[PATCH 4/8] staging: zsmalloc: make CLASS_DELTA relative to PAGE_SIZE

Seth Jennings sjenning at linux.vnet.ibm.com
Tue Dec 11 21:56:02 UTC 2012


Right now ZS_SIZE_CLASS_DELTA is hardcoded to be 16.  This
creates 254 classes for systems with 4k pages. However, on
PPC64 with 64k pages, it creates 4095 classes which is far
too many.

This patch makes ZS_SIZE_CLASS_DELTA relative to PAGE_SIZE
so that regardless of the page size, there will be the same
number of classes.

Signed-off-by: Seth Jennings <sjenning at linux.vnet.ibm.com>
---
 drivers/staging/zsmalloc/zsmalloc-main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c
index 825e124..3543047 100644
--- a/drivers/staging/zsmalloc/zsmalloc-main.c
+++ b/drivers/staging/zsmalloc/zsmalloc-main.c
@@ -141,7 +141,7 @@
  *  ZS_MIN_ALLOC_SIZE and ZS_SIZE_CLASS_DELTA must be multiple of ZS_ALIGN
  *  (reason above)
  */
-#define ZS_SIZE_CLASS_DELTA	16
+#define ZS_SIZE_CLASS_DELTA	(PAGE_SIZE >> 8)
 #define ZS_SIZE_CLASSES		((ZS_MAX_ALLOC_SIZE - ZS_MIN_ALLOC_SIZE) / \
 					ZS_SIZE_CLASS_DELTA + 1)
 
-- 
1.7.9.5




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