The patch titled
Subject: zsmalloc: consider ZS_ALMOST_FULL as migrate source
has been added to the -mm tree. Its filename is
zsmalloc-consider-zs_almost_full-as-migrate-source.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zsmalloc-consider-zs_almost_full-as-migrate-source.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zsmalloc-consider-zs_almost_full-as-migrate-source.patch
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------------------------------------------------------
From: Minchan Kim <minchan.kim@xxxxxxx>
Subject: 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: Minchan Kim <minchan.kim@xxxxxxx>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zsmalloc.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff -puN mm/zsmalloc.c~zsmalloc-consider-zs_almost_full-as-migrate-source mm/zsmalloc.c
--- a/mm/zsmalloc.c~zsmalloc-consider-zs_almost_full-as-migrate-source
+++ a/mm/zsmalloc.c
@@ -1691,11 +1691,17 @@ static enum fullness_group putback_zspag
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(stru
{
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);
_
Patches currently in -mm which might be from minchan.kim@xxxxxxx are
zsmalloc-consider-zs_almost_full-as-migrate-source.patch
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