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Commit 7d3f661e authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Martin Schwidefsky
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[S390] increase default size of vmalloc area 



The default size of the vmalloc area is currently 1 GB. The memory resource
controller uses about 10 MB of vmalloc space per gigabyte of memory. That
turns a system with more than ~100 GB memory unbootable with the default
vmalloc size. It costs us nothing to increase the default size to some
more adequate value, e.g. 128 GB.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 6af7eea2

arch/s390/include/asm/pgtable.h

+3 −3
Original line number Diff line number Diff line
@@ -105,7 +105,7 @@ extern char empty_zero_page[PAGE_SIZE]; 
#ifndef __ASSEMBLY__

/*

 * The vmalloc area will always be on the topmost area of the kernel

 * mapping. We reserve 96MB (31bit) / 1GB (64bit) for vmalloc,

 * mapping. We reserve 96MB (31bit) / 128GB (64bit) for vmalloc,

 * which should be enough for any sane case.

 * By putting vmalloc at the top, we maximise the gap between physical

 * memory and vmalloc to catch misplaced memory accesses. As a side
@@ -120,8 +120,8 @@ extern unsigned long VMALLOC_START; 
#define VMALLOC_END	0x7e000000UL

#define VMEM_MAP_END	0x80000000UL

#else /* __s390x__ */

#define VMALLOC_SIZE	(1UL << 30)

#define VMALLOC_END	0x3e040000000UL

#define VMALLOC_SIZE	(128UL << 30)

#define VMALLOC_END	0x3e000000000UL

#define VMEM_MAP_END	0x40000000000UL

#endif /* __s390x__ */