diff options
| -rw-r--r-- | include/linux/mmzone.h | 3 | ||||
| -rw-r--r-- | mm/vmstat.c | 28 |
2 files changed, 11 insertions, 20 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index e65d91c02e30..356a814e7c8e 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -282,8 +282,7 @@ struct per_cpu_pageset { struct per_cpu_pages pcp; #ifdef CONFIG_NUMA s8 expire; - s8 numa_stat_threshold; - s8 vm_numa_stat_diff[NR_VM_NUMA_STAT_ITEMS]; + u16 vm_numa_stat_diff[NR_VM_NUMA_STAT_ITEMS]; #endif #ifdef CONFIG_SMP s8 stat_threshold; diff --git a/mm/vmstat.c b/mm/vmstat.c index daea02833e2e..153d8129c155 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -30,6 +30,8 @@ #include "internal.h" +#define NUMA_STATS_THRESHOLD (U16_MAX - 2) + #ifdef CONFIG_VM_EVENT_COUNTERS DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; EXPORT_PER_CPU_SYMBOL(vm_event_states); @@ -194,10 +196,7 @@ void refresh_zone_stat_thresholds(void) per_cpu_ptr(zone->pageset, cpu)->stat_threshold = threshold; -#ifdef CONFIG_NUMA - per_cpu_ptr(zone->pageset, cpu)->numa_stat_threshold - = threshold; -#endif + /* Base nodestat threshold on the largest populated zone. */ pgdat_threshold = per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->stat_threshold; per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->stat_threshold @@ -231,14 +230,9 @@ void set_pgdat_percpu_threshold(pg_data_t *pgdat, continue; threshold = (*calculate_pressure)(zone); - for_each_online_cpu(cpu) { + for_each_online_cpu(cpu) per_cpu_ptr(zone->pageset, cpu)->stat_threshold = threshold; -#ifdef CONFIG_NUMA - per_cpu_ptr(zone->pageset, cpu)->numa_stat_threshold - = threshold; -#endif - } } } @@ -874,16 +868,14 @@ void __inc_numa_state(struct zone *zone, enum numa_stat_item item) { struct per_cpu_pageset __percpu *pcp = zone->pageset; - s8 __percpu *p = pcp->vm_numa_stat_diff + item; - s8 v, t; + u16 __percpu *p = pcp->vm_numa_stat_diff + item; + u16 v; v = __this_cpu_inc_return(*p); - t = __this_cpu_read(pcp->numa_stat_threshold); - if (unlikely(v > t)) { - s8 overstep = t >> 1; - zone_numa_state_add(v + overstep, zone, item); - __this_cpu_write(*p, -overstep); + if (unlikely(v > NUMA_STATS_THRESHOLD)) { + zone_numa_state_add(v, zone, item); + __this_cpu_write(*p, 0); } } @@ -1798,7 +1790,7 @@ static bool need_update(int cpu) BUILD_BUG_ON(sizeof(p->vm_stat_diff[0]) != 1); #ifdef CONFIG_NUMA - BUILD_BUG_ON(sizeof(p->vm_numa_stat_diff[0]) != 1); + BUILD_BUG_ON(sizeof(p->vm_numa_stat_diff[0]) != 2); #endif /* * The fast way of checking if there are any vmstat diffs. |