From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with ESMTP id 6FC426B007E for ; Thu, 16 Sep 2010 06:04:37 -0400 (EDT) Subject: Re: Reserved pages in PowerPC From: Benjamin Herrenschmidt In-Reply-To: <20100916052311.GC2332@in.ibm.com> References: <20100916052311.GC2332@in.ibm.com> Content-Type: text/plain; charset="UTF-8" Date: Thu, 16 Sep 2010 20:04:24 +1000 Message-ID: <1284631464.30449.85.camel@pasglop> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Ankita Garg Cc: linuxppc-dev@ozlabs.org, linux-mm@kvack.org List-ID: On Thu, 2010-09-16 at 10:53 +0530, Ankita Garg wrote: > > With some debugging I found that that section has reserved pages. On > instrumenting the memblock_reserve() and reserve_bootmem() routines, I can see > that many of the memory areas are reserved for kernel and initrd by the > memblock reserve() itself. reserve_bootmem then looks at the pages already > reserved and marks them reserved. However, for the very last section, I see > that bootmem reserves it but I am unable to find a corresponding reservation > by the memblock code. It's probably RTAS (firmware runtime services). I'ts instanciated at boot from prom_init and we do favor high addresses for it below 1G iirc. Cheers, Ben. -- 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