From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with SMTP id C0AC96B0211 for ; Tue, 18 May 2010 04:05:01 -0400 (EDT) Date: Tue, 18 May 2010 15:56:48 +0800 From: Shaohui Zheng Subject: Re: [RFC, 6/7] NUMA hotplug emulator Message-ID: <20100518075648.GA26105@shaohui> References: <20100513120016.GG2169@shaohui> <20100513165603.GC25212@suse.de> <1273773737.13285.7771.camel@nimitz> <20100513181539.GA26597@suse.de> <1273776578.13285.7820.camel@nimitz> <20100518054121.GA25298@shaohui> <1274167625.17463.17.camel@nimitz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1274167625.17463.17.camel@nimitz> Sender: owner-linux-mm@kvack.org To: Dave Hansen Cc: Greg KH , akpm@linux-foundation.org, linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Andi Kleen , Hidetoshi Seto , Wu Fengguang , Heiko Carstens , linux-kernel@vger.kernel.org, haicheng.li@linux.intel.com, shaohui.zheng@linux.intel.com List-ID: On Tue, May 18, 2010 at 12:27:05AM -0700, Dave Hansen wrote: > On Tue, 2010-05-18 at 13:41 +0800, Shaohui Zheng wrote: > > On Thu, May 13, 2010 at 11:49:38AM -0700, Dave Hansen wrote: > > the configfs was introduced in 2005, you can refer to http://lwn.net/Articles/148973/. > > > > I enabled the configfs, and I see that the configfs is not so popular as we expected, > > I mount configfs to /sys/kernel/config, I get an empty directory. It means that nobody is > > using this file system, it is an interesting thing, is it means that configfs is deprecated? > > If so, it might not be nessarry to develop a configfs interface for hotplug. > > Uh, deprecated? What would make you think that? It does look like the > users are a we bit obscure, but that's a bit far from deprecated. > > > Dave & Greg, > > Can you provide an exmample to use configfs as interface in Linux kernel, I want to get > > a live demo, thanks. > > Heh. There are some great tools out there called cscope and grep. I > have them on my system and I bet you can get them on yours too. > > That said, you're right. There don't seem to be a ton of users of it > these days. But, the LWN article you referenced also pointed to at > least one user. So, please try and put a wee bit of effort into it. I am trying to put a few efforts on it, and we hope to support both sysfs and configfs. because of the history reason, sysfs is more popular. I bet that only vew few users know configfs, so sysfs is still the prefered way. > > 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? :) > > -- Dave Did not try other alternatives until now. Thanks for Dave's suggestions, Systemtap and debugfs seems to be good methods, too. -- Thanks & Regards, Shaohui -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org