diff options
| -rw-r--r-- | mm/vmstat.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c index e8d846f57774..9ffc573ceb6e 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -284,6 +284,10 @@ EXPORT_SYMBOL(dec_zone_page_state); /* * Update the zone counters for one cpu. * + * The cpu specified must be either the current cpu or a processor that + * is not online. If it is the current cpu then the execution thread must + * be pinned to the current cpu. + * * Note that refresh_cpu_vm_stats strives to only access * node local memory. The per cpu pagesets on remote zones are placed * in the memory local to the processor using that pageset. So the @@ -299,7 +303,7 @@ void refresh_cpu_vm_stats(int cpu) { struct zone *zone; int i; - unsigned long flags; + int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; for_each_zone(zone) { struct per_cpu_pageset *p; @@ -311,15 +315,19 @@ void refresh_cpu_vm_stats(int cpu) for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) if (p->vm_stat_diff[i]) { + unsigned long flags; + int v; + local_irq_save(flags); - zone_page_state_add(p->vm_stat_diff[i], - zone, i); + v = p->vm_stat_diff[i]; p->vm_stat_diff[i] = 0; + local_irq_restore(flags); + atomic_long_add(v, &zone->vm_stat[i]); + global_diff[i] += v; #ifdef CONFIG_NUMA /* 3 seconds idle till flush */ p->expire = 3; #endif - local_irq_restore(flags); } #ifdef CONFIG_NUMA /* @@ -351,6 +359,10 @@ void refresh_cpu_vm_stats(int cpu) drain_zone_pages(zone, p->pcp + 1); #endif } + + for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) + if (global_diff[i]) + atomic_long_add(global_diff[i], &vm_stat[i]); } #endif |