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=-2.9 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_GIT autolearn=ham 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 DF43FC46464 for ; Thu, 9 Aug 2018 09:33:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8F35221CD2 for ; Thu, 9 Aug 2018 09:33:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="sxr2Cm28" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8F35221CD2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=sai.msu.ru Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730459AbeHIL5b (ORCPT ); Thu, 9 Aug 2018 07:57:31 -0400 Received: from mail-lj1-f195.google.com ([209.85.208.195]:41697 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727579AbeHIL5b (ORCPT ); Thu, 9 Aug 2018 07:57:31 -0400 Received: by mail-lj1-f195.google.com with SMTP id y17-v6so3946868ljy.8; Thu, 09 Aug 2018 02:33:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id; bh=JzI8wTZ+ADBvRRSu5Qnoau2q0SRcjd7XrpaY+dkyeBE=; b=sxr2Cm28mzr3T+73Qjjxg5OnbV2ZyZhGMEupqvpBDqovcbjV4UVgGd+uCMq7GQHA/3 Ec/BEbAR23NVRUzQfJSfB4L2Ar726UuaG0uk8pnNxU0+AxdfcOuRGL28++3CwcM6TpkU Dd/BdCBZ1P4hXxqvVfIu0IexeQvjKTk1M6x9bjBpGgSUZ5AJg9TVLEYzwtfct6SSAYSo dDPl6qVQmHa/2+7yu43Qtsye/PGLhoOgsH1rBfYeOw4CGxX+i9Zha0S/AKDeKb4K+AQh SB49WdpFuOEdfD3ypZJOL8tX64RN904UYc6BMoszRvbzpj/PIdPz5iZoobj5+OGgZLTC ixYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id; bh=JzI8wTZ+ADBvRRSu5Qnoau2q0SRcjd7XrpaY+dkyeBE=; b=GuDYlBd9j5eqKUptUkdcK2UnEx7eOw8N01Wi7u9y/VoIv7+qsyj1GYiMFlTjZ3EkSk 2ZPa9PrgWmvDIVZ2jnHqZgtMfDURfrtOK2SFwIrpcECVmE8CH4OxHDVWNkXuH8Z39DGa +KdvyXCGvqf8uaa/JO8i3ZzthdJU9a4axgbnuQVECFKYMT6BADvoro+5EjW/VZ98GBFZ DBmfD5TCLulUDdBYhoub4kR0h4GujlB+jwDz/1F67icgFaF+RXVjs9XcdMhX7gWNCBY1 /xBQ5gLws0AFkvbrukXcYW2K8d6JySSRaw3FTi2Hq4PRZYmFEQ3EFGaIbppXJYZCErn2 5KBg== X-Gm-Message-State: AOUpUlG4+92kAn2fZg92FbdBnxPh4WHJd6X+kq7Ac5H82RCQnv03vdq2 iv+UNCnEQH7ggmkmqyazfsfZqQMOPSc= X-Google-Smtp-Source: AA+uWPzb0AjAiXM0rKP+OG4wu7Wob1yePqDjuOM+ADzWFRGZ+U0de/f5ADkXG+KKn8Hma6SPShbi7A== X-Received: by 2002:a2e:5243:: with SMTP id g64-v6mr1093565ljb.144.1533807208878; Thu, 09 Aug 2018 02:33:28 -0700 (PDT) Received: from alpha.sai.msu.ru ([93.180.21.1]) by smtp.gmail.com with ESMTPSA id q15-v6sm1070721ljg.62.2018.08.09.02.33.27 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 09 Aug 2018 02:33:28 -0700 (PDT) From: "Matwey V. Kornilov" To: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "Matwey V. Kornilov" , tfiga@chromium.org, laurent.pinchart@ideasonboard.com, matwey@sai.msu.ru, stern@rowland.harvard.edu, ezequiel@collabora.com, hdegoede@redhat.com, hverkuil@xs4all.nl, mchehab@kernel.org, rostedt@goodmis.org, mingo@redhat.com, isely@pobox.com, bhumirks@gmail.com, colin.king@canonical.com, kieran.bingham@ideasonboard.com, keiichiw@chromium.org Subject: [PATCH v3 0/2] media: usb: pwc: Don't use coherent DMA buffers for ISO transfer Date: Thu, 9 Aug 2018 12:33:05 +0300 Message-Id: <20180809093307.6001-1-matwey@sai.msu.ru> X-Mailer: git-send-email 2.16.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Matwey V. Kornilov" DMA cocherency slows the transfer down on systems without hardware coherent DMA. In order to demontrate this we introduce performance measurement facilities in patch 1 and fix the performance issue in patch 2 in order to obtain 4 times speedup. Changes since v2: * use dma_sync_single_for_cpu() to achive better performance * remeasured performance Changes since v1: * trace_pwc_handler_exit() call moved to proper place * detailed description added for commit 1 * additional output added to trace to track separate frames Matwey V. Kornilov (2): media: usb: pwc: Introduce TRACE_EVENTs for pwc_isoc_handler() media: usb: pwc: Don't use coherent DMA buffers for ISO transfer drivers/media/usb/pwc/pwc-if.c | 54 +++++++++++++++++++++++++++-------- include/trace/events/pwc.h | 64 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 106 insertions(+), 12 deletions(-) create mode 100644 include/trace/events/pwc.h -- 2.16.4