diff options
| author | Guillaume Chazarain <guichaz@yahoo.fr> | 2008-01-25 21:08:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 21:08:34 +0100 |
| commit | cc203d2422004498909c4886d1b94a2e388d973e (patch) | |
| tree | 10fd9f364bda783b7354cf0e7d04ba319899c079 /kernel | |
| parent | sched: fix rq->clock warps on frequency changes (diff) | |
| download | linux-cc203d2422004498909c4886d1b94a2e388d973e.tar.xz linux-cc203d2422004498909c4886d1b94a2e388d973e.zip | |
sched: monitor clock underflows in /proc/sched_debug
We monitor clock overflows, let's also monitor clock underflows.
Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 6 | ||||
| -rw-r--r-- | kernel/sched_debug.c | 1 |
2 files changed, 5 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 3995d1679858..4d3a5a700866 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -465,7 +465,7 @@ struct rq { u64 clock, prev_clock_raw; s64 clock_max_delta; - unsigned int clock_warps, clock_overflows; + unsigned int clock_warps, clock_overflows, clock_underflows; u64 idle_clock; unsigned int clock_deep_idle_events; u64 tick_timestamp; @@ -3736,8 +3736,10 @@ void scheduler_tick(void) /* * Let rq->clock advance by at least TICK_NSEC: */ - if (unlikely(rq->clock < next_tick)) + if (unlikely(rq->clock < next_tick)) { rq->clock = next_tick; + rq->clock_underflows++; + } rq->tick_timestamp = rq->clock; update_cpu_load(rq); curr->sched_class->task_tick(rq, curr, 0); diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c index 80fbbfc04290..9e5de098d471 100644 --- a/kernel/sched_debug.c +++ b/kernel/sched_debug.c @@ -179,6 +179,7 @@ static void print_cpu(struct seq_file *m, int cpu) PN(prev_clock_raw); P(clock_warps); P(clock_overflows); + P(clock_underflows); P(clock_deep_idle_events); PN(clock_max_delta); P(cpu_load[0]); |