On Thu, Aug 22, 2013 at 4:49 AM, Dave Jones <davej@xxxxxxxxxx> wrote:
>
> didn't hit the bug_on, but got a bunch of
>
> [ 424.077993] swap_free: Unused swap offset entry 000187d5
> [ 439.377194] swap_free: Unused swap offset entry 000187e7
> [ 441.998411] swap_free: Unused swap offset entry 000187ee
> [ 446.956551] swap_free: Unused swap offset entry 0000245f
>
If page is reused, its swap entry is freed.
reuse_swap_page()
delete_from_swap_cache()
swapcache_free()
count = swap_entry_free(p, entry, SWAP_HAS_CACHE);
If count drops to zero, then swap_free() gives warning.
--- a/mm/memory.c Wed Aug 7 16:29:34 2013
+++ b/mm/memory.c Thu Aug 22 10:44:32 2013
@@ -3123,6 +3123,7 @@ static int do_swap_page(struct mm_struct
/* It's better to call commit-charge after rmap is established */
mem_cgroup_commit_charge_swapin(page, ptr);
+ if (!exclusive)
swap_free(entry);
if (vm_swap_full() || (vma->vm_flags & VM_LOCKED) || PageMlocked(page))
try_to_free_swap(page);
--
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