From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4470DC433E0 for ; Fri, 12 Jun 2020 16:01:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1ADF3207F7 for ; Fri, 12 Jun 2020 16:01:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="my5eY2yc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726327AbgFLQBS (ORCPT ); Fri, 12 Jun 2020 12:01:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41872 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726268AbgFLQBR (ORCPT ); Fri, 12 Jun 2020 12:01:17 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30AE1C03E96F for ; Fri, 12 Jun 2020 09:01:17 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id k1so3814671pls.2 for ; Fri, 12 Jun 2020 09:01:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=8arUOApLiXDRUGCMIRF3WITWesa059DBqowSaJoP3kg=; b=my5eY2ycooXFvDMr0LtDM+kEGSVSJON/nRXck6cJWtWaIvr79zLH9d5AaK9o2wxpjG R0+znBSCLwP73h9oARXj0WqD2Z2JyPWOUqIuW2K67Dx0xEFL40Nq3/cTS2U6leGwAVeS wg3TtmCvTNn84lFYU1JH7E8HUps+G7lLxw93BgFo9DY9xpTdQLS6HWpbhY2Dahe8xFvG uFIvsGL0xoAGUzG8/xpt/1dUj/W8qYiCfz/kZaqv77dkNoBIeuIoRj4H+4iLL87M/X/Z 8T8BwdULYyr3fhtNVYHMhLbOJ5II+7xWeUK7ESCoRhhPs2r+lEFAaX+HLvY+vne1WGDA JKjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=8arUOApLiXDRUGCMIRF3WITWesa059DBqowSaJoP3kg=; b=MiCUmOyRdo7GtSfXdGNK3P0c5ULi1qiPEYbn+O30qS6sXHS111wy0PWjuUpnDFQjrS NbxvRcgcf2Hwq6OPkymtk5s9y8hv5/InAq7ttXVdMcky7bhd+hlpEVCM9p1d/bRiFdof oPN6WlPNXjgigZKIiVcxPSK6tEd3+nHiKo0auY8QMdMlsyTXo/RHtnWM5RA/ct1YRkEh 6+Ze009tZ5a4c0id4AYQWC56y2/Pufcu6NhRCbYc8guc8XihANUh+2DFzugorT7seQiY 7EX1OfSgyQIBK0GF1HQZxTosfEfmPKgh74wGz/z0wZqQSFjM2ko9FJLhclpn0AlqrodQ eOxg== X-Gm-Message-State: AOAM533OCr3BQa+hnKt5+Qq1SqyAsrbnMPFR/IM8rOFZpg9PLsPcSzCc tUjzKl/4I+WegIW2alkz1fY= X-Google-Smtp-Source: ABdhPJwP1eHttivf0/PWqEs9M6GPvKgYt8tIyp75MZaGCIFg/3sT6iI0wPkeT3MKAFbjn+gEQjSAVA== X-Received: by 2002:a17:90a:266f:: with SMTP id l102mr14542976pje.190.1591977675395; Fri, 12 Jun 2020 09:01:15 -0700 (PDT) Received: from localhost ([49.205.221.68]) by smtp.gmail.com with ESMTPSA id u4sm6473576pfl.102.2020.06.12.09.01.14 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 12 Jun 2020 09:01:14 -0700 (PDT) Date: Fri, 12 Jun 2020 21:31:12 +0530 From: afzal mohammed To: Nicolas Pitre Cc: Russell King - ARM Linux admin , Arnd Bergmann , Linus Walleij , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon Subject: Re: [RFC 0/3] ARM: copy_{from,to}_user() for vmsplit 4g/4g Message-ID: <20200612160112.GA27659@afzalpc> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.3 (2018-01-21) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Fri, Jun 12, 2020 at 11:19:23AM -0400, Nicolas Pitre wrote: > On Fri, 12 Jun 2020, afzal mohammed wrote: > > Performance wise, results are not encouraging, 'dd' on tmpfs results, > Could you compare with CONFIG_UACCESS_WITH_MEMCPY as well? 512 1K 4K 16K 32K 64K 1M normal 30 46 89 95 90 85 65 uaccess_w_memcpy 28.5 45 85 92 91 85 65 w/ series 22 36 72 79 78 75 61 There are variations in the range +/-2 in some readings when repeated, not put above, to keep comparison simple. Regards afzal