On 11/28/07, Randy Dunlap [off-list ref] wrote:

Nish Aravamudan wrote:

quoted

On 11/28/07, Randy Dunlap [off-list ref] wrote:

quoted

On Tue, 27 Nov 2007 23:03:10 -0600 Jon Tollefson wrote:

quoted

This patch adds the hugepagesz boot-time parameter for ppc64 that lets
you pick the size for your huge pages.  The choices available are 64K
and 16M.  It defaults to 16M (previously the only choice) if nothing or
an invalid choice is specified.  Tested 64K huge pages with the
libhugetlbfs 1.2 release with its 'make func' and 'make stress' test
invocations.

This patch requires the patch posted by Mel Gorman that adds
HUGETLB_PAGE_SIZE_VARIABLE; "[PATCH] Fix boot problem with iSeries
lacking hugepage support" on 2007-11-15.

Signed-off-by: Jon Tollefson <redacted>
---

 Documentation/kernel-parameters.txt |    1
 arch/powerpc/mm/hash_utils_64.c     |   11 +--------
 arch/powerpc/mm/hugetlbpage.c       |   41 ++++++++++++++++++++++++++++++++++++
 include/asm-powerpc/mmu-hash64.h    |    1
 mm/hugetlb.c                        |    1
 5 files changed, 46 insertions(+), 9 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 33121d6..2fc1fb8 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt

@@ -685,6 +685,7 @@ and is between 256 and 4096 characters. It is defined in the file
                      See Documentation/isdn/README.HiSax.

      hugepages=      [HW,X86-32,IA-64] Maximal number of HugeTLB pages.
+     hugepagesz=     [HW,IA-64,PPC] The size of the HugeTLB pages.

Any chance of spelling it as "hugepagesize" so that it's a little
less cryptic and more difficult to typo as "hugepages"?
(i.e., less confusion between them)

It already exists as hugepagesz= for IA64. Changing it to hugepagesize
would either make ppc be different than IA64, or require keeping both
so as to make IA64 setups continue working as before?

Oh, but it wasn't in Doc/kernel-parameters.txt ?  :(

Nope :( I wonder how many other kernel parameters are in the same
boat? Where's an RPJDay-script when you need it?

OK, just leave it as is, I think.

Yeah, I guess that's probably easiest...unfortunately.

-Nish