Commit fc67c880 authored by Heiko Carstens's avatar Heiko Carstens
Browse files

s390/mm: extend default vmalloc area size to 512GB 



We've seen several occurences in the past where the default vmalloc
size of 128GB is not sufficient. Therefore extend the default size.

Reviewed-by: default avatarClaudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 97b142b7

arch/s390/include/asm/pgtable.h

+6 −6
Original line number Diff line number Diff line
@@ -79,15 +79,15 @@ extern unsigned long zero_page_mask; 


/*

 * The vmalloc and module area will always be on the topmost area of the

 * kernel mapping. We reserve 128GB (64bit) for vmalloc and modules.

 * On 64 bit kernels we have a 2GB area at the top of the vmalloc area where

 * modules will reside. That makes sure that inter module branches always

 * happen without trampolines and in addition the placement within a 2GB frame

 * is branch prediction unit friendly.

 * kernel mapping. 512GB are reserved for vmalloc by default.

 * At the top of the vmalloc area a 2GB area is reserved where modules

 * will reside. That makes sure that inter module branches always

 * happen without trampolines and in addition the placement within a

 * 2GB frame is branch prediction unit friendly.

 */

extern unsigned long VMALLOC_START;

extern unsigned long VMALLOC_END;

#define VMALLOC_DEFAULT_SIZE	((128UL << 30) - MODULES_LEN)

#define VMALLOC_DEFAULT_SIZE	((512UL << 30) - MODULES_LEN)

extern struct page *vmemmap;

extern unsigned long vmemmap_size;