From patchwork Thu Oct 20 15:26:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Valente X-Patchwork-Id: 6257 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4242:0:0:0:0:0 with SMTP id s2csp173556wrr; Thu, 20 Oct 2022 08:28:43 -0700 (PDT) X-Google-Smtp-Source: AMsMyM7BjUoNrozwE8lvjrE9YkDp9o6O/vyCG91Nz1/G71IDFgc9/UMzaG7FaDZQ9odmTRU+861p X-Received: by 2002:a05:6402:1690:b0:45f:d702:9919 with SMTP id a16-20020a056402169000b0045fd7029919mr4290390edv.127.1666279723279; Thu, 20 Oct 2022 08:28:43 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1666279723; cv=none; d=google.com; s=arc-20160816; b=KdFSq/o2/csELCiYLV9XwoZi7LKb0jjIDzHNpor9X4xCo635VMHrVwMRGSQnd2fiuD eTHUtrquL2J4UxTYbAn7lay9E9ZGOU6haTk1HP1yOu2xoDYbPq7CJ/r4+Fkug+LNd4Kz SWAA5MoWhMMuf/htQ1rmcVG+XAAkSUsXM/u5yw3hivGa5kgzQLyH6iC8sW3DZ38DOT/0 T5EJxUqB0wsx6LceTsD5Lanm2YdX7kWq6ojiChfUCaxU0Q66WDiTaHRc9My5tVtUtTGH vQ/JjFuQrdRPGhc99uG3z6HrYKGh3ozbW7UAUzJcHbrXS6ITMncFm9VihIuIrd2uf6wv CqWQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=pOn+31mximXGw88FTtnbU7DllPEek+g8kJecNxz5KjE=; b=NW9AKIlqW+t27VqxHokuV+FdYjwuZpIQVAV+OlbKB+7WbUAXrE8+5BcvAKPgoon+mC xPQkdCjZ4g1NAQBn4U8Qz0RBTKuUBOA3NJnUVFyVCQelWgifyxFzyGbWKA9kZKH2YiMX FAixCyY3WisKNspwFC0sjq9F9XBXoiofypHtqDk55SBDlWF2bf3epY/iUSKOaCQWY69Z h5R3cexiiympOckNn03utARgGLzY60gTGk7DvzkkUVm5JF1aUpshatTLSNsCHYjH61OP /Dao0h0/yhYQRFe6AF5DUtK/BxNtLmzGZE7DkLdAHgHeoI+WBaRajg9g2KiEGrpbZjJ1 uoXQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=VusxOHdN; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id mp28-20020a1709071b1c00b0078e27f2fbe3si15558173ejc.115.2022.10.20.08.28.17; Thu, 20 Oct 2022 08:28:43 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=VusxOHdN; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230419AbiJTP1i (ORCPT + 99 others); Thu, 20 Oct 2022 11:27:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230371AbiJTP1U (ORCPT ); Thu, 20 Oct 2022 11:27:20 -0400 Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8C9D1D799B for ; Thu, 20 Oct 2022 08:27:09 -0700 (PDT) Received: by mail-wr1-x42a.google.com with SMTP id f11so35126141wrm.6 for ; Thu, 20 Oct 2022 08:27:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=pOn+31mximXGw88FTtnbU7DllPEek+g8kJecNxz5KjE=; b=VusxOHdNWislEEHmtINCCPmMwjMLjw8XBie3Jz/VU0i3TYG96wUIuiX5cdZfwXYZUJ Gaga4+Ob4vbFzUcVmOOOh8J5v/oX1AY3R64jvHWUuqZt0sD7j+AiSyfgizpbccPk22hT Z0ZuHzJUvwPLnnqs8NZ82pWulr5vF/KC/dxtSPhyjW/c2VzIlI6r6yD/Zw0U7Il2fTh/ m5OaF3rwXT2MAmaSzJDixmrng6q4t+ytzbGnljigFb6jXaO5waWy8VkJ7AqwpC8uNUsw toDhbIlmXbzPDwPjzPV6IncociHzIhH8IJiiyUjWLLcLpPe8U20HP3G+rQCilBhMJorp yUOg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=pOn+31mximXGw88FTtnbU7DllPEek+g8kJecNxz5KjE=; b=YcIv8Ve9FoWvBA6/GI0FsB0QU7oHJXCmowRr2b5Z9ZSwe8GK9lzPIuKZtNVfrIVW4E 4CYkYizerZB6ZAvCl5R6YknnRMl5fmoMBb0BxRmG8+ki702aCIB8awujin9rhw+cd8H6 mr1FNJKT/dHQcARfyb2ckChHLdYckqKu/zl1kyrPIBg1ng232hI3uZT/nB9nnVbJYumt LakVHaIZlCccxUf6c+1110DUx63VTXhJx/gD9egV3dEAGNebqSnSDwv49+zV+LldOZN3 MAIKfAv6wL62GA8F6yvtzh9kkIqoZM1zpUdlg10il1+JZ5ejzJyXY1Eqasuw6jZnHQRH 0YQw== X-Gm-Message-State: ACrzQf2LPFnoToapyOVTIIYOu/+hnq9VqZ4zwMzB+bf/AzwPbnz/uR3O OcM28owkYPI0PNfROw7K09kYlw== X-Received: by 2002:a05:6000:1e14:b0:22e:6224:1e78 with SMTP id bj20-20020a0560001e1400b0022e62241e78mr9421979wrb.56.1666279616930; Thu, 20 Oct 2022 08:26:56 -0700 (PDT) Received: from MBP-di-Paolo.station (net-2-35-55-161.cust.vodafonedsl.it. [2.35.55.161]) by smtp.gmail.com with ESMTPSA id l10-20020a1ced0a000000b003c409244bb0sm134337wmh.6.2022.10.20.08.26.55 