On Wed, 2006-08-30 at 11:01 -0700, Tim Pepper wrote:

On 8/30/06, Andi Kleen [off-list ref] wrote:

quoted

Then it's probably some new problem in hugetlbfs.

It's something subtle though, because I _am_ able to get interleaving
on hugetlbfs with a slightly simplified test case (see previous email)
compared to Nish's.

quoted

Does it work with shmfs?

Haven't tried shmfs, but the following correctly does the expected
interleaving with hugepages (although not hugetlbfs backed):
     shmid = shmget( 0, NR_HUGE_PAGES, IPC_CREAT | SHM_HUGETLB | 0666 );
     shmat_addr = shmat( shmid, NULL, 0 );
     ...
     numa_interleave_memory( shmat_addr, SHM_SIZE, &nm );
I'd expect it works fine with non-huge pages, shmfs.

Actually, the above call will yield hugetlbfs backed huge pages.  The
kernel just prepares the hugetlbfs file for you.  See
hugetlb_zero_setup().

-- 
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center