linux-kernel - Re: [RFC, 3/7] NUMA hotplug emulator

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Message-ID: <20100514020135.GA7678@localhost>
Date:	Fri, 14 May 2010 10:01:35 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	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>,
	David Rientjes <rientjes@...gle.com>,
	Alex Chiang <achiang@...com>, linux-kernel@...r.kernel.org,
	ak@...ux.intel.com, haicheng.li@...ux.intel.com,
	shaohui.zheng@...ux.intel.com
Subject: Re: [RFC, 3/7] NUMA hotplug emulator

On Fri, May 14, 2010 at 09:45:35AM +0800, Zheng, Shaohui wrote:
> On Thu, May 13, 2010 at 09:55:11AM -0700, Greg KH wrote:
> > On Thu, May 13, 2010 at 07:48:35PM +0800, Shaohui Zheng wrote:
> > > Userland interface to hotplug-add fake offlined nodes.
> > 
> > Why include 2 copies of the patch in one email?
> I always try to attach the patch as attachment, it is the same with the mail
> content, I guess it should take convenience when you need to save the patch 
> to local, it might be a bad habbit, I will be careful when I send patch next time.
> thanks for the reminding.

Shaohui, git/quilt are great tools for submitting patch series.

> > 
> > > Add a sysfs entry "probe" under /sys/devices/system/node/:
> > > 
> > >  - to show all fake offlined nodes:
> > >     $ cat /sys/devices/system/node/probe
> > > 
> > >  - to hotadd a fake offlined node, e.g. nodeid is N:
> > >     $ echo N > /sys/devices/system/node/probe
> > 
> > As you are trying to add a new sysfs file, please create the matching
> > Documentation/ABI/ file as well.
> 
> Agree, We will document it in.
> 
> > 
> > Also note that sysfs files are "one value per file", which I don't think
> > this file follows, right?
> 
> Agree, the cpu/probe interface should write only, and we should create another
> file to indicate the hidden nodes, such as cpu/hidden. We will follow this rule
> when we send the formal patch.

I'd prefer to avoid new interfaces if not absolutely necessary.

Thanks,
Fengguang
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