Received: by 2002:ac0:a582:0:0:0:0:0 with SMTP id m2-v6csp1276771imm; Wed, 10 Oct 2018 11:54:01 -0700 (PDT) X-Google-Smtp-Source: ACcGV63BufFNYLchVTUK/nPekKnvNCDY0mAkP2uVAvx+Ub66qtp8ByyskcqPSE2HDThEjrtOkvMQ X-Received: by 2002:a17:902:b58c:: with SMTP id a12-v6mr547957pls.226.1539197641139; Wed, 10 Oct 2018 11:54:01 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1539197640; cv=none; d=google.com; s=arc-20160816; b=kQPDFCPD+w7PxwFkZwQoO4AvLZmeeZsH5jRUyKH/8dn3kDFF9tCbr3+OfU6dYPrDR9 JY0RZQV0WxqRILIOCHbSf4xnFpPzLOxHHnKUdUjZKSP3K2QNf9Zf655oNWoQSbh8tuzL QTOcHqyjdyHH9E3rxn3gWOTt84rDLemBh4wNPxll2zp/2XkdU/Jrf5ZGJs3vka7TC7jd XElbjdQo8M30+QFE1wTWd6URtVWI55BnGzEU1WJ6eXzNj8beQkKAYJZL9sLM0JuvombA hX8u2fAdPCLaSd315vT3GAY29SDyIWsa3odRQa86XSeqMSL7bMEPW/yrEsIVXSWof7lF U84w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:autocrypt:openpgp:from:references:cc:to:subject :dkim-signature; bh=bCljilA1yK+P5znT8URTGQl8nNuWcWjedEda+Wf7M8M=; b=srle91OIJ+Gwf0D+I0veASZd1gNwdrf7mizFYyWD6rk8SV0WlvHVb5YmaHOvPudebP DLPNI0GC1tS1sKC2ywXKSmeEQEGDSTMl27Lczf10pYJ425M1PSw0tfLFwS7h10MJ1TRY G9L06WcvkHPkg/JujaGiHZmrStDR/1o+5IASQs936Nc39DM8ceL2DiQXR/rOc5osub6H zkSu7LgzS+lkfGdhNCWFnEtnQQOp0m4/y4/UrmvzC1thD2O8ZbEeMrKvGYJ8HEsnoERA vxESinXQoLUCEcxq52FymOXZx/T9Wx2WgEMDGiilTx4OSNSKBEFslHNgcFwTpyu6fL+c 1lPA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=hzHZ6rID; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 31-v6si25119104pli.238.2018.10.10.11.53.45; Wed, 10 Oct 2018 11:54:00 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=hzHZ6rID; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727298AbeJKCQg (ORCPT + 99 others); Wed, 10 Oct 2018 22:16:36 -0400 Received: from mail-ed1-f67.google.com ([209.85.208.67]:43372 "EHLO mail-ed1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727044AbeJKCQg (ORCPT ); Wed, 10 Oct 2018 22:16:36 -0400 Received: by mail-ed1-f67.google.com with SMTP id y20-v6so5908011eds.10; Wed, 10 Oct 2018 11:53:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:openpgp:autocrypt:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=bCljilA1yK+P5znT8URTGQl8nNuWcWjedEda+Wf7M8M=; b=hzHZ6rIDsWzHY1iUGzeM+fky7ntzqKa69QKm2WCIENea9HYHyzaKBYlE6JN3VQNICG Jq92JTCq+URRvGdTvdSod4JonmutLcjCJLGomfmI8JPN4zuAGrTVKU8j3oCNc5lOC3eh 1qPtYQqaZSNfQMYWgsweD75Y3tXjfim9oNl23dT5vp86t/TpyijDIEqvGyPrdmq/Wa0e Tpxe+3HhOx5EIYODbaB9B9FFgjAMycEvjkdkc7nO/AAX15ArOWgzpHb83xCw2Q6DQCtU