diff options
Diffstat (limited to 'mm/mm_init.c')
| -rw-r--r-- | mm/mm_init.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/mm/mm_init.c b/mm/mm_init.c index c280a02ea11e..633c08863fd8 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); |