, cpu_active_map);
for_each_cpu_mask_nr(i, tmp) {
if (idle_cpu(i)) {
if (i != task_cpu(p)) {

75
kernel/sched_rt.c
View File

@ -505,7 +505,9 @@ void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
rt_rq->rt_nr_running++;
#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
if (rt_se_prio(rt_se) < rt_rq->highest_prio) {
#ifdef CONFIG_SMP
struct rq *rq = rq_of_rt_rq(rt_rq);
#endif
rt_rq->highest_prio = rt_se_prio(rt_se);
#ifdef CONFIG_SMP
@ -599,11 +601,7 @@ static void __enqueue_rt_entity(struct sched_rt_entity *rt_se)
if (group_rq && (rt_rq_throttled(group_rq) || !group_rq->rt_nr_running))
return;
if (rt_se->nr_cpus_allowed == 1)
list_add(&rt_se->run_list, queue);
else
list_add_tail(&rt_se->run_list, queue);
__set_bit(rt_se_prio(rt_se), array->bitmap);
inc_rt_tasks(rt_se, rt_rq);
@ -688,32 +686,34 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
* Put task to the end of the run list without the overhead of dequeue
* followed by enqueue.
*/
static
void requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se)
static void
requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se, int head)
{
struct rt_prio_array *array = &rt_rq->active;
if (on_rt_rq(rt_se)) {
list_del_init(&rt_se->run_list);
list_add_tail(&rt_se->run_list,
array->queue + rt_se_prio(rt_se));
struct rt_prio_array *array = &rt_rq->active;
struct list_head *queue = array->queue + rt_se_prio(rt_se);
if (head)
list_move(&rt_se->run_list, queue);
else
list_move_tail(&rt_se->run_list, queue);
}
}
static void requeue_task_rt(struct rq *rq, struct task_struct *p)
static void requeue_task_rt(struct rq *rq, struct task_struct *p, int head)
{
struct sched_rt_entity *rt_se = &p->rt;
struct rt_rq *rt_rq;
for_each_sched_rt_entity(rt_se) {
rt_rq = rt_rq_of_se(rt_se);
requeue_rt_entity(rt_rq, rt_se);
requeue_rt_entity(rt_rq, rt_se, head);
}
}
static void yield_task_rt(struct rq *rq)
{
requeue_task_rt(rq, rq->curr);
requeue_task_rt(rq, rq->curr, 0);
}
#ifdef CONFIG_SMP
@ -753,6 +753,30 @@ static int select_task_rq_rt(struct task_struct *p, int sync)
*/
return task_cpu(p);
}
static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
{
cpumask_t mask;
if (rq->curr->rt.nr_cpus_allowed == 1)
return;
if (p->rt.nr_cpus_allowed != 1
&& cpupri_find(&rq->rd->cpupri, p, &mask))
return;
if (!cpupri_find(&rq->rd->cpupri, rq->curr, &mask))
return;
/*
* There appears to be other cpus that can accept
* current and none to run 'p', so lets reschedule
* to try and push current away:
*/
requeue_task_rt(rq, p, 1);
resched_task(rq->curr);
}
#endif /* CONFIG_SMP */
/*
@ -778,18 +802,8 @@ static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p)
* to move current somewhere else, making room for our non-migratable
* task.
*/
if((p->prio == rq->curr->prio)
&& p->rt.nr_cpus_allowed == 1
&& rq->curr->rt.nr_cpus_allowed != 1) {
cpumask_t mask;
if (cpupri_find(&rq->rd->cpupri, rq->curr, &mask))
/*
* There appears to be other cpus that can accept
* current, so lets reschedule to try and push it away
*/
resched_task(rq->curr);
}
if (p->prio == rq->curr->prio && !need_resched())
check_preempt_equal_prio(rq, p);
#endif
}
@ -921,6 +935,13 @@ static int find_lowest_rq(struct task_struct *task)
if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask))
return -1; /* No targets found */
/*
* Only consider CPUs that are usable for migration.
* I guess we might want to change cpupri_find() to ignore those
* in the first place.
*/
cpus_and(*lowest_mask, *lowest_mask, cpu_active_map);
/*
* At this point we have built a mask of cpus representing the
* lowest priority tasks in the system. Now we want to elect
@ -1415,7 +1436,7 @@ static void task_tick_rt(struct rq *rq, struct task_struct *p, int queued)
* on the queue:
*/
if (p->rt.run_list.prev != p->rt.run_list.next) {
requeue_task_rt(rq, p);
requeue_task_rt(rq, p, 0);
set_tsk_need_resched(p);
}
}