From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751581Ab3FZN3S (ORCPT ); Wed, 26 Jun 2013 09:29:18 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:50593 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751355Ab3FZN3R (ORCPT ); Wed, 26 Jun 2013 09:29:17 -0400 Date: Wed, 26 Jun 2013 06:28:50 -0700 From: Andrew Morton To: Ingo Molnar Cc: Mike Travis , "H. Peter Anvin" , Nathan Zimmer , holt@sgi.com, rob@landley.net, tglx@linutronix.de, mingo@redhat.com, yinghai@kernel.org, gregkh@linuxfoundation.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Linus Torvalds , Peter Zijlstra Subject: Re: [RFC] Transparent on-demand memory setup initialization embedded in the (GFP) buddy allocator Message-Id: <20130626062850.a7ce5806.akpm@linux-foundation.org> In-Reply-To: <20130626092248.GB27025@gmail.com> References: <1371831934-156971-1-git-send-email-nzimmer@sgi.com> <1371831934-156971-3-git-send-email-nzimmer@sgi.com> <20130623092840.GB13445@gmail.com> <20130624203657.GA107621@asylum.americas.sgi.com> <20130625073819.GC11420@gmail.com> <51C9D1D6.20405@sgi.com> <51C9E4B7.2000007@zytor.com> <51C9E6CD.5080508@sgi.com> <20130626092248.GB27025@gmail.com> X-Mailer: Sylpheed 2.7.1 (GTK+ 2.18.9; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 26 Jun 2013 11:22:48 +0200 Ingo Molnar wrote: > except that on 32 TB > systems we don't spend ~2 hours initializing 8,589,934,592 page heads. That's about a million a second which is crazy slow - even my prehistoric desktop is 100x faster than that. Where's all this time actually being spent?