Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759382AbZGIMMf (ORCPT ); Thu, 9 Jul 2009 08:12:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756229AbZGIMM0 (ORCPT ); Thu, 9 Jul 2009 08:12:26 -0400 Received: from mail-gx0-f226.google.com ([209.85.217.226]:57079 "EHLO mail-gx0-f226.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756225AbZGIMMZ convert rfc822-to-8bit (ORCPT ); Thu, 9 Jul 2009 08:12:25 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=RdRTAYhYnvE6HGrKDN38+IyFF8MhY25iQxVVkktzcYqZlvOClls6A4CvLUAzUjw738 tt6XfBkLbuCFgbi97rqkxN5szG1lrctdC8WvXvaFvUxHD41P0fihEPLShsfraniPSUFX Ghfmae9/Vy/5F5JvzdggK64xhpQ/SmgyAr/wE= MIME-Version: 1.0 In-Reply-To: <4A555DA7.6020009@oracle.com> References: <20090623144221.GA29593@suse.de> <4A54A938.5030807@redhat.com> <20090708145625.GA20690@suse.de> <4A54B5C2.9000908@redhat.com> <20090708154758.GB20979@suse.de> <21d7e9970907081423v6d3830eey227f3d54b10382a6@mail.gmail.com> <4A554F1E.5020508@oracle.com> <4A555DA7.6020009@oracle.com> Date: Thu, 9 Jul 2009 20:12:23 +0800 Message-ID: Subject: Re: can we move USB_DEVICEFS to non-embedded? From: Jeff Chua To: Randy Dunlap Cc: Dave Airlie , Greg KH , Peter Jones , Linux Kernel , Linus Torvalds , Scott James Remnant , Kay Sievers , Dave Jones Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1242 Lines: 29 On Thu, Jul 9, 2009 at 11:01 AM, Randy Dunlap wrote: > arch/x86/Kconfig says: > > choice > ? ? ? ?depends on EXPERIMENTAL > ? ? ? ?prompt "Memory split" if EMBEDDED > ? ? ? ?default VMSPLIT_3G > ? ? ? ?depends on X86_32 > ? ? ? ?---help--- > ? ? ? ? ?Select the desired split between kernel and user memory. > > ? ? ? ? ?If the address range available to the kernel is less than the > ? ? ? ? ?physical memory installed, the remaining memory will be available > ? ? ? ? ?as "high memory". Accessing high memory is a little more costly > ? ? ? ? ?than low memory, as it needs to be mapped into the kernel first. > ? ? ? ? ?Note that increasing the kernel address space limits the range > ? ? ? ? ?available to user programs, making the address space there > ? ? ? ? ?tighter. ?Selecting anything other than the default 3G/1G split > ? ? ? ? ?will also likely make your kernel incompatible with binary-only > ? ? ? ? ?kernel modules. Got it. Thanks for the pointer. Jeff. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/