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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 83484C35242 for ; Tue, 11 Feb 2020 19:17:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5FCFB2465D for ; Tue, 11 Feb 2020 19:17:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730459AbgBKTRx (ORCPT ); Tue, 11 Feb 2020 14:17:53 -0500 Received: from mga17.intel.com ([192.55.52.151]:40289 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731496AbgBKTRx (ORCPT ); Tue, 11 Feb 2020 14:17:53 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Feb 2020 11:17:53 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,428,1574150400"; d="scan'208";a="266372296" Received: from unknown (HELO localhost.localdomain) ([10.232.115.123]) by fmsmga002.fm.intel.com with ESMTP; 11 Feb 2020 11:17:52 -0800 From: Andrzej Jakowski To: axboe@kernel.dk, song@kernel.org Cc: linux-block@vger.kernel.org, linux-raid@vger.kernel.org, Andrzej Jakowski Subject: [PATCH v2 0/2] Enable polling on stackable devices Date: Tue, 11 Feb 2020 12:17:27 -0700 Message-Id: <20200211191729.4745-1-andrzej.jakowski@linux.intel.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Changes since v1: - reintroduced original blk_poll() function that has been removed some time ago (Jens) - added fastpath calls to blk_mq_poll() in blk_poll() (Christoph, Jens) - incorporated code style fixes into md patch (Christoph) [1]: https://lore.kernel.org/linux-block/20200126044138.5066-1-andrzej.jakowski@linux.intel.com/T/#t --- IO polling is available on blk-mq devices. It is not possible to perform IO polling on stackable devices like MD. In this patch series we propose to reintroduce blk_poll() function. blk_poll() when called on stackable block device that supports polling will invoke its polling handler. Otherwise it will call blk_mq_poll() directly for fast accesses. This patch set also includes example implemetation of polling on MD RAID-0 volume. --- TODO: - introduce REQ_NOWAIT support for stackable devices in a separate patchset (Christoph) Andrzej Jakowski (1): block: reintroduce polling on bio level Artur Paszkiewicz (1): md: enable io polling block/blk-core.c | 28 ++++++++++++++++++++++++++++ block/blk-mq.c | 23 ++--------------------- block/blk-mq.h | 2 ++ drivers/md/md.c | 40 ++++++++++++++++++++++++++++++++++++---- include/linux/blkdev.h | 2 ++ 5 files changed, 70 insertions(+), 25 deletions(-) -- 2.20.1