linux-kernel - Re: [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one

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Message-ID: <20090922081631.GD1475@elte.hu>
Date:	Tue, 22 Sep 2009 10:16:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	Nick Piggin <npiggin@...e.de>, Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	linux-ia64 <linux-ia64@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic
	percpu and drop the old one


* Tejun Heo <tj@...nel.org> wrote:

> Hello, all.
> 
> This patchset converts ia64 to dynamic percpu allocator and drop the
> now unused old percpu allocator.  This patchset contains the following
> four patches.
> 
>  0001-vmalloc-rename-local-variables-vmalloc_start-and-vma.patch
>  0002-ia64-allocate-percpu-area-for-cpu0-like-percpu-areas.patch
>  0003-ia64-convert-to-dynamic-percpu-allocator.patch
>  0004-percpu-kill-legacy-percpu-allocator.patch
> 
> 0001 is misc prep to avoid macro / local variable collision.  0002
> makes ia64 allocate percpu area for cpu0 in the same way it does for
> other cpus.  0003 converts ia64 to dynamic percpu allocator and 0004
> drops now unused legacy allocator.
> 
> Contig memory model was verified with ski emulator.  Discontig and
> sparse models were verified on a 4-way SGI altix machine.  I've run
> percpu stress test module for quite a while on the machine.
> 
> Mike Travis, it would be great if you can test this on your machine.
> I'd really like to see how it would behave on a machine with that many
> NUMA nodes.
> 
> This patchset is available in the following git tree.
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git convert-ia64
> 
> Hmmm... kernel.org seems slow to sync today.  If the branch isn't
> mirroreed, please pull from the master.
> 
> Thanks.
> 
>  arch/ia64/Kconfig              |    3 
>  arch/ia64/kernel/setup.c       |   12 --
>  arch/ia64/kernel/vmlinux.lds.S |   11 +-
>  arch/ia64/mm/contig.c          |   87 ++++++++++++++++----
>  arch/ia64/mm/discontig.c       |  120 +++++++++++++++++++++++++--
>  include/linux/percpu.h         |   24 -----
>  kernel/module.c                |  150 ----------------------------------
>  mm/Makefile                    |    4 
>  mm/allocpercpu.c               |  177 -----------------------------------------
>  mm/percpu.c                    |    2 
>  mm/vmalloc.c                   |   16 +--
>  11 files changed, 193 insertions(+), 413 deletions(-)

Kudos, really nice stuff!

	Ingo
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