diff options
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index ec0569e59e24..ae2d4b08e782 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -46,7 +46,7 @@ const_debug unsigned int sysctl_sched_child_runs_first = 1; * Minimal preemption granularity for CPU-bound tasks: * (default: 2 msec, units: nanoseconds) */ -unsigned int sysctl_sched_min_granularity __read_mostly = 2000000ULL; +const_debug unsigned int sysctl_sched_nr_latency = 20; /* * sys_sched_yield() compat mode @@ -222,8 +222,7 @@ static inline struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq) static u64 __sched_period(unsigned long nr_running) { u64 period = sysctl_sched_latency; - unsigned long nr_latency = - sysctl_sched_latency / sysctl_sched_min_granularity; + unsigned long nr_latency = sysctl_sched_nr_latency; if (unlikely(nr_running > nr_latency)) { period *= nr_running; @@ -245,11 +244,15 @@ static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se) static u64 __sched_vslice(unsigned long nr_running) { - u64 period = __sched_period(nr_running); + unsigned long period = sysctl_sched_latency; + unsigned long nr_latency = sysctl_sched_nr_latency; - do_div(period, nr_running); + if (unlikely(nr_running > nr_latency)) + nr_running = nr_latency; - return period; + period /= nr_running; + + return (u64)period; } /* |