vmstat: remove prefetch
authorChristoph Lameter <clameter@sgi.com>
Tue, 5 Feb 2008 06:29:22 +0000 (22:29 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 5 Feb 2008 17:44:18 +0000 (09:44 -0800)
Remove the prefetch logic in order to avoid touching impossible per cpu
areas.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Mike Travis <travis@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/vmstat.c

index 888668e..422d960 100644 (file)
@@ -21,21 +21,14 @@ EXPORT_PER_CPU_SYMBOL(vm_event_states);
 
 static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask)
 {
-       int cpu = 0;
+       int cpu;
        int i;
 
        memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
 
-       cpu = first_cpu(*cpumask);
-       while (cpu < NR_CPUS) {
+       for_each_cpu_mask(cpu, *cpumask) {
                struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
 
-               cpu = next_cpu(cpu, *cpumask);
-
-               if (cpu < NR_CPUS)
-                       prefetch(&per_cpu(vm_event_states, cpu));
-
-
                for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
                        ret[i] += this->event[i];
        }