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sched: make posix-cpu-timers use CFS's accounting information

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update the posix-cpu-timers code to use CFS's CPU accounting information.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-07-09 18:51:58 +02:00
parent 20d315d42a
commit 41b86e9c51
3 changed files with 33 additions and 42 deletions
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5
include/linux/sched.h
View file

@ -482,7 +482,8 @@ struct signal_struct {
* from jiffies_to_ns(utime + stime) if sched_clock uses something
* other than jiffies.)
*/
unsigned long long sched_time;
unsigned long sched_time;
unsigned long long sum_sched_runtime;
/*
* We don't bother to synchronize most readers of this at all,
@ -1308,7 +1309,7 @@ static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
extern unsigned long long sched_clock(void);
extern unsigned long long
current_sched_time(const struct task_struct *current_task);
task_sched_runtime(struct task_struct *task);
/* sched_exec is called by processes performing an exec */
#ifdef CONFIG_SMP

34
kernel/posix-cpu-timers.c
View file

@ -161,7 +161,7 @@ static inline cputime_t virt_ticks(struct task_struct *p)
}
static inline unsigned long long sched_ns(struct task_struct *p)
{
return (p == current) ? current_sched_time(p) : p->sched_time;
return task_sched_runtime(p);
}
int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp)
@ -246,10 +246,10 @@ static int cpu_clock_sample_group_locked(unsigned int clock_idx,
} while (t != p);
break;
case CPUCLOCK_SCHED:
cpu->sched = p->signal->sched_time;
cpu->sched = p->signal->sum_sched_runtime;
/* Add in each other live thread. */
while ((t = next_thread(t)) != p) {
cpu->sched += t->sched_time;
cpu->sched += t->se.sum_exec_runtime;
}
cpu->sched += sched_ns(p);
break;
@ -422,7 +422,7 @@ int posix_cpu_timer_del(struct k_itimer *timer)
*/
static void cleanup_timers(struct list_head *head,
cputime_t utime, cputime_t stime,
unsigned long long sched_time)
unsigned long long sum_exec_runtime)
{
struct cpu_timer_list *timer, *next;
cputime_t ptime = cputime_add(utime, stime);
@ -451,10 +451,10 @@ static void cleanup_timers(struct list_head *head,
++head;
list_for_each_entry_safe(timer, next, head, entry) {
list_del_init(&timer->entry);
if (timer->expires.sched < sched_time) {
if (timer->expires.sched < sum_exec_runtime) {
timer->expires.sched = 0;
} else {
timer->expires.sched -= sched_time;
timer->expires.sched -= sum_exec_runtime;
}
}
}
@ -467,7 +467,7 @@ static void cleanup_timers(struct list_head *head,
void posix_cpu_timers_exit(struct task_struct *tsk)
{
cleanup_timers(tsk->cpu_timers,
tsk->utime, tsk->stime, tsk->sched_time);
tsk->utime, tsk->stime, tsk->se.sum_exec_runtime);
}
void posix_cpu_timers_exit_group(struct task_struct *tsk)
@ -475,7 +475,7 @@ void posix_cpu_timers_exit_group(struct task_struct *tsk)
cleanup_timers(tsk->signal->cpu_timers,
cputime_add(tsk->utime, tsk->signal->utime),
cputime_add(tsk->stime, tsk->signal->stime),
tsk->sched_time + tsk->signal->sched_time);
tsk->se.sum_exec_runtime + tsk->signal->sum_sched_runtime);
}
@ -536,7 +536,7 @@ static void process_timer_rebalance(struct task_struct *p,
nsleft = max_t(unsigned long long, nsleft, 1);
do {
if (likely(!(t->flags & PF_EXITING))) {
ns = t->sched_time + nsleft;
ns = t->se.sum_exec_runtime + nsleft;
if (t->it_sched_expires == 0 ||
t->it_sched_expires > ns) {
t->it_sched_expires = ns;
@ -1004,7 +1004,7 @@ static void check_thread_timers(struct task_struct *tsk,
struct cpu_timer_list *t = list_first_entry(timers,
struct cpu_timer_list,
entry);
if (!--maxfire || tsk->sched_time < t->expires.sched) {
if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) {
tsk->it_sched_expires = t->expires.sched;
break;
}
@ -1024,7 +1024,7 @@ static void check_process_timers(struct task_struct *tsk,
int maxfire;
struct signal_struct *const sig = tsk->signal;
cputime_t utime, stime, ptime, virt_expires, prof_expires;
unsigned long long sched_time, sched_expires;
unsigned long long sum_sched_runtime, sched_expires;
struct task_struct *t;
struct list_head *timers = sig->cpu_timers;
@ -1044,12 +1044,12 @@ static void check_process_timers(struct task_struct *tsk,
*/
utime = sig->utime;
stime = sig->stime;
sched_time = sig->sched_time;
sum_sched_runtime = sig->sum_sched_runtime;
t = tsk;
do {
utime = cputime_add(utime, t->utime);
stime = cputime_add(stime, t->stime);
sched_time += t->sched_time;
sum_sched_runtime += t->se.sum_exec_runtime;
t = next_thread(t);
} while (t != tsk);
ptime = cputime_add(utime, stime);
@ -1090,7 +1090,7 @@ static void check_process_timers(struct task_struct *tsk,
struct cpu_timer_list *t = list_first_entry(timers,
struct cpu_timer_list,
entry);
if (!--maxfire || sched_time < t->expires.sched) {
if (!--maxfire || sum_sched_runtime < t->expires.sched) {
sched_expires = t->expires.sched;
break;
}
@ -1182,7 +1182,7 @@ static void check_process_timers(struct task_struct *tsk,
virt_left = cputime_sub(virt_expires, utime);
virt_left = cputime_div_non_zero(virt_left, nthreads);
if (sched_expires) {
sched_left = sched_expires - sched_time;
sched_left = sched_expires - sum_sched_runtime;
do_div(sched_left, nthreads);
sched_left = max_t(unsigned long long, sched_left, 1);
} else {
@ -1208,7 +1208,7 @@ static void check_process_timers(struct task_struct *tsk,
t->it_virt_expires = ticks;
}
sched = t->sched_time + sched_left;
sched = t->se.sum_exec_runtime + sched_left;
if (sched_expires && (t->it_sched_expires == 0 ||
t->it_sched_expires > sched)) {
t->it_sched_expires = sched;
@ -1300,7 +1300,7 @@ void run_posix_cpu_timers(struct task_struct *tsk)
if (UNEXPIRED(prof) && UNEXPIRED(virt) &&
(tsk->it_sched_expires == 0 ||
tsk->sched_time < tsk->it_sched_expires))
tsk->se.sum_exec_runtime < tsk->it_sched_expires))
return;
#undef UNEXPIRED

