zsmalloc: account the number of compacted pages

Compaction returns back to zram the number of migrated objects, which is
quite uninformative -- we have objects of different sizes so user space
cannot obtain any valuable data from that number.  Change compaction to
operate in terms of pages and return back to compaction issuer the
number of pages that were freed during compaction.  So from now on we
will export more meaningful value in zram<id>/mm_stat -- the number of
freed (compacted) pages.

This requires:
 (a) a rename of `num_migrated' to 'pages_compacted'
 (b) a internal API change -- return first_page's fullness_group from
     putback_zspage(), so we know when putback_zspage() did
     free_zspage().  It helps us to account compaction stats correctly.

Signed-off-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>

1 files changed, 17 insertions, 10 deletions

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 8f76d88..b7b4a56 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1579,8 +1579,6 @@ struct zs_compact_control {
 	 /* Starting object index within @s_page which used for live object
 	  * in the subpage. */
 	int index;
-	/* How many of objects were migrated */
-	int nr_migrated;
 };
 
 static int migrate_zspage(struct zs_pool *pool, struct size_class *class,
@@ -1617,7 +1615,6 @@ static int migrate_zspage(struct zs_pool *pool, struct size_class *class,
 		record_obj(handle, free_obj);
 		unpin_tag(handle);
 		obj_free(pool, class, used_obj);
-		cc->nr_migrated++;
 	}
 
 	/* Remember last position in this iteration */
@@ -1643,8 +1640,17 @@ static struct page *isolate_target_page(struct size_class *class)
 	return page;
 }
 
-static void putback_zspage(struct zs_pool *pool, struct size_class *class,
-				struct page *first_page)
+/*
+ * putback_zspage - add @first_page into right class's fullness list
+ * @pool: target pool
+ * @class: destination class
+ * @first_page: target page
+ *
+ * Return @fist_page's fullness_group
+ */
+static enum fullness_group putback_zspage(struct zs_pool *pool,
+			struct size_class *class,
+			struct page *first_page)
 {
 	enum fullness_group fullness;
 
@@ -1662,6 +1668,8 @@ static void putback_zspage(struct zs_pool *pool, struct size_class *class,
 
 		free_zspage(first_page);
 	}
+
+	return fullness;
 }
 
 static struct page *isolate_source_page(struct size_class *class)
@@ -1704,7 +1712,6 @@ static void __zs_compact(struct zs_pool *pool, struct size_class *class)
 	struct page *src_page;
 	struct page *dst_page = NULL;
 
-	cc.nr_migrated = 0;
 	spin_lock(&class->lock);
 	while ((src_page = isolate_source_page(class))) {
 
@@ -1733,7 +1740,9 @@ static void __zs_compact(struct zs_pool *pool, struct size_class *class)
 			break;
 
 		putback_zspage(pool, class, dst_page);
-		putback_zspage(pool, class, src_page);
+		if (putback_zspage(pool, class, src_page) == ZS_EMPTY)
+			pool->stats.pages_compacted +=
+				get_pages_per_zspage(class->size);
 		spin_unlock(&class->lock);
 		cond_resched();
 		spin_lock(&class->lock);
@@ -1742,8 +1751,6 @@ static void __zs_compact(struct zs_pool *pool, struct size_class *class)
 	if (src_page)
 		putback_zspage(pool, class, src_page);
 
-	pool->stats.num_migrated += cc.nr_migrated;
-
 	spin_unlock(&class->lock);
 }
 
@@ -1761,7 +1768,7 @@ unsigned long zs_compact(struct zs_pool *pool)
 		__zs_compact(pool, class);
 	}
 
-	return pool->stats.num_migrated;
+	return pool->stats.pages_compacted;
 }
 EXPORT_SYMBOL_GPL(zs_compact);