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-rw-r--r--mm/vmstat.c171
1 files changed, 89 insertions, 82 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c
index ee7f89666250..73b83d67bab6 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -13,66 +13,6 @@
#include <linux/mm.h>
#include <linux/module.h>
-/*
- * Accumulate the page_state information across all CPUs.
- * The result is unavoidably approximate - it can change
- * during and after execution of this function.
- */
-DEFINE_PER_CPU(struct page_state, page_states) = {0};
-
-static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
-{
- unsigned cpu;
-
- memset(ret, 0, nr * sizeof(unsigned long));
- cpus_and(*cpumask, *cpumask, cpu_online_map);
-
- for_each_cpu_mask(cpu, *cpumask) {
- unsigned long *in;
- unsigned long *out;
- unsigned off;
- unsigned next_cpu;
-
- in = (unsigned long *)&per_cpu(page_states, cpu);
-
- next_cpu = next_cpu(cpu, *cpumask);
- if (likely(next_cpu < NR_CPUS))
- prefetch(&per_cpu(page_states, next_cpu));
-
- out = (unsigned long *)ret;
- for (off = 0; off < nr; off++)
- *out++ += *in++;
- }
-}
-
-void get_full_page_state(struct page_state *ret)
-{
- cpumask_t mask = CPU_MASK_ALL;
-
- __get_page_state(ret, sizeof(*ret) / sizeof(unsigned long), &mask);
-}
-
-void __mod_page_state_offset(unsigned long offset, unsigned long delta)
-{
- void *ptr;
-
- ptr = &__get_cpu_var(page_states);
- *(unsigned long *)(ptr + offset) += delta;
-}
-EXPORT_SYMBOL(__mod_page_state_offset);
-
-void mod_page_state_offset(unsigned long offset, unsigned long delta)
-{
- unsigned long flags;
- void *ptr;
-
- local_irq_save(flags);
- ptr = &__get_cpu_var(page_states);
- *(unsigned long *)(ptr + offset) += delta;
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(mod_page_state_offset);
-
void __get_zone_counts(unsigned long *active, unsigned long *inactive,
unsigned long *free, struct pglist_data *pgdat)
{
@@ -106,6 +46,63 @@ void get_zone_counts(unsigned long *active,
}
}
+#ifdef CONFIG_VM_EVENT_COUNTERS
+DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}};
+EXPORT_PER_CPU_SYMBOL(vm_event_states);
+
+static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask)
+{
+ int cpu = 0;
+ int i;
+
+ memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
+
+ cpu = first_cpu(*cpumask);
+ while (cpu < NR_CPUS) {
+ 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];
+ }
+}
+
+/*
+ * Accumulate the vm event counters across all CPUs.
+ * The result is unavoidably approximate - it can change
+ * during and after execution of this function.
+*/
+void all_vm_events(unsigned long *ret)
+{
+ sum_vm_events(ret, &cpu_online_map);
+}
+
+#ifdef CONFIG_HOTPLUG
+/*
+ * Fold the foreign cpu events into our own.
+ *
+ * This is adding to the events on one processor
+ * but keeps the global counts constant.
+ */
+void vm_events_fold_cpu(int cpu)
+{
+ struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu);
+ int i;
+
+ for (i = 0; i < NR_VM_EVENT_ITEMS; i++) {
+ count_vm_events(i, fold_state->event[i]);
+ fold_state->event[i] = 0;
+ }
+}
+#endif /* CONFIG_HOTPLUG */
+
+#endif /* CONFIG_VM_EVENT_COUNTERS */
+
/*
* Manage combined zone based / global counters
*
@@ -405,16 +402,16 @@ static char *vmstat_text[] = {
"numa_other",
#endif
- /* Event counters */
+#ifdef CONFIG_VM_EVENT_COUNTERS
"pgpgin",
"pgpgout",
"pswpin",
"pswpout",
- "pgalloc_high",
- "pgalloc_normal",
- "pgalloc_dma32",
"pgalloc_dma",
+ "pgalloc_dma32",
+ "pgalloc_normal",
+ "pgalloc_high",
"pgfree",
"pgactivate",
@@ -423,25 +420,25 @@ static char *vmstat_text[] = {
"pgfault",
"pgmajfault",
- "pgrefill_high",
- "pgrefill_normal",
- "pgrefill_dma32",
"pgrefill_dma",
+ "pgrefill_dma32",
+ "pgrefill_normal",
+ "pgrefill_high",
- "pgsteal_high",
- "pgsteal_normal",
- "pgsteal_dma32",
"pgsteal_dma",
+ "pgsteal_dma32",
+ "pgsteal_normal",
+ "pgsteal_high",
- "pgscan_kswapd_high",
- "pgscan_kswapd_normal",
- "pgscan_kswapd_dma32",
"pgscan_kswapd_dma",
+ "pgscan_kswapd_dma32",
+ "pgscan_kswapd_normal",
+ "pgscan_kswapd_high",
- "pgscan_direct_high",
- "pgscan_direct_normal",
- "pgscan_direct_dma32",
"pgscan_direct_dma",
+ "pgscan_direct_dma32",
+ "pgscan_direct_normal",
+ "pgscan_direct_high",
"pginodesteal",
"slabs_scanned",
@@ -451,6 +448,7 @@ static char *vmstat_text[] = {
"allocstall",
"pgrotated",
+#endif
};
/*
@@ -553,23 +551,32 @@ struct seq_operations zoneinfo_op = {
static void *vmstat_start(struct seq_file *m, loff_t *pos)
{
unsigned long *v;
- struct page_state *ps;
+#ifdef CONFIG_VM_EVENT_COUNTERS
+ unsigned long *e;
+#endif
int i;
if (*pos >= ARRAY_SIZE(vmstat_text))
return NULL;
+#ifdef CONFIG_VM_EVENT_COUNTERS
v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long)
- + sizeof(*ps), GFP_KERNEL);
+ + sizeof(struct vm_event_state), GFP_KERNEL);
+#else
+ v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long),
+ GFP_KERNEL);
+#endif
m->private = v;
if (!v)
return ERR_PTR(-ENOMEM);
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
v[i] = global_page_state(i);
- ps = (struct page_state *)(v + NR_VM_ZONE_STAT_ITEMS);
- get_full_page_state(ps);
- ps->pgpgin /= 2; /* sectors -> kbytes */
- ps->pgpgout /= 2;
+#ifdef CONFIG_VM_EVENT_COUNTERS
+ e = v + NR_VM_ZONE_STAT_ITEMS;
+ all_vm_events(e);
+ e[PGPGIN] /= 2; /* sectors -> kbytes */
+ e[PGPGOUT] /= 2;
+#endif
return v + *pos;
}