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powerpc: support multiple hugepage sizes

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Instead of using the variable mmu_huge_psize to keep track of the huge
page size we use an array of MMU_PAGE_* values.  For each supported huge
page size we need to know the hugepte_shift value and have a
pgtable_cache.  The hstate or an mmu_huge_psizes index is passed to
functions so that they know which huge page size they should use.

The hugepage sizes 16M and 64K are setup(if available on the hardware) so
that they don't have to be set on the boot cmd line in order to use them.
The number of 16G pages have to be specified at boot-time though (e.g.
hugepagesz=16G hugepages=5).

Signed-off-by: Jon Tollefson <[email protected]>
Signed-off-by: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jon Tollefson 2008-07-23 21:27:56 -07:00 • committed by Linus Torvalds
commit 0d9ea75443
9 changed files with 199 additions and 118 deletions
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10
Documentation/kernel-parameters.txt
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@ -776,11 +776,11 @@ and is between 256 and 4096 characters. It is defined in the file
hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
On x86 this option can be specified multiple times
interleaved with hugepages= to reserve huge pages
of different sizes. Valid pages sizes on x86-64
are 2M (when the CPU supports "pse") and 1G (when the
CPU supports the "pdpe1gb" cpuinfo flag)
On x86-64 and powerpc, this option can be specified
multiple times interleaved with hugepages= to reserve
huge pages of different sizes. Valid pages sizes on
x86-64 are 2M (when the CPU supports "pse") and 1G
(when the CPU supports the "pdpe1gb" cpuinfo flag)
Note that 1GB pages can only be allocated at boot time
using hugepages= and not freed afterwards.
default_hugepagesz=