From: Christoph Lameter 1. Add comments explaining how the function can be called. 2. Collect global diffs in a local array and only spill them once into the global counters when the zone scan is finished. This means that we only touch each global counter once instead of each time we fold cpu counters into zone counters. Signed-off-by: Christoph Lameter Signed-off-by: Andrew Morton --- mm/vmstat.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff -puN mm/vmstat.c~vmstat-small-revisions-to-refresh_cpu_vm_stats mm/vmstat.c --- a/mm/vmstat.c~vmstat-small-revisions-to-refresh_cpu_vm_stats +++ a/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 _