From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with ESMTP id 9735C6B00E7 for ; Sun, 23 Jan 2011 13:06:13 -0500 (EST) Date: Sun, 23 Jan 2011 18:05:32 +0000 From: Russell King - ARM Linux Subject: Re: [PATCH] ARM: mm: Regarding section when dealing with meminfo Message-ID: <20110123180532.GA3509@n2100.arm.linux.org.uk> References: <1295516739-9839-1-git-send-email-pullip.cho@samsung.com> <1295544047.9039.609.camel@nimitz> <20110120180146.GH6335@n2100.arm.linux.org.uk> <1295547087.9039.694.camel@nimitz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1295547087.9039.694.camel@nimitz> Sender: owner-linux-mm@kvack.org To: Dave Hansen Cc: KyongHo Cho , Kukjin Kim , KeyYoung Park , linux-kernel@vger.kernel.org, Ilho Lee , linux-mm@kvack.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org List-ID: On Thu, Jan 20, 2011 at 10:11:27AM -0800, Dave Hansen wrote: > On Thu, 2011-01-20 at 18:01 +0000, Russell King - ARM Linux wrote: > > > The x86 version of show_mem() actually manages to do this without any > > > #ifdefs, and works for a ton of configuration options. It uses > > > pfn_valid() to tell whether it can touch a given pfn. > > > > x86 memory layout tends to be very simple as it expects memory to > > start at the beginning of every region described by a pgdat and extend > > in one contiguous block. I wish ARM was that simple. > > x86 memory layouts can be pretty funky and have been that way for a long > time. That's why we *have* to handle holes in x86's show_mem(). My > laptop even has a ~1GB hole in its ZONE_DMA32: If x86 is soo funky, I suggest you try the x86 version of show_mem() on an ARM platform with memory holes. Make sure you try it with sparsemem as well... -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org