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authorGanesh Mahendran <opensource.ganesh@gmail.com>2016-07-28 15:47:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-28 16:07:41 -0700
commitcf675acb743f045b7482384be60987e69260e43d (patch)
treedcdea8b15476fbe9e9d07acc68736416c3d4dd27
parent41b88e14c1612be7d4eba18fff1e70d168abe356 (diff)
mm/zsmalloc: take obj index back from find_alloced_obj
the obj index value should be updated after return from find_alloced_obj() to avoid CPU burning caused by unnecessary object scanning. Link: http://lkml.kernel.org/r/1467882338-4300-2-git-send-email-opensource.ganesh@gmail.com Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/zsmalloc.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 0b4790e81193..49143de9934c 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1741,10 +1741,11 @@ 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);
@@ -1765,6 +1766,9 @@ static unsigned long find_alloced_obj(struct size_class *class,
}
kunmap_atomic(addr);
+
+ *obj_idx = index;
+
return handle;
}
@@ -1790,7 +1794,7 @@ 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)