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author | Guillaume Chazarain <guichaz@yahoo.fr> | 2008-01-25 20:08:34 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 20:08:34 (GMT) |
commit | cc203d2422004498909c4886d1b94a2e388d973e (patch) | |
tree | 10fd9f364bda783b7354cf0e7d04ba319899c079 /kernel/sched.c | |
parent | 782daeee3d596282bfee4cd9e976c86be0e194a8 (diff) | |
download | linux-cc203d2422004498909c4886d1b94a2e388d973e.tar.xz |
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/sched.c')
-rw-r--r-- | kernel/sched.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 3995d16..4d3a5a7 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); |