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

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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: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-09-18 12:25:36 +02:00
parent 97b142b740
commit fc67c880e3
1 changed files with 6 additions and 6 deletions
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12
arch/s390/include/asm/pgtable.h
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@ -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;