linux-kernel - Re: [PATCHSET x86/numa] x86-64, NUMA: bring sanity to NUMA emulation

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Message-ID: <20110215022842.GD31134@elte.hu>
Date:	Tue, 15 Feb 2011 03:28:42 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	x86@...nel.org, brgerst@...il.com, gorcunov@...il.com,
	shaohui.zheng@...el.com, rientjes@...gle.com, hpa@...ux.intel.com,
	ankita@...ibm.com
Subject: Re: [PATCHSET x86/numa] x86-64, NUMA: bring sanity to NUMA emulation


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

> On Mon, Feb 14, 2011 at 11:28 AM, Tejun Heo <tj@...nel.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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