Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754844Ab0D1XW7 (ORCPT ); Wed, 28 Apr 2010 19:22:59 -0400 Received: from mail.vyatta.com ([76.74.103.46]:37814 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753045Ab0D1XW5 (ORCPT ); Wed, 28 Apr 2010 19:22:57 -0400 Date: Wed, 28 Apr 2010 16:22:46 -0700 From: Stephen Hemminger To: Andrew Morton Cc: Matt Mackall , Jack Steiner , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] - Randomize node rotor used in cpuset_mem_spread_node() Message-ID: <20100428162246.7e4632dc@nehalam> In-Reply-To: <20100428161244.5d351395.akpm@linux-foundation.org> References: <20100428131158.GA2648@sgi.com> <20100428150432.GA3137@sgi.com> <20100428154034.fb823484.akpm@linux-foundation.org> <1272495846.21962.1090.camel@calx> <20100428161244.5d351395.akpm@linux-foundation.org> Organization: Vyatta X-Mailer: Claws Mail 3.7.5 (GTK+ 2.18.3; x86_64-pc-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 Content-Length: 1063 Lines: 27 On Wed, 28 Apr 2010 16:12:44 -0700 Andrew Morton wrote: > On Wed, 28 Apr 2010 18:04:06 -0500 > Matt Mackall wrote: > > > > I suspect random32() would suffice here. It avoids depleting the > > > entropy pool altogether. > > > > I wouldn't worry about that. get_random_int() touches the urandom pool, > > which will always leave entropy around. Also, Ted and I decided over a > > year ago that we should drop the whole entropy accounting framework, > > which I'll get around to some rainy weekend. > > hm, so why does random32() exist? Speed? Because I need a cheap fast pseudo-random source for emulation and it got used for more and more non-cryptographic uses. And like most random generators people keep forgetting that it was not intended for security use. -- -- 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/