linux-kernel - Re: [RFC, 6/7] NUMA hotplug emulator

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Message-ID: <4BF255F3.9040002@linux.intel.com>
Date:	Tue, 18 May 2010 10:55:15 +0200
From:	Andi Kleen <ak@...ux.intel.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
CC:	Shaohui Zheng <shaohui.zheng@...el.com>, Greg KH <gregkh@...e.de>,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-kernel@...r.kernel.org, haicheng.li@...ux.intel.com,
	shaohui.zheng@...ux.intel.com
Subject: Re: [RFC, 6/7] NUMA hotplug emulator

>
> Maybe configfs isn't the way to go.  I just think extending the 'probe'
> file is a bad idea, especially in the way your patch did it.  I'm open
> to other alternatives.  Since this is only for testing, perhaps debugfs
> applies better.  What other alternatives have you explored?  How about a
> Systemtap set to do it? :)

First this is a debugging interface. It doesn't need to have the
most pretty interface in the world, because it will be only used for
QA by a few people.

Requiring setting parameters in two different file systems doesn't
sound that appealing to me.

systemtap for configuration also doesn't seem right.

I liked Dave's earlier proposal to do a command line parameter like interface
for "probe". Perhaps that can be done. It shouldn't need a lot of code.

In fact there are already two different parser libraries for this:
lib/parser.c and lib/params.c. One could chose the one that one likes
better :-)

Anything that needs a lot of code is a bad idea for this I think.
A simple parser using one of the existing libraries should be simple
enough though.

Again it's just a QA interface, not the next generation of POSIX.

-Andi

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