[PATCH v3 2/8] mm/zsmalloc: take obj index back from find_alloced_obj

[Ganesh Mahendran]

the obj index value should be updated after return from
find_alloced_obj() to avoid CPU burning caused by unnecessary
object scanning.

Signed-off-by: Ganesh Mahendran <opensource.gan...@gmail.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhat...@gmail.com>
Acked-by: Minchan Kim <minc...@kernel.org>
----
v3:
  none
v2:
  - update commit description
---
 mm/zsmalloc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 3a37977..1f144f1 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1744,10 +1744,11 @@ static void zs_object_copy(struct size_class *class, 
unsigned long dst,
  * return handle.
  */
 static unsigned long find_alloced_obj(struct size_class *class,
-                                       struct page *page, int index)
+                                       struct page *page, int *obj_idx)
 {
        unsigned long head;
        int offset = 0;
+       int index = *obj_idx;
        unsigned long handle = 0;
        void *addr = kmap_atomic(page);
 
@@ -1768,6 +1769,9 @@ static unsigned long find_alloced_obj(struct size_class 
*class,
        }
 
        kunmap_atomic(addr);
+
+       *obj_idx = index;
+
        return handle;
 }
 
@@ -1793,7 +1797,7 @@ static int migrate_zspage(struct zs_pool *pool, struct 
size_class *class,
        int ret = 0;
 
        while (1) {
-               handle = find_alloced_obj(class, s_page, obj_idx);
+               handle = find_alloced_obj(class, s_page, &obj_idx);
                if (!handle) {
                        s_page = get_next_page(s_page);
                        if (!s_page)
-- 
1.9.1