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-rw-r--r--Documentation/blockdev/zram.txt3
-rw-r--r--drivers/block/zram/zram_drv.c2
-rw-r--r--include/linux/zsmalloc.h4
-rw-r--r--mm/zsmalloc.c27
4 files changed, 22 insertions, 14 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index c4de576093af..62435bb25266 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -144,7 +144,8 @@ mem_used_max RW the maximum amount memory zram have consumed to
store compressed data
mem_limit RW the maximum amount of memory ZRAM can use to store
the compressed data
-num_migrated RO the number of objects migrated migrated by compaction
+pages_compacted RO the number of pages freed during compaction
+ (available only via zram<id>/mm_stat node)
compact WO trigger memory compaction
WARNING
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index bcde5c321090..f1c4bb34e007 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -450,7 +450,7 @@ static ssize_t mm_stat_show(struct device *dev,
zram->limit_pages << PAGE_SHIFT,
max_used << PAGE_SHIFT,
(u64)atomic64_read(&zram->stats.zero_pages),
- pool_stats.num_migrated);
+ pool_stats.pages_compacted);
up_read(&zram->init_lock);
return ret;
diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h
index ad3d23239043..6398dfae53f1 100644
--- a/include/linux/zsmalloc.h
+++ b/include/linux/zsmalloc.h
@@ -35,8 +35,8 @@ enum zs_mapmode {
};
struct zs_pool_stats {
- /* How many objects were migrated */
- unsigned long num_migrated;
+ /* How many pages were migrated (freed) */
+ unsigned long pages_compacted;
};
struct zs_pool;
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 8f76d8875aca..b7b4a5612ec7 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);