Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753353AbZD1STF (ORCPT ); Tue, 28 Apr 2009 14:19:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753086AbZD1SSt (ORCPT ); Tue, 28 Apr 2009 14:18:49 -0400 Received: from qw-out-2122.google.com ([74.125.92.26]:31744 "EHLO qw-out-2122.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752199AbZD1SSs convert rfc822-to-8bit (ORCPT ); Tue, 28 Apr 2009 14:18:48 -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=xZnBo7bko9rRRwKuyoDGAHBcBmcR45/3p/kEzYklLJh2ODzOXp8Ns9NJY8Y+FV3+7R 4016wBb5fwMh8vH5ihNIAGW83/KsAZ/8Vx7nhHPmbWHX6fUYMi/+oj1OfJoEpqy19VBU MNP83+QqBfEbR6haXsnIfk+fXusjfJhiWjWKs= MIME-Version: 1.0 In-Reply-To: <20090428083320.GB17038@localhost> References: <20090428010907.912554629@intel.com> <20090428014920.769723618@intel.com> <20090428065507.GA2024@elte.hu> <20090428083320.GB17038@localhost> Date: Tue, 28 Apr 2009 11:11:52 -0700 Message-ID: <12c511ca0904281111r10f37a5coe5a2750f4dbfbcda@mail.gmail.com> Subject: Re: [PATCH 5/5] proc: export more page flags in /proc/kpageflags From: Tony Luck To: Wu Fengguang Cc: Ingo Molnar , Steven Rostedt , =?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?= , Larry Woodman , Peter Zijlstra , Pekka Enberg , Eduard - Gabriel Munteanu , Andrew Morton , LKML , KOSAKI Motohiro , Andi Kleen , Matt Mackall , Alexey Dobriyan , "linux-mm@kvack.org" 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: 806 Lines: 23 On Tue, Apr 28, 2009 at 1:33 AM, Wu Fengguang wrote: > 1) FAST > > It takes merely 0.2s to scan 4GB pages: > > ? ? ? ?./page-types ?0.02s user 0.20s system 99% cpu 0.216 total OK on a tiny system ... but sounds painful on a big server. 0.2s for 4G scales up to 3 minutes 25 seconds on a 4TB system (4TB systems were being sold two years ago ... so by now the high end will have moved up to 8TB or perhaps 16TB). Would the resulting output be anything but noise on a big system (a *lot* of pages can change state in 3 minutes)? -Tony -- 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/