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Diffstat (limited to 'mm/vmstat.c')
-rw-r--r--mm/vmstat.c20
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