x1/1bUZG8NMGK0Osks5ZFc+TxfklAibstwTsKN2hqcieU4wItNiLgMIzGh/xLUxMxK7h CTIg== 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:openpgp:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=bCljilA1yK+P5znT8URTGQl8nNuWcWjedEda+Wf7M8M=; b=CUtBeOXLIEpnqoR1ZtWebg3z8mC9HCBNDtSIkaIPLQVXvo7T0AycKDLQ+uIzahLqIr fFK4KpZ2UnuZY9eAVxb+63E9RqCExM1y+kvgHy5qzDV8QNRWwswCSCQ13wmb31GubFSm lWwW+M43u/8aZpvfq9yLJWmGWvD6ft/9tYDBuxlw5o86MDCT+q0A99p0FnJUVpgr/jYi qmMGQyIenNev47WZjPLDAZSR2+KloWUXC6OVX956yOldmjVxY6+b+F/SAgkAZIUkJa7O qKS16d8bbEO4dn05ABnIW4xUJe7/0DozuSSjvQU1Sf9YVoQdbRtPtNhae1tNGWaA6Hzn rumQ== X-Gm-Message-State: ABuFfogIx7ESg7QoDDiOhKmjRCo5n8aobGTAmH/IJbY8SDiYefMf398C BnLsaTD6mC03Oil/w1fDQVs= X-Received: by 2002:a17:906:f186:: with SMTP id gs6-v6mr34710272ejb.212.1539197587056; Wed, 10 Oct 2018 11:53:07 -0700 (PDT) Received: from [10.67.50.38] ([192.19.223.250]) by smtp.googlemail.com with ESMTPSA id v21-v6sm1927120eja.62.2018.10.10.11.53.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 10 Oct 2018 11:53:05 -0700 (PDT) Subject: Re: [PATCH] blk: optimization for classic polling To: Nitesh Shetty , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk Cc: linux-block@vger.kernel.org, axboe@fb.com, linux-nvme@lists.infradead.org, joshi.k@samsung.com References: <3578876466-3733-1-git-send-email-nj.shetty@samsung.com> From: Florian Fainelli Openpgp: preference=signencrypt Autocrypt: addr=f.fainelli@gmail.com; prefer-encrypt=mutual; keydata= xsDiBEjPuBIRBACW9MxSJU9fvEOCTnRNqG/13rAGsj+vJqontvoDSNxRgmafP8d3nesnqPyR xGlkaOSDuu09rxuW+69Y2f1TzjFuGpBk4ysWOR85O2Nx8AJ6fYGCoeTbovrNlGT1M9obSFGQ X3IzRnWoqlfudjTO5TKoqkbOgpYqIo5n1QbEjCCwCwCg3DOH/4ug2AUUlcIT9/l3pGvoRJ0E AICDzi3l7pmC5IWn2n1mvP5247urtHFs/uusE827DDj3K8Upn2vYiOFMBhGsxAk6YKV6IP0d ZdWX6fqkJJlu9cSDvWtO1hXeHIfQIE/xcqvlRH783KrihLcsmnBqOiS6rJDO2x1eAgC8meAX SAgsrBhcgGl2Rl5gh/jkeA5ykwbxA/9u1eEuL70Qzt5APJmqVXR+kWvrqdBVPoUNy/tQ8mYc nzJJ63ng3tHhnwHXZOu8hL4nqwlYHRa9eeglXYhBqja4ZvIvCEqSmEukfivk+DlIgVoOAJbh qIWgvr3SIEuR6ayY3f5j0f2ejUMYlYYnKdiHXFlF9uXm1ELrb0YX4GMHz80nRmxvcmlhbiBG YWluZWxsaSA8Zi5mYWluZWxsaUBnbWFpbC5jb20+wmYEExECACYCGyMGCwkIBwMCBBUCCAME FgIDAQIeAQIXgAUCVF/S8QUJHlwd3wAKCRBhV5kVtWN2DvCVAJ4u4/bPF4P3jxb4qEY8I2gS 6hG0gACffNWlqJ2T4wSSn+3o7CCZNd7SLSDOw00ESM+4EhAQAL/o09boR9D3Vk1Tt7+gpYr3 WQ6hgYVON905q2ndEoA2J0dQxJNRw3snabHDDzQBAcqOvdi7YidfBVdKi0wxHhSuRBfuOppu