zsmalloc: remove unnecessary insertion/removal of zspage in compaction

In putback_zspage, we don't need to insert a zspage into list of zspage
in size_class again to just fix fullness group. We could do directly
without reinsertion so we could save some instuctions.

Reported-by: Heesub Shin <heesub.shin@samsung.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Seth Jennings <sjennings@variantweb.net>
Cc: Ganesh Mahendran <opensource.ganesh@gmail.com>
Cc: Luigi Semenzato <semenzato@google.com>
Cc: Gunho Lee <gunho.lee@lge.com>
Cc: Juneho Choi <juno.choi@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index a9a9ff2..ded3672 100644 (file)
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1678,14 +1678,14 @@ static struct page *alloc_target_page(struct size_class *class)
 static void putback_zspage(struct zs_pool *pool, struct size_class *class,
                                struct page *first_page)
 {
-       int class_idx;
        enum fullness_group fullness;
 
        BUG_ON(!is_first_page(first_page));
 
-       get_zspage_mapping(first_page, &class_idx, &fullness);
+       fullness = get_fullness_group(first_page);
        insert_zspage(first_page, class, fullness);
-       fullness = fix_fullness_group(class, first_page);
+       set_zspage_mapping(first_page, class->index, fullness);
+
        if (fullness == ZS_EMPTY) {
                zs_stat_dec(class, OBJ_ALLOCATED, get_maxobj_per_zspage(
                        class->size, class->pages_per_zspage));