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SubjectRe: 2.6.21 numa policy and huge pages not working
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On Sat, 2007-06-09 at 21:10 -0700, dean gaudet wrote:
> On Tue, 15 May 2007, William Lee Irwin III wrote:
>
> > On Tue, May 15, 2007 at 10:41:06PM -0700, dean gaudet wrote:
> > > prior to 2.6.21 i could "numactl --interleave=all" and use SHM_HUGETLB and
> > > the interleave policy would be respected. as of 2.6.21 it doesn't seem to
> > > respect the policy on SHM_HUGETLB request.
> > > see test program below.
> > > output from pre-2.6.21:
> > > 2ab196200000 interleave=0-3 file=/2\040(deleted) huge dirty=32 N0=8 N1=8 N2=8 N3=8
> > > 2ab19a200000 default file=/SYSV00000000\040(deleted) dirty=16384 active=0 N0=4096 N1=4096 N2=4096 N3=4096
> > > output from 2.6.21:
> > > 2b49b1c00000 default file=/10\040(deleted) huge dirty=32 N3=32
> > > 2b49b5c00000 default file=/SYSV00000000\040(deleted) dirty=16384 active=0 N0=4096 N1=4096 N2=4096 N3=4096
> > > was this an intentional behaviour change? it seems to be only affecting
> > > SHM_HUGETLB allocations. (i haven't tested hugetlbfs yet.)
> > > run with "numactl --interleave=all ./shmtest"
> >
> > This was not intentional. I'll search for where it broke.
>
> ok i've narrowed it some... maybe.

Thanks a lot for the detailed information. I am on it.

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

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