diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/kernel/hiperdispatch.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/s390/kernel/hiperdispatch.c b/arch/s390/kernel/hiperdispatch.c index 233872d59b76..ed5b2d7d11c4 100644 --- a/arch/s390/kernel/hiperdispatch.c +++ b/arch/s390/kernel/hiperdispatch.c @@ -56,6 +56,7 @@ #define HD_DELAY_FACTOR (4) #define HD_DELAY_INTERVAL (HZ / 4) #define HD_STEAL_THRESHOLD 30 +#define HD_STEAL_AVG_WEIGHT 16 static cpumask_t hd_vl_coremask; /* Mask containing all vertical low COREs */ static cpumask_t hd_vmvl_cpumask; /* Mask containing vertical medium and low CPUs */ @@ -136,6 +137,14 @@ int hd_enable_hiperdispatch(void) return 1; } +static unsigned long hd_steal_avg(unsigned long new) +{ + static unsigned long steal; + + steal = (steal * (HD_STEAL_AVG_WEIGHT - 1) + new) / HD_STEAL_AVG_WEIGHT; + return steal; +} + static unsigned long hd_calculate_steal_percentage(void) { unsigned long time_delta, steal_delta, steal, percentage; @@ -185,7 +194,7 @@ static void hd_capacity_work_fn(struct work_struct *work) mutex_unlock(&smp_cpu_state_mutex); return; } - steal_percentage = hd_calculate_steal_percentage(); + steal_percentage = hd_steal_avg(hd_calculate_steal_percentage()); if (steal_percentage < HD_STEAL_THRESHOLD) new_cores = hd_online_cores; else |