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authorIngo Molnar <mingo@elte.hu>2007-07-09 18:51:58 +0200
committerIngo Molnar <mingo@elte.hu>2007-07-09 18:51:58 +0200
commit41b86e9c510ae66639bf29d3201e1d2384a7fde6 (patch)
treef340b94f53be08e2fbba2344deb985f9ecb4a036 /kernel/sched.c
parent20d315d42aed95423a7203e1d7e84086004b5a00 (diff)
downloadop-kernel-dev-41b86e9c510ae66639bf29d3201e1d2384a7fde6.zip
op-kernel-dev-41b86e9c510ae66639bf29d3201e1d2384a7fde6.tar.gz
sched: make posix-cpu-timers use CFS's accounting information
update the posix-cpu-timers code to use CFS's CPU accounting information. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c36
1 files changed, 13 insertions, 23 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 29eb227..0333abd 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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;
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