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    SubjectRe: [PATCHSET x86/numa] x86-64, NUMA: bring sanity to NUMA emulation

    * Yinghai Lu <yinghai@kernel.org> wrote:

    > On Mon, Feb 14, 2011 at 11:28 AM, Tejun Heo <tj@kernel.org> wrote:
    > > Hello,
    > >
    > > NUMA emulation is quite convoluted involving unnecessary mapping and
    > > reverse mapping between apicids, PXMs, nodes and memory addresses.
    > > This patchset tries to restore some sanity to the whole thing.
    > >
    > > Tested on an opteron NUMA machine which can do both ACPI and AMD
    > > configs.  All NUMA configs, emulations, !NUMA and UP work as expected.
    > >
    > > This patchset is on top of tip/x86/numa[1] +
    > > bring-sanity-to-NUMA-configuration patchset[2] and contains the
    > > following 7 patches.
    > >
    > >  0001-x86-64-NUMA-Trivial-changes-to-prepare-for-emulation.patch
    > >  0002-x86-64-NUMA-Build-and-use-direct-emulated-nid-phys-n.patch
    > >  0003-x86-64-NUMA-Make-emulation-code-build-numa_meminfo-a.patch
    > >  0004-x86-64-NUMA-Wrap-node-ID-during-emulation.patch
    > >  0005-x86-64-NUMA-Emulate-directly-from-numa_meminfo.patch
    > >  0006-x86-64-NUMA-Unify-emulated-apicid-node-mapping-trans.patch
    > >  0007-x86-64-NUMA-Unify-emulated-distance-mapping.patch
    > >
    > > The patchset is available in the following git branch.
    > >
    > >  git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git x86_64-numa-emu-unify
    > >
    > > Diffstat follows.
    > >
    > >  arch/x86/include/asm/acpi.h    |    6
    > >  arch/x86/include/asm/amd_nb.h  |    4
    > >  arch/x86/include/asm/numa_64.h |    1
    > >  arch/x86/mm/amdtopology_64.c   |   47 ----
    > >  arch/x86/mm/numa_64.c          |  429 ++++++++++++++++++-----------------------
    > >  arch/x86/mm/srat_64.c          |   87 --------
    > >  6 files changed, 197 insertions(+), 377 deletions(-)
    >
    > wonder if numa_emu code could be put into one single file like numa_emu.c

    That would be nice if it can be done sanely.

    We could do it as a delta, on top of these existing patches, to not delay the
    testing of these fixes/improvements, they are looking pretty good (on paper)
    already, do you agree?

    Thanks,

    Ingo
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