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Subject[PATCH v3 2/8] mm/zsmalloc: take obj index back from find_alloced_obj
Date
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.ganesh@gmail.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@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
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