diff options
Diffstat (limited to 'kernel/sched/hmp.c')
| -rw-r--r-- | kernel/sched/hmp.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/kernel/sched/hmp.c b/kernel/sched/hmp.c index b2f3013bfe31..95e618ee1124 100644 --- a/kernel/sched/hmp.c +++ b/kernel/sched/hmp.c @@ -961,6 +961,13 @@ sched_long_cpu_selection_threshold = 100 * NSEC_PER_MSEC; unsigned int __read_mostly sysctl_sched_restrict_cluster_spill; +/* + * Scheduler tries to avoid waking up idle CPUs for tasks running + * in short bursts. If the task average burst is less than + * sysctl_sched_short_burst nanoseconds, it is eligible for packing. + */ +unsigned int __read_mostly sysctl_sched_short_burst; + static void _update_up_down_migrate(unsigned int *up_migrate, unsigned int *down_migrate) { @@ -1553,7 +1560,13 @@ void init_new_task_load(struct task_struct *p, bool idle_task) memset(&p->ravg, 0, sizeof(struct ravg)); p->cpu_cycles = 0; p->ravg.curr_burst = 0; - p->ravg.avg_burst = 0; + /* + * Initialize the avg_burst to twice the threshold, so that + * a task would not be classified as short burst right away + * after fork. It takes at least 6 sleep-wakeup cycles for + * the avg_burst to go below the threshold. + */ + p->ravg.avg_burst = 2 * (u64)sysctl_sched_short_burst; p->ravg.curr_window_cpu = kcalloc(nr_cpu_ids, sizeof(u32), GFP_KERNEL); p->ravg.prev_window_cpu = kcalloc(nr_cpu_ids, sizeof(u32), GFP_KERNEL); @@ -2987,6 +3000,8 @@ void reset_task_stats(struct task_struct *p) p->ravg.curr_window_cpu = curr_window_ptr; p->ravg.prev_window_cpu = prev_window_ptr; + p->ravg.avg_burst = 2 * (u64)sysctl_sched_short_burst; + /* Retain EXITING_TASK marker */ p->ravg.sum_history[0] = sum; } |