Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755460AbYGGMNL (ORCPT ); Mon, 7 Jul 2008 08:13:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753344AbYGGMM6 (ORCPT ); Mon, 7 Jul 2008 08:12:58 -0400 Received: from py-out-1112.google.com ([64.233.166.179]:63601 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753102AbYGGMM5 (ORCPT ); Mon, 7 Jul 2008 08:12:57 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version:content-type; b=fzuzYknGHslUSCDRIZfHeDaY6URjB/66hB7Ht7OTmIwC0nVWG/HyvPXrsH1cTglwSd 64os7USTP8D9PFM5t+vgiwtQW75vGWuiWbVu7Q0P4SLjTQbcENNfXiV5CUMLEiBDX+XQ uzHDf9Yc9woCxyZKBJeE/wZQ3zoKUM3BOL900= From: Vitaly Mayatskikh To: Vitaly Mayatskikh Cc: Linus Torvalds , Andi Kleen , linux-kernel@vger.kernel.org, Andrew Morton Subject: Re: [PATCH 1/2] Introduce copy_user_handle_tail routine References: <486B8B6C.2050109@firstfloor.org> Date: Mon, 07 Jul 2008 14:12:56 +0200 In-Reply-To: (Vitaly Mayatskikh's message of "Mon, 07 Jul 2008 14:09:10 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 608 Lines: 17 Vitaly Mayatskikh writes: >> one), by limiting the byte-for-byte one to be within a page, but that >> would be a "future enhancement" thing. > > Btw, how much does it cost to CPU to do a fault? Can it be compared with > average time of find_vma()? Remark: this is for preventing fault in memset, not byte-to-byte copy. -- wbr, Vitaly -- 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/