arm64: lockref: add support for lockless lockrefs using cmpxchg

[~andy/linux] / mm / vmstat.c

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 158ca6494bc6488e134e208f1add00f47ea0dc6b..9bb314577911f50c06848373d273b3b993373858 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -19,6 +19,9 @@
 #include <linux/math64.h>
 #include <linux/writeback.h>
 #include <linux/compaction.h>
+#include <linux/mm_inline.h>
+
+#include "internal.h"
 
 #ifdef CONFIG_VM_EVENT_COUNTERS
 DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}};
@@ -437,33 +440,29 @@ static inline void fold_diff(int *diff)
  * with the global counters. These could cause remote node cache line
  * bouncing and will have to be only done when necessary.
  */
-static void refresh_cpu_vm_stats(int cpu)
+static void refresh_cpu_vm_stats(void)
 {
        struct zone *zone;
        int i;
        int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
 
        for_each_populated_zone(zone) {
-               struct per_cpu_pageset *p;
+               struct per_cpu_pageset __percpu *p = zone->pageset;
 
-               p = per_cpu_ptr(zone->pageset, cpu);
+               for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) {
+                       int v;
 
-               for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
-                       if (p->vm_stat_diff[i]) {
-                               unsigned long flags;
-                               int v;
+                       v = this_cpu_xchg(p->vm_stat_diff[i], 0);
+                       if (v) {
 
-                               local_irq_save(flags);
-                               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;
+                               __this_cpu_write(p->expire, 3);
 #endif
                        }
+               }
                cond_resched();
 #ifdef CONFIG_NUMA
                /*
@@ -473,23 +472,24 @@ static void refresh_cpu_vm_stats(int cpu)
                 * Check if there are pages remaining in this pageset
                 * if not then there is nothing to expire.
                 */
-               if (!p->expire || !p->pcp.count)
+               if (!__this_cpu_read(p->expire) ||
+                              !__this_cpu_read(p->pcp.count))
                        continue;
 
                /*
                 * We never drain zones local to this processor.
                 */
                if (zone_to_nid(zone) == numa_node_id()) {
-                       p->expire = 0;
+                       __this_cpu_write(p->expire, 0);
                        continue;
                }
 
-               p->expire--;
-               if (p->expire)
+
+               if (__this_cpu_dec_return(p->expire))
                        continue;
 
-               if (p->pcp.count)
-                       drain_zone_pages(zone, &p->pcp);
+               if (__this_cpu_read(p->pcp.count))
+                       drain_zone_pages(zone, __this_cpu_ptr(&p->pcp));
 #endif
        }
        fold_diff(global_diff);
@@ -1091,7 +1091,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
                   "\n  all_unreclaimable: %u"
                   "\n  start_pfn:         %lu"
                   "\n  inactive_ratio:    %u",
-                  zone->all_unreclaimable,
+                  !zone_reclaimable(zone),
                   zone->zone_start_pfn,
                   zone->inactive_ratio);
        seq_putc(m, '\n');
@@ -1216,7 +1216,7 @@ int sysctl_stat_interval __read_mostly = HZ;
 
 static void vmstat_update(struct work_struct *w)
 {
-       refresh_cpu_vm_stats(smp_processor_id());
+       refresh_cpu_vm_stats();
        schedule_delayed_work(&__get_cpu_var(vmstat_work),
                round_jiffies_relative(sysctl_stat_interval));
 }