36
kernel/sched.c
View file

@ -3156,28 +3156,23 @@ DEFINE_PER_CPU(struct kernel_stat, kstat);
EXPORT_PER_CPU_SYMBOL(kstat);
/*
* This is called on clock ticks and on context switches.
* Bank in p->sched_time the ns elapsed since the last tick or switch.
* Return p->sum_exec_runtime plus any more ns on the sched_clock
* that have not yet been banked in case the task is currently running.
*/
static inline void
update_cpu_clock(struct task_struct *p, struct rq *rq, unsigned long long now)
unsigned long long task_sched_runtime(struct task_struct *p)
{
p->sched_time += now - p->last_ran;
p->last_ran = rq->most_recent_timestamp = now;
}
/*
* Return current->sched_time plus any more ns on the sched_clock
* that have not yet been banked.
*/
unsigned long long current_sched_time(const struct task_struct *p)
{
unsigned long long ns;
unsigned long flags;
u64 ns, delta_exec;
struct rq *rq;
local_irq_save(flags);
ns = p->sched_time + sched_clock() - p->last_ran;
local_irq_restore(flags);
rq = task_rq_lock(p, &flags);
ns = p->se.sum_exec_runtime;
if (rq->curr == p) {
delta_exec = rq_clock(rq) - p->se.exec_start;
if ((s64)delta_exec > 0)
ns += delta_exec;
}
task_rq_unlock(rq, &flags);
return ns;
}
@ -3360,14 +3355,11 @@ out_unlock:
*/
void scheduler_tick(void)
{
unsigned long long now = sched_clock();
struct task_struct *p = current;
int cpu = smp_processor_id();
int idle_at_tick = idle_cpu(cpu);
struct rq *rq = cpu_rq(cpu);
update_cpu_clock(p, rq, now);
if (!idle_at_tick)
task_running_tick(rq, p);
#ifdef CONFIG_SMP
@ -3550,8 +3542,6 @@ switch_tasks:
clear_tsk_need_resched(prev);
rcu_qsctr_inc(task_cpu(prev));
update_cpu_clock(prev, rq, now);
prev->sleep_avg -= run_time;
if ((long)prev->sleep_avg <= 0)
prev->sleep_avg = 0;