diff options
| author | Timur Tabi <timur@freescale.com> | 2008-03-26 08:35:32 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-04-07 13:49:22 +1000 |
| commit | 6ccf61f94fbac3e8715f2f938b27cdb3836c1f8c (patch) | |
| tree | 4871071c7d0ff07059652c71e4c70a8753b5b3da /arch | |
| parent | c5d5d94aa54ba1f7691b79336b18804d4b0adf48 (diff) | |
[POWERPC] Enable CONFIG_FORCE_MAX_ZONEORDER for all PowerPC, and make selectable
This enables the FORCE_MAX_ZONEORDER Kconfig option for all PowerPC
systems. Previously, it was enabled only for 64-bit systems. We also
make the option selectable from the menu, so that the user can specify
different values. This is useful for 32-bit systems that need to
allocate more than 4MB of physically contiguous memory.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -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 f43d82dbc323..625342e1a733 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 |