linux-kernel - Re: 2.6.21 numa policy and huge pages not working

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Date:	Mon, 11 Jun 2007 11:23:14 -0500
From:	Adam Litke <agl@...ibm.com>
To:	dean gaudet <dean@...tic.org>
Cc:	William Lee Irwin III <wli@...omorphy.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21 numa policy and huge pages not working

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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