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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 E1825C33CB7 for ; Sun, 19 Jan 2020 07:14:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B7BFE2072B for ; Sun, 19 Jan 2020 07:14:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="XgrZw3G7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726396AbgASHO5 (ORCPT ); Sun, 19 Jan 2020 02:14:57 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:56254 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726421AbgASHO4 (ORCPT ); Sun, 19 Jan 2020 02:14:56 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579418095; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=SkLv9GpBnorVKrQ47OoiNoTgmTgTfdJV990vGs9ooys=; b=XgrZw3G77/bL6KMTouNLW9wHbwOWfobkKX07yAdW4hN0XZNmnutLEkgi8XJDyXDzkMHoa7 ChMw26ELf8sI2xehOq/Q6lto2sMxNOGKsqFVk8R6Xu1CwDF+36zbK0LuG131GQXmubFmOw b1cASwX4nohbVYjWGNgV5Zwc2vROfZg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-438-l6-29xjfNHiSHkx3dOzN3g-1; Sun, 19 Jan 2020 02:14:51 -0500 X-MC-Unique: l6-29xjfNHiSHkx3dOzN3g-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5CBDE800D4E; Sun, 19 Jan 2020 07:14:49 +0000 (UTC) Received: from localhost (ovpn-8-23.pek2.redhat.com [10.72.8.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id BDD545C1D4; Sun, 19 Jan 2020 07:14:45 +0000 (UTC) From: Ming Lei To: James Bottomley , linux-scsi@vger.kernel.org, "Martin K . Petersen" Cc: linux-block@vger.kernel.org, Jens Axboe , Ming Lei , Sathya Prakash , Chaitra P B , Suganath Prabu Subramani , Kashyap Desai , Sumit Saxena , Shivasharan S , "Ewan D . Milne" , Hannes Reinecke , Bart Van Assche Subject: [PATCH 0/6] scsi: support bypass device busy check for some high end HBA with SSD Date: Sun, 19 Jan 2020 15:14:26 +0800 Message-Id: <20200119071432.18558-1-ming.lei@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Content-Transfer-Encoding: quoted-printable Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hi, SCSI's per-LUN queue depth is usually for improving IO merge and balancing IO load among LUNs. blk-mq has provides fair driver tag allocation and managed IRQ balances interrupt load among queues, meantime IO merge doesn't play a big role for SSD, and NVMe doesn't apply per-namespace queue depth. This patchset tries to don't apply per-LUN queue depth for some high end HBA in case of SSD, then we can avoid the expensive atomic operation on sdev->device_busy. We do understand that this shared counter affects IOPS a lot. Thanks, Ming Ming Lei (6): scsi: mpt3sas: don't use .device_busy in device reset routine scsi: remove .for_blk_mq scsi: sd: register request queue after sd_revalidate_disk is done block: freeze queue for updating QUEUE_FLAG_NONROT scsi: core: don't limit per-LUN queue depth for SSD when HBA needs scsi: megaraid: set flag of no_device_queue_for_ssd block/blk-sysfs.c | 14 +++++++++- drivers/scsi/megaraid/megaraid_sas_base.c | 1 + drivers/scsi/mpt3sas/mpt3sas_scsih.c | 32 ++++++++++++++++++++- drivers/scsi/scsi_lib.c | 34 +++++++++++++++++++---- drivers/scsi/sd.c | 7 ++++- drivers/scsi/virtio_scsi.c | 1 - include/scsi/scsi_host.h | 4 +-- 7 files changed, 81 insertions(+), 12 deletions(-) Cc: Sathya Prakash Cc: Chaitra P B Cc: Suganath Prabu Subramani Cc: Kashyap Desai Cc: Sumit Saxena Cc: Shivasharan S Cc: Ewan D. Milne Cc: Hannes Reinecke Cc: Bart Van Assche --=20 2.20.1