Commit d662b8eb authored Jan 25, 2013 by Seth Jennings Committed by Greg Kroah-Hartman Jan 29, 2013

staging: zsmalloc: make CLASS_DELTA relative to PAGE_SIZE



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.

Acked-by: Nitin Gupta <ngupta@vflare.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent e2154544

drivers/staging/zsmalloc/zsmalloc-main.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)