diff mbox series

[PATCHv4,3/9] zsmalloc: move away from page order defines

Message ID 20221031054108.541190-4-senozhatsky@chromium.org
State New
Headers
Series zsmalloc/zram: configurable zspage size |

Commit Message

Sergey Senozhatsky Oct. 31, 2022, 5:41 a.m. UTC 
  There is no reason for us to require pages per-zspage to be a
power of two. Rename macros and use plain limit numbers there
instead of 2 ^ N values. This will let us to have more tunable
limits.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
 include/linux/zsmalloc.h | 16 +++++++---------
 mm/zsmalloc.c            |  4 +---
 2 files changed, 8 insertions(+), 12 deletions(-)

Comments

Minchan Kim Nov. 10, 2022, 10:02 p.m. UTC | #1 
On Mon, Oct 31, 2022 at 02:41:02PM +0900, Sergey Senozhatsky wrote:
> There is no reason for us to require pages per-zspage to be a
> power of two. Rename macros and use plain limit numbers there
> instead of 2 ^ N values. This will let us to have more tunable
> limits.
> 
> Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>

Looks good to me.
diff mbox series

Patch

diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h
index 6cd1d95b928a..b6b8654a2d45 100644
--- a/include/linux/zsmalloc.h
+++ b/include/linux/zsmalloc.h
@@ -33,17 +33,15 @@  enum zs_mapmode {
 	 */
 };
 
-#define ZS_PAGE_ORDER_2		2
-#define ZS_PAGE_ORDER_4		4
-
 /*
- * A single 'zspage' is composed of up to 2^N discontiguous 0-order (single)
- * pages. ZS_MAX_PAGE_ORDER defines upper limit on N, ZS_MIN_PAGE_ORDER
- * defines lower limit on N. ZS_DEFAULT_PAGE_ORDER is recommended value.
+ * A single 'zspage' is composed of up to N discontiguous 0-order
+ * (single) pages. ZS_MAX_PAGES_PER_ZSPAGE defines upper limit on N,
+ * ZS_MIN_PAGES_PER_ZSPAGE defines lower limit on N.
+ * ZS_DEFAULT_PAGES_PER_ZSPAGE is a recommended value.
  */
-#define ZS_MIN_PAGE_ORDER	ZS_PAGE_ORDER_2
-#define ZS_MAX_PAGE_ORDER	ZS_PAGE_ORDER_4
-#define ZS_DEFAULT_PAGE_ORDER	ZS_PAGE_ORDER_2
+#define ZS_MIN_PAGES_PER_ZSPAGE	1
+#define ZS_MAX_PAGES_PER_ZSPAGE	16
+#define ZS_DEFAULT_PAGES_PER_ZSPAGE	4
 
 struct zs_pool_stats {
 	/* How many pages were migrated (freed) */
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index a9773566f85b..5f79223e7bfe 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -74,8 +74,6 @@ 
  */
 #define ZS_ALIGN		8
 
-#define ZS_MAX_PAGES_PER_ZSPAGE	(_AC(1, UL) << ZS_MAX_PAGE_ORDER)
-
 #define ZS_HANDLE_SIZE (sizeof(unsigned long))
 
 /*
@@ -2215,7 +2213,7 @@  struct zs_pool *zs_create_pool(const char *name)
 	if (!pool)
 		return NULL;
 
-	num_pages = 1UL << ZS_DEFAULT_PAGE_ORDER;
+	num_pages = ZS_DEFAULT_PAGES_PER_ZSPAGE;
 	/* min_alloc_size must be multiple of ZS_ALIGN */
 	pool->min_alloc_size = num_pages << PAGE_SHIFT >> OBJ_INDEX_BITS;
 	pool->min_alloc_size = max(pool->min_alloc_size, ZS_MIN_ALLOC_SIZE);