Re: [PATCH 1/2] powerpc: add hugepagesz boot-time parameter

["Nish Aravamudan" <nish.aravamudan@gmail.com>]

On 11/28/07, Randy Dunlap <randy.dunlap@oracle.com> wrote:
> On Tue, 27 Nov 2007 23:03:10 -0600 Jon Tollefson wrote:
>
> > 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 <kniht@linux.vnet.ibm.com>
> > ---
> >
> >  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?

Thanks,
Nish