From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261681AbUL0BnP (ORCPT ); Sun, 26 Dec 2004 20:43:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261737AbUL0BnP (ORCPT ); Sun, 26 Dec 2004 20:43:15 -0500 Received: from smtprelay01.ispgateway.de ([80.67.18.13]:14792 "EHLO smtprelay01.ispgateway.de") by vger.kernel.org with ESMTP id S261681AbUL0BlS (ORCPT ); Sun, 26 Dec 2004 20:41:18 -0500 From: Ingo Oeser To: linux-kernel@vger.kernel.org Subject: Re: Prezeroing V2 [3/4]: Add support for ZEROED and NOT_ZEROED free maps Date: Mon, 27 Dec 2004 02:37:46 +0100 User-Agent: KMail/1.6.2 Cc: Florian Weimer , Linus Torvalds , 7eggert@gmx.de, Christoph Lameter , akpm@osdl.org, linux-ia64@vger.kernel.org, linux-mm@kvack.org References: <87llbk63sn.fsf@deneb.enyo.de> In-Reply-To: <87llbk63sn.fsf@deneb.enyo.de> MIME-Version: 1.0 Content-Disposition: inline Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200412270237.53368.ioe-lkml@rameria.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Monday 27 December 2004 00:24, Florian Weimer wrote: > By the way, some crazy idea that occurred to me: What about > incrementally scrubbing a page which has been assigned previously to > this CPU, while spinning inside spinlocks (or busy-waiting somewhere > else)? Crazy idea, indeed. spinlocks are like safety belts: You should actually not need them in the normal case, but they will save your butt and you'll be glad you have them, when they actually trigger. So if you are making serious progress here, you have just uncovered a spinlockcontention problem in the kernel ;-) Regards Ingo Oeser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFBz2dvU56oYWuOrkARAvc+AJ0RpaIg6JzC28B8SOXE3irCBtaTVgCg1eas 5zACIzV2CtvlNvg6Bit+/G8= =rdE7 -----END PGP SIGNATURE-----