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Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index ca75b9e7c09f..b0f56603b9be 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -16,6 +16,7 @@
#include <linux/namei.h>
#include <linux/shm.h>
#include <linux/blkdev.h>
+#include <linux/random.h>
#include <linux/writeback.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
@@ -1806,6 +1807,11 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
goto bad_swap;
}
+ if (blk_queue_nonrot(bdev_get_queue(p->bdev))) {
+ p->flags |= SWP_SOLIDSTATE;
+ srandom32((u32)get_seconds());
+ p->cluster_next = 1 + (random32() % p->highest_bit);
+ }
if (discard_swap(p) == 0)
p->flags |= SWP_DISCARDABLE;
@@ -1822,10 +1828,11 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
total_swap_pages += nr_good_pages;
printk(KERN_INFO "Adding %uk swap on %s. "
- "Priority:%d extents:%d across:%lluk%s\n",
+ "Priority:%d extents:%d across:%lluk %s%s\n",
nr_good_pages<<(PAGE_SHIFT-10), name, p->prio,
nr_extents, (unsigned long long)span<<(PAGE_SHIFT-10),
- (p->flags & SWP_DISCARDABLE) ? " D" : "");
+ (p->flags & SWP_SOLIDSTATE) ? "SS" : "",
+ (p->flags & SWP_DISCARDABLE) ? "D" : "");
/* insert swap space into swap_list: */
prev = -1;