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

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Message-ID: <AANLkTikNy-vQ2V95dhyQ8k1jkQCiUOukY8ShP_GWM1w6@mail.gmail.com>
Date:	Mon, 14 Feb 2011 12:00:43 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, brgerst@...il.com,
	gorcunov@...il.com, shaohui.zheng@...el.com, rientjes@...gle.com,
	mingo@...e.hu, hpa@...ux.intel.com, ankita@...ibm.com
Subject: Re: [PATCHSET x86/numa] x86-64, NUMA: bring sanity to NUMA emulation

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

Yinghai
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