From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 2 Jan 2008 12:58:45 -0800 (PST) From: Christoph Lameter Subject: Re: [PATCH 05/10] x86_64: Use generic percpu In-Reply-To: <200712290255.40233.ak@suse.de> Message-ID: References: <20071228001046.854702000@sgi.com> <200712281354.52453.ak@suse.de> <47757311.5050503@sgi.com> <200712290255.40233.ak@suse.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andi Kleen Cc: Mike Travis , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Rusty Russell , tglx@linutronix.de, mingo@redhat.com List-ID: On Sat, 29 Dec 2007, Andi Kleen wrote: > Anyways the difference between the x86 percpu.h and the generic one is > that x86-64 uses a short cut through the PDA to get the current cpu > offset for the current CPU case. The generic one goes through > smp_processor_id()->array reference instead. No the patch also uses the pda. > I would request that this optimization is not being removed > without suitable replacement in the same patchkit. The optimization was not removed __my_cpu_offset is used to calculate the current offset which is using the pda. #define __my_cpu_offset read_pda(data_offset) -- 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