This function checks if class compaction will free any pages.
Rephrasing -- do we have enough unused objects to form at least
one ZS_EMPTY page and free it. It aborts compaction if class
compaction will not result in any (further) savings.
EXAMPLE (this debug output is not part of this patch set):
-- class size
-- number of allocated objects
-- number of used objects
-- max objects per zspage
-- pages per zspage
-- estimated number of pages that will be freed
[..]
class-512 objs:544 inuse:540 maxobj-per-zspage:8 pages-per-zspage:1 zspages-to-free:0
... class-512 compaction is useless. break
class-496 objs:660 inuse:570 maxobj-per-zspage:33 pages-per-zspage:4 zspages-to-free:2
class-496 objs:627 inuse:570 maxobj-per-zspage:33 pages-per-zspage:4 zspages-to-free:1
class-496 objs:594 inuse:570 maxobj-per-zspage:33 pages-per-zspage:4 zspages-to-free:0
... class-496 compaction is useless. break
class-448 objs:657 inuse:617 maxobj-per-zspage:9 pages-per-zspage:1 zspages-to-free:4
class-448 objs:648 inuse:617 maxobj-per-zspage:9 pages-per-zspage:1 zspages-to-free:3
class-448 objs:639 inuse:617 maxobj-per-zspage:9 pages-per-zspage:1 zspages-to-free:2
class-448 objs:630 inuse:617 maxobj-per-zspage:9 pages-per-zspage:1 zspages-to-free:1
class-448 objs:621 inuse:617 maxobj-per-zspage:9 pages-per-zspage:1 zspages-to-free:0
... class-448 compaction is useless. break
class-432 objs:728 inuse:685 maxobj-per-zspage:28 pages-per-zspage:3 zspages-to-free:1
class-432 objs:700 inuse:685 maxobj-per-zspage:28 pages-per-zspage:3 zspages-to-free:0
... class-432 compaction is useless. break
class-416 objs:819 inuse:705 maxobj-per-zspage:39 pages-per-zspage:4 zspages-to-free:2
class-416 objs:780 inuse:705 maxobj-per-zspage:39 pages-per-zspage:4 zspages-to-free:1
class-416 objs:741 inuse:705 maxobj-per-zspage:39 pages-per-zspage:4 zspages-to-free:0
... class-416 compaction is useless. break
class-400 objs:690 inuse:674 maxobj-per-zspage:10 pages-per-zspage:1 zspages-to-free:1
class-400 objs:680 inuse:674 maxobj-per-zspage:10 pages-per-zspage:1 zspages-to-free:0
... class-400 compaction is useless. break
class-384 objs:736 inuse:709 maxobj-per-zspage:32 pages-per-zspage:3 zspages-to-free:0
... class-384 compaction is useless. break
[..]
Every "compaction is useless" indicates that we saved CPU cycles.
class-512 has
544 object allocated
540 objects used
8 objects per-page
Even if we have a ALMOST_EMPTY zspage, we still don't have enough room to
migrate all of its objects and free this zspage; so compaction will not
make a lot of sense, it's better to just leave it as is.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
---
mm/zsmalloc.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 036baa8..b7410c1 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1685,6 +1685,28 @@ static struct page *isolate_source_page(struct size_class *class)
return page;
}
+/*
+ *
+ * Based on the number of unused allocated objects calculate
+ * and return the number of pages that we can free.
+ *
+ * Should be called under class->lock.
+ */
+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);
+
+ obj_wasted /= get_maxobj_per_zspage(class->size,
+ class->pages_per_zspage);
+ return obj_wasted * get_pages_per_zspage(class->size);
+}
+
static unsigned long __zs_compact(struct zs_pool *pool,
struct size_class *class)
{
@@ -1698,6 +1720,9 @@ static unsigned long __zs_compact(struct zs_pool *pool,
BUG_ON(!is_first_page(src_page));
+ if (!zs_can_compact(class))
+ break;
+
cc.index = 0;
cc.s_page = src_page;
--
2.4.5
--
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