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Commit ad9d5e17 authored by Minchan Kim's avatar Minchan Kim Committed by Linus Torvalds
Browse files

zsmalloc: consider ZS_ALMOST_FULL as migrate source 



There is no reason to prevent select ZS_ALMOST_FULL as migration source
if we cannot find source from ZS_ALMOST_EMPTY.

With this patch, zs_can_compact will return more exact result.

Signed-off-by: default avatarMinchan Kim <minchan.kim@lge.com>
Acked-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 58f17117

mm/zsmalloc.c

+10 −7
Original line number Diff line number Diff line
@@ -1691,11 +1691,17 @@ static enum fullness_group putback_zspage(struct zs_pool *pool, 


static struct page *isolate_source_page(struct size_class *class)

{

	struct page *page;

	int i;

	struct page *page = NULL;



	page = class->fullness_list[ZS_ALMOST_EMPTY];

	if (page)

		remove_zspage(page, class, ZS_ALMOST_EMPTY);

	for (i = ZS_ALMOST_EMPTY; i >= ZS_ALMOST_FULL; i--) {

		page = class->fullness_list[i];

		if (!page)

			continue;



		remove_zspage(page, class, i);

		break;

	}



	return page;

}
@@ -1711,9 +1717,6 @@ static unsigned long zs_can_compact(struct size_class *class) 
{

	unsigned long obj_wasted;



	if (!zs_stat_get(class, CLASS_ALMOST_EMPTY))

		return 0;



	obj_wasted = zs_stat_get(class, OBJ_ALLOCATED) -

		zs_stat_get(class, OBJ_USED);