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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,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 78925C07E97 for ; Sat, 3 Jul 2021 10:47:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 41B6861623 for ; Sat, 3 Jul 2021 10:47:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230180AbhGCKuE (ORCPT ); Sat, 3 Jul 2021 06:50:04 -0400 Received: from out30-57.freemail.mail.aliyun.com ([115.124.30.57]:34483 "EHLO out30-57.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230114AbhGCKuD (ORCPT ); Sat, 3 Jul 2021 06:50:03 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R161e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e01424;MF=haoxu@linux.alibaba.com;NM=1;PH=DS;RN=4;SR=0;TI=SMTPD_---0UeYGk8G_1625309248; Received: from B-25KNML85-0107.local(mailfrom:haoxu@linux.alibaba.com fp:SMTPD_---0UeYGk8G_1625309248) by smtp.aliyun-inc.com(127.0.0.1); Sat, 03 Jul 2021 18:47:28 +0800 To: Pavel Begunkov Cc: Jens Axboe , io-uring , Joseph Qi From: Hao Xu Subject: Question about sendfile Message-ID: <6a7ceb04-3503-7300-8089-86c106a95e96@linux.alibaba.com> Date: Sat, 3 Jul 2021 18:47:28 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hi Pavel, I found this mail about sendfile in the maillist, may I ask why it's not good to have one pipe each for a io-wq thread. https://lore.kernel.org/io-uring/94dbbb15-4751-d03c-01fd-d25a0fe98e25@gmail.com/ Thanks, Hao