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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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36
kernel/sched.c
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@@ -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 @@ static void task_running_tick(struct rq *rq, struct task_struct *p)
*/
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 @@ asmlinkage void __sched schedule(void)
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;