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Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index f43d82dbc32..625342e1a73 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -211,14 +211,25 @@ source kernel/Kconfig.hz source kernel/Kconfig.preempt source "fs/Kconfig.binfmt" -# We optimistically allocate largepages from the VM, so make the limit -# large enough (16MB). This badly named config option is actually -# max order + 1 config FORCE_MAX_ZONEORDER - int - depends on PPC64 + int "Maximum zone order" default "9" if PPC_64K_PAGES - default "13" + default "13" if PPC64 + default "11" + help + The kernel memory allocator divides physically contiguous memory + blocks into "zones", where each zone is a power of two number of + pages. This option selects the largest power of two that the kernel + keeps in the memory allocator. If you need to allocate very large + blocks of physically contiguous memory, then you may need to + increase this value. + + This config option is actually maximum order plus one. For example, + a value of 11 means that the largest free memory block is 2^10 pages. + + The page size is not necessarily 4KB. For example, on 64-bit + systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep + this in mind when choosing a value for this option. config HUGETLB_PAGE_SIZE_VARIABLE bool |