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=-1.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS 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 D7FE9C43381 for ; Mon, 25 Mar 2019 19:13:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A959D20854 for ; Mon, 25 Mar 2019 19:13:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="UK0EsupO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729716AbfCYTNk (ORCPT ); Mon, 25 Mar 2019 15:13:40 -0400 Received: from mail-io1-f65.google.com ([209.85.166.65]:43907 "EHLO mail-io1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729693AbfCYTNj (ORCPT ); Mon, 25 Mar 2019 15:13:39 -0400 Received: by mail-io1-f65.google.com with SMTP id x3so8608050iol.10 for ; Mon, 25 Mar 2019 12:13:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=zpomA/yvf9UXS0FI/GkXCgHhKM9Bf1K+M4jH5d25t7Q=; b=UK0EsupObmUDMpE2NSuEpGh052U0DimXPgND1a2SvSdKp4vYKfnLD+/jxiZZ+UL2I4 01J88D9QAsQMCtzQGCLsGTTsAkSdaG3pLNg63bm1gbP6lmHFDoQRinBf8E1CxgUp3T/9 Dg5Hxlcxmp/lBj5k0LYMeukfezzIoeldufq/l80/t2VtbZgpDapA6CHpoVv9x9LEB8sU RHJSW7gqtGKRHJkp/+Kuo4QBXT1+/xqjSUtKOa+Y2GDdKNwA7LiI0lJFKEsHnLpTGGSd VPXKq0HXV22ifqpn9YLlt0QR9kNziDcs/4UWPswovpgxaf4d7+nh2fXnyJDhptay17Ee b/Ig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=zpomA/yvf9UXS0FI/GkXCgHhKM9Bf1K+M4jH5d25t7Q=; b=paThNHV2J2buGw8FM5X+NiN8c6v48MVHZJIXRlrY5ps7Y/2hfyz5eIMagMI7zzyG3I PUAi5EN/HVYgZwpI86wsBUMZDqsPiGViarBk5+X7gcLALeUMNVNDn02fXc1VhSO9Dafq J2w8yHdQ1cHbjofC1JFaWqmYJxjKBsU5GSev61tT0wBKZfd8R0EFyL8clTjYt8X+S0mS 4HBha3swPiSFuEBF+9YnCnhX4MrH1F2b0A9h+uu3LRkIjPbP7cBqBVFfTFL4+y8V98e3 d2wKMfEOvVEOrf8R4uTAOTdqC+LILHL5VFEJhg4QBdX11rlxfI2dNWWr+B1LZ1S3bhVP xz0A== X-Gm-Message-State: APjAAAVJ9wS5ih7c8UJXsEsF5A3hlIwFS3aKmtPsaMs0qKIs7srBjG9A /pj9Lin0i4VLBELUMgNBkCs25KND2akqFQ== X-Google-Smtp-Source: APXvYqzecGiVC9aoDswa/P/Ph0IlnrjXo3GpWqH7dk50vgphHaVXSkUFKHbs+Nm2rtLWwG3bolFr5g== X-Received: by 2002:a5e:d616:: with SMTP id w22mr17999152iom.118.1553541217246; Mon, 25 Mar 2019 12:13:37 -0700 (PDT) Received: from [192.168.1.158] ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id 139sm6305124itk.28.2019.03.25.12.13.35 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 25 Mar 2019 12:13:36 -0700 (PDT) Subject: Re: [PATCH 1/1] io_uring: offload write to async worker in case of -EAGAIN To: Roman Penyaev Cc: linux-block@vger.kernel.org References: <20190325190924.11174-1-rpenyaev@suse.de> From: Jens Axboe Message-ID: Date: Mon, 25 Mar 2019 13:13:35 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: <20190325190924.11174-1-rpenyaev@suse.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 3/25/19 1:09 PM, Roman Penyaev wrote: > In case of direct write -EAGAIN will be returned if page cache was > previously populated. To avoid immediate completion of a request > with -EAGAIN error write has to be offloaded to the async worker, > like io_read() does. Thanks, applied. -- Jens Axboe