#include <linux/slab.h>
#include <linux/rbtree.h>
#include <linux/mmu_notifier.h>
+#include <linux/swap.h>
#include <linux/ksm.h>
#include <asm/tlbflush.h>
static unsigned long ksm_rmap_items;
/* Limit on the number of unswappable pages used */
-static unsigned long ksm_max_kernel_pages = 2000;
+static unsigned long ksm_max_kernel_pages;
/* Number of pages ksmd should scan in one batch */
-static unsigned int ksm_thread_pages_to_scan = 200;
+static unsigned int ksm_thread_pages_to_scan = 100;
/* Milliseconds ksmd should sleep between batches */
static unsigned int ksm_thread_sleep_millisecs = 20;
#define KSM_RUN_STOP 0
#define KSM_RUN_MERGE 1
#define KSM_RUN_UNMERGE 2
-static unsigned int ksm_run = KSM_RUN_MERGE;
+static unsigned int ksm_run = KSM_RUN_STOP;
static DECLARE_WAIT_QUEUE_HEAD(ksm_thread_wait);
static DEFINE_MUTEX(ksm_thread_mutex);
struct rmap_item *tree_rmap_item;
int ret;
+ cond_resched();
tree_rmap_item = rb_entry(*new, struct rmap_item, node);
page2[0] = get_mergeable_page(tree_rmap_item);
if (!page2[0])
if (ksm_run != flags) {
ksm_run = flags;
if (flags & KSM_RUN_UNMERGE) {
+ current->flags |= PF_OOM_ORIGIN;
err = unmerge_and_remove_all_rmap_items();
+ current->flags &= ~PF_OOM_ORIGIN;
if (err) {
ksm_run = KSM_RUN_STOP;
count = err;
struct task_struct *ksm_thread;
int err;
+ ksm_max_kernel_pages = totalram_pages / 4;
+
err = ksm_slab_init();
if (err)
goto out;
kthread_stop(ksm_thread);
goto out_free2;
}
+#else
+ ksm_run = KSM_RUN_MERGE; /* no way for user to start it */
+
#endif /* CONFIG_SYSFS */
return 0;