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-rw-r--r--mm/mm_init.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/mm/mm_init.c b/mm/mm_init.c
index c280a02ea11..633c08863fd 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -9,6 +9,8 @@
#include <linux/init.h>
#include <linux/kobject.h>
#include <linux/export.h>
+#include <linux/memory.h>
+#include <linux/notifier.h>
#include "internal.h"
#ifdef CONFIG_DEBUG_MEMORY_INIT
@@ -147,6 +149,51 @@ early_param("mminit_loglevel", set_mminit_loglevel);
struct kobject *mm_kobj;
EXPORT_SYMBOL_GPL(mm_kobj);
+#ifdef CONFIG_SMP
+s32 vm_committed_as_batch = 32;
+
+static void __meminit mm_compute_batch(void)
+{
+ u64 memsized_batch;
+ s32 nr = num_present_cpus();
+ s32 batch = max_t(s32, nr*2, 32);
+
+ /* batch size set to 0.4% of (total memory/#cpus), or max int32 */
+ memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
+
+ vm_committed_as_batch = max_t(s32, memsized_batch, batch);
+}
+
+static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
+ unsigned long action, void *arg)
+{
+ switch (action) {
+ case MEM_ONLINE:
+ case MEM_OFFLINE:
+ mm_compute_batch();
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block compute_batch_nb __meminitdata = {
+ .notifier_call = mm_compute_batch_notifier,
+ .priority = IPC_CALLBACK_PRI, /* use lowest priority */
+};
+
+static int __init mm_compute_batch_init(void)
+{
+ mm_compute_batch();
+ register_hotmemory_notifier(&compute_batch_nb);
+
+ return 0;
+}
+
+__initcall(mm_compute_batch_init);
+
+#endif
+
static int __init mm_sysfs_init(void)
{
mm_kobj = kobject_create_and_add("mm", kernel_kobj);