diff options
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index b0afd8db139..6247e4a8350 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -263,6 +263,7 @@ struct rq { unsigned int clock_warps, clock_overflows; unsigned int clock_unstable_events; + u64 tick_timestamp; atomic_t nr_iowait; @@ -341,8 +342,11 @@ static void __update_rq_clock(struct rq *rq) /* * Catch too large forward jumps too: */ - if (unlikely(delta > 2*TICK_NSEC)) { - clock++; + if (unlikely(clock + delta > rq->tick_timestamp + TICK_NSEC)) { + if (clock < rq->tick_timestamp + TICK_NSEC) + clock = rq->tick_timestamp + TICK_NSEC; + else + clock++; rq->clock_overflows++; } else { if (unlikely(delta > rq->clock_max_delta)) @@ -3308,9 +3312,16 @@ void scheduler_tick(void) int cpu = smp_processor_id(); struct rq *rq = cpu_rq(cpu); struct task_struct *curr = rq->curr; + u64 next_tick = rq->tick_timestamp + TICK_NSEC; spin_lock(&rq->lock); __update_rq_clock(rq); + /* + * Let rq->clock advance by at least TICK_NSEC: + */ + if (unlikely(rq->clock < next_tick)) + rq->clock = next_tick; + rq->tick_timestamp = rq->clock; update_cpu_load(rq); if (curr != rq->idle) /* FIXME: needed? */ curr->sched_class->task_tick(rq, curr); |