From nobody Tue Apr 7 08:11:04 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A85EFC43219 for ; Thu, 13 Oct 2022 14:04:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230155AbiJMOEg (ORCPT ); Thu, 13 Oct 2022 10:04:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229920AbiJMOE3 (ORCPT ); Thu, 13 Oct 2022 10:04:29 -0400 Received: from mail-oa1-x2b.google.com (mail-oa1-x2b.google.com [IPv6:2001:4860:4864:20::2b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 204D64C032; Thu, 13 Oct 2022 07:04:14 -0700 (PDT) Received: by mail-oa1-x2b.google.com with SMTP id 586e51a60fabf-1364357a691so2383861fac.7; Thu, 13 Oct 2022 07:04:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=P3lzffeHmbexWVtKhrHG9c286PrH8ea4fn4/VFTKtUI=; b=pyTFtbpqkize8kW1Owf9hUAM5zNNJzYmp5MHcfKlmD519xwRmXSE4n8iqx4pQ9Th+f EcsrFVvUa4cZWU89Ca8lSQHMhQ7o+HX8RwhyKWpeyint//6sEXm3SUKO/6Hdp2VanFsd jTkd+EdzA02ULjiIdWxm/w/VfU8FsvHQ/LrjEXJJGHBAURWxBKE4brKJrqOAu6fAcO0a 77THxw6s65Vxah9u6PS2SSm/RhAQMG+tUw+QrerMVy9linXduPhEqu4Mig147SMxMIy8 Q6RrjJN7+bkstFgaRmV1oCSfE4ws23vpFUikNLbok6MHVe4PpKHEGzwWlZgFJeIIgHMi VcZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=P3lzffeHmbexWVtKhrHG9c286PrH8ea4fn4/VFTKtUI=; b=Ekft9pK3bnXqNEG1l7o07LCkv+tjyTs8zu5olIGSDrhp6cNOwl3BwJMMPUgeGRV3gJ LLj6aaJ4JxNI+9FTS7u5KNz++yFPhSt1Zk1wSrWUf+g0zfbki/3/vN4nkWgAypdHKpVF EdopC0VcedtGyce8Hrsu6wjwoe7CLdxrNAV81xCFEP8cBic7AM+wqNwBgS46pn05RXu8 Puam2ZjGVD1MBPqx/RdtZcvS+mRqh0sxkiYHz4kfLFhoXrniCz9eJSCvF7dG/Flldtye uCcBvufrnr/L6eYW3mptJzZqPYd/ZC1sdz0kpgpqr0KzgA2WzYgRMrbmRcTKfYrEateP Ssvw== X-Gm-Message-State: ACrzQf1f94kjgAboXzT37PBKkb3ZymxNRs2alhVGA0jh6TpfbhQpmFUD ch3CYUV5Y0bzeDhNlY5zb2kxThpKaTSSKVzMlaM= X-Google-Smtp-Source: AMsMyM7WNtzh048Cixz7xAMEuZLEvsqFShLD207m5i7JKfrcDOHZ+w8jM7YOCo9WKrnANABbqtLaBQ== X-Received: by 2002:a17:90b:1c0e:b0:20d:8cc5:23e5 with SMTP id oc14-20020a17090b1c0e00b0020d8cc523e5mr9849752pjb.111.1665669252648; Thu, 13 Oct 2022 06:54:12 -0700 (PDT) Received: from Zbook.localdomain ([129.227.152.6]) by smtp.gmail.com with ESMTPSA id s15-20020a170902ea0f00b0016d72804664sm12650457plg.205.2022.10.13.06.54.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Oct 2022 06:54:12 -0700 (PDT) From: Yuwei Guan X-Google-Original-From: Yuwei Guan To: paolo.valente@linaro.org, axboe@kernel.dk, jack@suse.cz Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Yuwei.Guan@zeekrlife.com Subject: [PATCH] bfq: do try insert merge before bfq_init_rq() call Date: Thu, 13 Oct 2022 21:53:21 +0800 Message-Id: <20221013135321.174-1-Yuwei.Guan@zeekrlife.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" It's useless to do bfq_init_rq(rq), if the rq can do merge first. In the patch 5f550ede5edf8, it moved to bfq_init_rq() before blk_mq_sched_try_insert_merge(), but it's pointless, as the fifo_time of next is not set yet, and !list_empty(&next->queuelist) is 0, so it does not need to reposition rq's fifo_time. And for the "hash lookup, try again" situation, as follow, bfq_requests_merged() call can work normally. blk_mq_sched_try_insert_merge elv_attempt_insert_merge elv_rqhash_find Signed-off-by: Yuwei Guan --- block/bfq-iosched.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 7ea427817f7f..9845370a701c 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -6147,7 +6147,7 @@ static void bfq_insert_request(struct blk_mq_hw_ctx *= hctx, struct request *rq, bfqg_stats_update_legacy_io(q, rq); #endif spin_lock_irq(&bfqd->lock); - bfqq =3D bfq_init_rq(rq); + if (blk_mq_sched_try_insert_merge(q, rq, &free)) { spin_unlock_irq(&bfqd->lock); blk_mq_free_requests(&free); @@ -6156,6 +6156,7 @@ static void bfq_insert_request(struct blk_mq_hw_ctx *= hctx, struct request *rq, =20 trace_block_rq_insert(rq); =20 + bfqq =3D bfq_init_rq(rq); if (!bfqq || at_head) { if (at_head) list_add(&rq->queuelist, &bfqd->dispatch); --=20 2.34.1