diff options
| author | Mike Galbraith <efault@gmx.de> | 2009-11-04 17:53:50 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-11-04 19:13:48 +0100 |
| commit | 1b9508f6831e10d53256825de8904caa22d1ca2c (patch) | |
| tree | 1b9f62947a75432000cfe46b22071d2b09e5899a /kernel/sched.c | |
| parent | a1f84a3ab8e002159498814eaa7e48c33752b04b (diff) | |
sched: Rate-limit newidle
Rate limit newidle to migration_cost. It's a win for all
stages of sysbench oltp tests.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index ae026aad145..f8492123b5d 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -589,6 +589,8 @@ struct rq { u64 rt_avg; u64 age_stamp; + u64 idle_stamp; + u64 avg_idle; #endif /* calc_load related fields */ @@ -2353,6 +2355,17 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, if (rq != orig_rq) update_rq_clock(rq); + if (rq->idle_stamp) { + u64 delta = rq->clock - rq->idle_stamp; + u64 max = 2*sysctl_sched_migration_cost; + + if (delta > max) + rq->avg_idle = max; + else + update_avg(&rq->avg_idle, delta); + rq->idle_stamp = 0; + } + WARN_ON(p->state != TASK_WAKING); cpu = task_cpu(p); @@ -4389,6 +4402,11 @@ static void idle_balance(int this_cpu, struct rq *this_rq) int pulled_task = 0; unsigned long next_balance = jiffies + HZ; + this_rq->idle_stamp = this_rq->clock; + + if (this_rq->avg_idle < sysctl_sched_migration_cost) + return; + for_each_domain(this_cpu, sd) { unsigned long interval; @@ -4403,8 +4421,10 @@ static void idle_balance(int this_cpu, struct rq *this_rq) interval = msecs_to_jiffies(sd->balance_interval); if (time_after(next_balance, sd->last_balance + interval)) next_balance = sd->last_balance + interval; - if (pulled_task) + if (pulled_task) { + this_rq->idle_stamp = 0; break; + } } if (pulled_task || time_after(jiffies, this_rq->next_balance)) { /* |