From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from fgwmail5.fujitsu.co.jp (fgwmail5.fujitsu.co.jp [192.51.44.35]) by ozlabs.org (Postfix) with ESMTP id 35018DDD0B for ; Wed, 30 Jan 2008 12:13:54 +1100 (EST) Date: Wed, 30 Jan 2008 10:13:05 +0900 From: Yasunori Goto To: Badari Pulavarty Subject: Re: [-mm PATCH] updates for hotplug memory remove In-Reply-To: <1201653101.19684.6.camel@dyn9047017100.beaverton.ibm.com> References: <20080129120318.5BDF.Y-GOTO@jp.fujitsu.com> <1201653101.19684.6.camel@dyn9047017100.beaverton.ibm.com> Message-Id: <20080130095002.4CCC.Y-GOTO@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Cc: linux-mm , Andrew Morton , linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , > > Have you ever tested hotadd(probe) of the removed memory? > > Yes. I did. In my touch testing, I was able to remove memory and add > it back to the system without any issues. Oh, really!? > But again, I didn't force > the system to use that memory :( Ah..OK. > > > I'm afraid there are some differences of the status between pre hot-add > > section and the removed section by this patch. I think the mem_section of > > removed memory should be invalidated at least. > > I think its a generic issue. Nothing specific for ppc64. Isn't it ? Right. Currently, our machine doesn't have real physical remove feature yet. (only add). So, I think testing is not enough around physical removing. Probably, your box will be first one which can remove physical memory with Linux. It is good for testing. If you notice anything, please let me know. :-) Bye. -- Yasunori Goto