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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 02A8DC43460 for ; Thu, 22 Apr 2021 12:22:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C0A4661139 for ; Thu, 22 Apr 2021 12:22:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236168AbhDVMXE (ORCPT ); Thu, 22 Apr 2021 08:23:04 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:28759 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236150AbhDVMXE (ORCPT ); Thu, 22 Apr 2021 08:23:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619094149; 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: in-reply-to:in-reply-to:references:references; bh=5a3pOBTMPgiENVQWllQZvxEn3ynunzcFc9aCy2YFqPc=; b=hLGybakcf0gmx+nXfkI5xzODRysjk1Lnx6ip3Zz+sXa1e2A8MjWoCMU4LQgVsLn98WTJiv wCRK2pf+ccwSqptj+9MqEvfeYoZabpS+AXED2fFkKNCLPg+/nQTRMIirgHhQ5MO8faeXec QZP6B2UL0SSbGlJhXCAVgDCHqldpTto= 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-321-a5abNbvdMpah-3Kgpd_yzA-1; Thu, 22 Apr 2021 08:22:20 -0400 X-MC-Unique: a5abNbvdMpah-3Kgpd_yzA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D190910C40C0; Thu, 22 Apr 2021 12:22:18 +0000 (UTC) Received: from localhost (ovpn-13-243.pek2.redhat.com [10.72.13.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id 77C3119C45; Thu, 22 Apr 2021 12:22:11 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Jeffle Xu , Mike Snitzer , dm-devel@redhat.com, Hannes Reinecke , Ming Lei Subject: [PATCH V6 08/12] block: add req flag of REQ_POLL_CTX Date: Thu, 22 Apr 2021 20:20:34 +0800 Message-Id: <20210422122038.2192933-9-ming.lei@redhat.com> In-Reply-To: <20210422122038.2192933-1-ming.lei@redhat.com> References: <20210422122038.2192933-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Add one req flag REQ_POLL_CTX which will be used in the following patch for supporting bio based IO polling. Exactly this flag can help us to do: 1) request flag is cloned in bio_fast_clone(), so if we mark one FS bio as REQ_POLL_CTX, all bios cloned from this FS bio will be marked as REQ_POLL_CTX too. 2) create per-task io polling context if the bio based queue supports polling and the submitted bio is HIPRI. Per-task io poll context will be created during submit_bio() before marking this HIPRI bio as REQ_POLL_CTX. Then we can avoid to create such io polling context if one cloned bio with REQ_POLL_CTX is submitted from another kernel context. 3) for supporting bio based io polling, we need to poll IOs from all underlying queues of the bio device, this way help us to recognize which IO needs to polled in bio based style, which will be applied in following patch. Reviewed-by: Hannes Reinecke Reviewed-by: Jeffle Xu Signed-off-by: Ming Lei --- block/blk-core.c | 7 ++++++- block/blk.h | 21 ++++++++++++++++++++- include/linux/blk_types.h | 4 ++++ 3 files changed, 30 insertions(+), 2 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 5830ef4d733e..ad57e04d5297 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -877,7 +877,12 @@ static noinline_for_stack bool submit_bio_checks(struct bio *bio) if (unlikely(!current->io_context)) create_task_io_context(current, GFP_ATOMIC, q->node); - if ((bio->bi_opf & REQ_HIPRI) && blk_queue_support_bio_poll(q)) + /* + * If REQ_POLL_CTX isn't set for this HIPRI bio, we think it + * originated from FS and allocate io polling context. + */ + if ((bio->bi_opf & REQ_HIPRI) && !(bio->bi_opf & REQ_POLL_CTX) && + blk_queue_support_bio_poll(q)) blk_create_io_poll_context(q); blk_poll_prepare(q, bio); diff --git a/block/blk.h b/block/blk.h index bc6d63ae36b7..47f60612957a 100644 --- a/block/blk.h +++ b/block/blk.h @@ -393,11 +393,30 @@ static inline struct blk_bio_poll_ctx *blk_get_bio_poll_ctx(void) static inline void blk_poll_prepare(struct request_queue *q, struct bio *bio) { + bool mq; + if (!(bio->bi_opf & REQ_HIPRI)) return; - if (!blk_queue_poll(q) || (!queue_is_mq(q) && !blk_get_bio_poll_ctx())) + /* + * Can't support bio based IO polling without per-task poll ctx + * + * We have created per-task io poll context, and mark this + * bio as REQ_POLL_CTX, so: 1) if any cloned bio from this bio is + * submitted from another kernel context, we won't create bio + * poll context for it, and that bio can be completed by IRQ; + * 2) If such bio is submitted from current context, we will + * complete it via blk_poll(); 3) If driver knows that one + * underlying bio allocated from driver is for FS bio, meantime + * it is submitted in current context, driver can mark such bio + * as REQ_HIPRI & REQ_POLL_CTX manually, so the bio can be completed + * via blk_poll too. + */ + mq = queue_is_mq(q); + if (!blk_queue_poll(q) || (!mq && !blk_get_bio_poll_ctx())) bio->bi_opf &= ~REQ_HIPRI; + else if (!mq) + bio->bi_opf |= REQ_POLL_CTX; } static inline void blk_create_io_poll_context(struct request_queue *q) diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index db026b6ec15a..99160d588c2d 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -394,6 +394,9 @@ enum req_flag_bits { __REQ_HIPRI, + /* for marking IOs originated from same FS bio in same context */ + __REQ_POLL_CTX, + /* for driver use */ __REQ_DRV, __REQ_SWAP, /* swapping request. */ @@ -418,6 +421,7 @@ enum req_flag_bits { #define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP) #define REQ_HIPRI (1ULL << __REQ_HIPRI) +#define REQ_POLL_CTX (1ULL << __REQ_POLL_CTX) #define REQ_DRV (1ULL << __REQ_DRV) #define REQ_SWAP (1ULL << __REQ_SWAP) -- 2.29.2