From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id CF55F6B0047 for ; Tue, 28 Sep 2010 06:28:58 -0400 (EDT) Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by e28smtp05.in.ibm.com (8.14.4/8.13.1) with ESMTP id o8SASpgb005088 for ; Tue, 28 Sep 2010 15:58:51 +0530 Received: from d28av05.in.ibm.com (d28av05.in.ibm.com [9.184.220.67]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id o8SASpNb4599986 for ; Tue, 28 Sep 2010 15:58:51 +0530 Received: from d28av05.in.ibm.com (loopback [127.0.0.1]) by d28av05.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id o8SASpgI009098 for ; Tue, 28 Sep 2010 20:28:51 +1000 Date: Tue, 28 Sep 2010 15:58:51 +0530 From: Ankita Garg Subject: Re: Reserved pages in PowerPC Message-ID: <20100928102851.GF1990@in.ibm.com> Reply-To: Ankita Garg References: <20100916052311.GC2332@in.ibm.com> <1284631464.30449.85.camel@pasglop> <20100916120806.GJ2332@in.ibm.com> <1284673951.30449.93.camel@pasglop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1284673951.30449.93.camel@pasglop> Sender: owner-linux-mm@kvack.org To: Benjamin Herrenschmidt Cc: linuxppc-dev@ozlabs.org, linux-mm@kvack.org List-ID: Hi Ben, On Fri, Sep 17, 2010 at 07:52:31AM +1000, Benjamin Herrenschmidt wrote: > On Thu, 2010-09-16 at 17:38 +0530, Ankita Garg wrote: > > Thanks Ben for taking a look at this. So I checked the rtas messages > > on > > the serial console and see the following: > > > > instantiating rtas at 0x000000000f632000... done > > > > Which does not correspond to the higher addresses that I see as > > reserved > > (observation on a 16G machine). > > Well, I'd suggest you audit prom_init.c which builds the reserve map, > and the various memblock_reserve() calls in prom.c > I studied and instrumented memblock_reserve() and also reserve_mem(). However, all the reserved addresses seem to correspond to lower memory. I also observed that these reserved addresses are accessed quite rapidly when a workload is being run.. -- Regards, Ankita Garg (ankita@in.ibm.com) Linux Technology Center IBM India Systems & Technology Labs, Bangalore, India -- 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