pdXkb7zxuPQuSveCLqqZWRQ+Cc2QgF7SBqgznbe6Ngout5qXY5Dcagk9LqFNGhJQzUGHAsIs hap1f0B1PoUyUNeEInV98D8Xd/edM3mhO9nRpUXRK9Bvt4iEZUXGuVtZLT52nK6Wv2EZ1TiT OiqZlf1P+vxYLBx9eKmabPdm3yjalhY8yr1S1vL0gSA/C6W1o/TowdieF1rWN/MYHlkpyj9c Rpc281gAO0AP3V1G00YzBEdYyi0gaJbCEQnq8Vz1vDXFxHzyhgGz7umBsVKmYwZgA8DrrB0M oaP35wuGR3RJcaG30AnJpEDkBYHznI2apxdcuTPOHZyEilIRrBGzDwGtAhldzlBoBwE3Z3MY 31TOpACu1ZpNOMysZ6xiE35pWkwc0KYm4hJA5GFfmWSN6DniimW3pmdDIiw4Ifcx8b3mFrRO BbDIW13E51j9RjbO/nAaK9ndZ5LRO1B/8Fwat7bLzmsCiEXOJY7NNpIEpkoNoEUfCcZwmLrU +eOTPzaF6drw6ayewEi5yzPg3TAT6FV3oBsNg3xlwU0gPK3v6gYPX5w9+ovPZ1/qqNfOrbsE FRuiSVsZQ5s3AAMFD/9XjlnnVDh9GX/r/6hjmr4U9tEsM+VQXaVXqZuHKaSmojOLUCP/YVQo 7IiYaNssCS4FCPe4yrL4FJJfJAsbeyDykMN7wAnBcOkbZ9BPJPNCbqU6dowLOiy8AuTYQ48m vIyQ4Ijnb6GTrtxIUDQeOBNuQC/gyyx3nbL/lVlHbxr4tb6YkhkO6shjXhQh7nQb33FjGO4P WU11Nr9i/qoV8QCo12MQEo244RRA6VMud06y/E449rWZFSTwGqb0FS0seTcYNvxt8PB2izX+ HZA8SL54j479ubxhfuoTu5nXdtFYFj5Lj5x34LKPx7MpgAmj0H7SDhpFWF2FzcC1bjiW9mjW HaKaX23Awt97AqQZXegbfkJwX2Y53ufq8Np3e1542lh3/mpiGSilCsaTahEGrHK+lIusl6mz Joil+u3k01ofvJMK0ZdzGUZ/aPMZ16LofjFA+MNxWrZFrkYmiGdv+LG45zSlZyIvzSiG2lKy kuVag+IijCIom78P9jRtB1q1Q5lwZp2TLAJlz92DmFwBg1hyFzwDADjZ2nrDxKUiybXIgZp9 aU2d++ptEGCVJOfEW4qpWCCLPbOT7XBr+g/4H3qWbs3j/cDDq7LuVYIe+wchy/iXEJaQVeTC y5arMQorqTFWlEOgRA8OP47L9knl9i4xuR0euV6DChDrguup2aJVU8JPBBgRAgAPAhsMBQJU X9LxBQkeXB3fAAoJEGFXmRW1Y3YOj4UAn3nrFLPZekMeqX5aD/aq/dsbXSfyAKC45Go0YyxV HGuUuzv+GKZ6nsysJw== Message-ID: <6425d6fc-59d7-7ea0-487f-bb5d0985653c@gmail.com> Date: Wed, 10 Oct 2018 11:52:57 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <3578876466-3733-1-git-send-email-nj.shetty@samsung.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/29/2083 08:21 PM, Nitesh Shetty wrote: > This removes the dependency on interrupts to wake up task. Set task > state as TASK_RUNNING, if need_resched() returns true, > while polling for IO completion. > Earlier, polling task used to sleep, relying on interrupt to wake it up. > This made some IO take very long when interrupt-coalescing is enabled in > NVMe. > > Reference: > http://lists.infradead.org/pipermail/linux-nvme/2018-February/015435.html > Signed-off-by: Nitesh Shetty There is something seriously wrong with the date on your computer, this patch is dated from May 29th 2083,... I would not be surprised if it messed up people's email client and you did not get any response because of that... -- Florian