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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
[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>
authored by Martin Schwidefsky and committed by Martin Schwidefsky 7d3f661e 6af7eea2
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arch/s390/include/asm/pgtable.h
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arch/s390/include/asm/pgtable.h
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#ifndef __ASSEMBLY__
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/*
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* The vmalloc area will always be on the topmost area of the kernel
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* mapping. We reserve 96MB (31bit) / 1GB (64bit) for vmalloc,
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* mapping. We reserve 96MB (31bit) / 128GB (64bit) for vmalloc,
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* which should be enough for any sane case.
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* By putting vmalloc at the top, we maximise the gap between physical
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* memory and vmalloc to catch misplaced memory accesses. As a side
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#define VMALLOC_END 0x7e000000UL
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#define VMEM_MAP_END 0x80000000UL
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#else /* __s390x__ */
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#define VMALLOC_SIZE (1UL << 30)
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#define VMALLOC_END 0x3e040000000UL
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#define VMALLOC_SIZE (128UL << 30)
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#define VMALLOC_END 0x3e000000000UL
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#define VMEM_MAP_END 0x40000000000UL
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#endif /* __s390x__ */
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