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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: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2010-04-09 13:43:02 +02:00 committed by Martin Schwidefsky
parent 6af7eea2ae
commit 7d3f661e57
1 changed files with 3 additions and 3 deletions
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6
arch/s390/include/asm/pgtable.h
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@ -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__ */