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 20 Oct 2022 08:26:56 -0700 (PDT) From: Paolo Valente To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, glen.valante@linaro.org, arie.vanderhoeven@seagate.com, rory.c.chen@seagate.com, Paolo Valente , Damien Le Moal , Gianmarco Lusvardi , Giulio Barabino , Emiliano Maccaferri Subject: [PATCH V4 3/8] block, bfq: move io_cq-persistent bfqq data into a dedicated struct Date: Thu, 20 Oct 2022 17:26:38 +0200 Message-Id: <20221020152643.21199-4-paolo.valente@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221020152643.21199-1-paolo.valente@linaro.org> References: <20221020152643.21199-1-paolo.valente@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747220927234360820?= X-GMAIL-MSGID: =?utf-8?q?1747220927234360820?= With a multi-actuator drive, a process may get associated with multiple bfq_queues: one queue for each of the N actuators. So, the bfq_io_cq data structure must be able to accommodate its per-queue persistent information for N queues. Currently it stores this information for just one queue, in several scalar fields. This is a preparatory commit for moving to accommodating persistent information for N queues. In particular, this commit packs all the above scalar fields into a single data structure. Then there is now only one fieldi, in bfq_io_cq, that stores all the above information. This scalar field will then be turned into an array by a following commit. Suggested-by: Damien Le Moal Signed-off-by: Gianmarco Lusvardi Signed-off-by: Giulio Barabino Signed-off-by: Emiliano Maccaferri Signed-off-by: Paolo Valente --- block/bfq-iosched.c | 118 +++++++++++++++++++++++--------------------- block/bfq-iosched.h | 52 +++++++++++-------- 2 files changed, 94 insertions(+), 76 deletions(-) diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 57de6a6a7f06..d2bd94ea2e95 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -406,7 +406,7 @@ void bic_set_bfqq(struct bfq_io_cq *bic, */ bic->bfqq[is_sync][actuator_idx] = bfqq; - if (bfqq && bic->stable_merge_bfqq == bfqq) { + if (bfqq && bic->bfqq_data->stable_merge_bfqq == bfqq) { /* * Actually, these same instructions are executed also * in bfq_setup_cooperator, in case of abort or actual @@ -415,9 +415,9 @@ void bic_set_bfqq(struct bfq_io_cq *bic, * did so, we would nest even more complexity in this * function. */ - bfq_put_stable_ref(bic->stable_merge_bfqq); + bfq_put_stable_ref(bic->bfqq_data->stable_merge_bfqq); - bic->stable_merge_bfqq = NULL; + bic->bfqq_data->stable_merge_bfqq = NULL; } } @@ -1177,35 +1177,36 @@ bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, unsigned int old_wr_coeff = 1; bool busy = bfq_already_existing && bfq_bfqq_busy(bfqq); - if (bic->saved_has_short_ttime) + if (bic->bfqq_data->saved_has_short_ttime) bfq_mark_bfqq_has_short_ttime(bfqq); else bfq_clear_bfqq_has_short_ttime(bfqq); - if (bic->saved_IO_bound) + if (bic->bfqq_data->saved_IO_bound) bfq_mark_bfqq_IO_bound(bfqq); else bfq_clear_bfqq_IO_bound(bfqq); - bfqq->last_serv_time_ns = bic->saved_last_serv_time_ns; - bfqq->inject_limit = bic->saved_inject_limit; - bfqq->decrease_time_jif = bic->saved_decrease_time_jif; + bfqq->last_serv_time_ns = bic->bfqq_data->saved_last_serv_time_ns; + bfqq->inject_limit = bic->bfqq_data->saved_inject_limit; + bfqq->decrease_time_jif = bic->bfqq_data->saved_decrease_time_jif; - bfqq->entity.new_weight = bic->saved_weight; - bfqq->ttime = bic->saved_ttime; - bfqq->io_start_time = bic->saved_io_start_time; - bfqq->tot_idle_time = bic->saved_tot_idle_time; + bfqq->entity.new_weight = bic->bfqq_data->saved_weight; + bfqq->ttime = bic->bfqq_data->saved_ttime; + bfqq->io_start_time = bic->bfqq_data->saved_io_start_time; + bfqq->tot_idle_time = bic->bfqq_data->saved_tot_idle_time; /* * Restore weight coefficient only if low_latency is on */ if (bfqd->low_latency) { old_wr_coeff = bfqq->wr_coeff; - bfqq->wr_coeff = bic->saved_wr_coeff; + bfqq->wr_coeff = bic->bfqq_data->saved_wr_coeff; } - bfqq->service_from_wr = bic->saved_service_from_wr; - bfqq->wr_start_at_switch_to_srt = bic->saved_wr_start_at_switch_to_srt; - bfqq->last_wr_start_finish = bic->saved_last_wr_start_finish; - bfqq->wr_cur_max_time = bic->saved_wr_cur_max_time; + bfqq->service_from_wr = bic->bfqq_data->saved_service_from_wr; + bfqq->wr_start_at_switch_to_srt = + bic->bfqq_data->saved_wr_start_at_switch_to_srt; + bfqq->last_wr_start_finish = bic->bfqq_data->saved_last_wr_start_finish; + bfqq->wr_cur_max_time = bic->bfqq_data->saved_wr_cur_max_time; if (bfqq->wr_coeff > 1 && (bfq_bfqq_in_large_burst(bfqq) || time_is_before_jiffies(bfqq->last_wr_start_finish + @@ -1878,7 +1879,7 @@ static void bfq_bfqq_handle_idle_busy_switch(struct bfq_data *bfqd, wr_or_deserves_wr = bfqd->low_latency && (bfqq->wr_coeff > 1 || (bfq_bfqq_sync(bfqq) && - (bfqq->bic || RQ_BIC(rq)->stably_merged) && + (bfqq->bic || RQ_BIC(rq)->bfqq_data->stably_merged) && (*interactive || soft_rt))); /* @@ -2923,21 +2924,21 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, * stable merging) also if bic is associated with a * sync queue, but this bfqq is async */ - if (bfq_bfqq_sync(bfqq) && bic->stable_merge_bfqq && + if (bfq_bfqq_sync(bfqq) && bic->bfqq_data->stable_merge_bfqq && !bfq_bfqq_just_created(bfqq) && time_is_before_jiffies(bfqq->split_time + msecs_to_jiffies(bfq_late_stable_merging)) && time_is_before_jiffies(bfqq->creation_time + msecs_to_jiffies(bfq_late_stable_merging))) { struct bfq_queue *stable_merge_bfqq = - bic->stable_merge_bfqq; + bic->bfqq_data->stable_merge_bfqq; int proc_ref = min(bfqq_process_refs(bfqq), bfqq_process_refs(stable_merge_bfqq)); /* deschedule stable merge, because done or aborted here */ bfq_put_stable_ref(stable_merge_bfqq); - bic->stable_merge_bfqq = NULL; + bic->bfqq_data->stable_merge_bfqq = NULL; if (!idling_boosts_thr_without_issues(bfqd, bfqq) && proc_ref > 0) { @@ -2946,10 +2947,10 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, bfq_setup_merge(bfqq, stable_merge_bfqq); if (new_bfqq) { - bic->stably_merged = true; + bic->bfqq_data->stably_merged = true; if (new_bfqq->bic) - new_bfqq->bic->stably_merged = - true; + new_bfqq->bic->bfqq_data->stably_merged = + true; } return new_bfqq; } else @@ -3057,18 +3058,21 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq) if (!bic) return; - bic->saved_last_serv_time_ns = bfqq->last_serv_time_ns; - bic->saved_inject_limit = bfqq->inject_limit; - bic->saved_decrease_time_jif = bfqq->decrease_time_jif; - - bic->saved_weight = bfqq->entity.orig_weight; - bic->saved_ttime = bfqq->ttime; - bic->saved_has_short_ttime = bfq_bfqq_has_short_ttime(bfqq); - bic->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); - bic->saved_io_start_time = bfqq->io_start_time; - bic->saved_tot_idle_time = bfqq->tot_idle_time; - bic->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); - bic->was_in_burst_list = !hlist_unhashed(&bfqq->burst_list_node); + bic->bfqq_data->saved_last_serv_time_ns = bfqq->last_serv_time_ns; + bic->bfqq_data->saved_inject_limit = bfqq->inject_limit; + bic->bfqq_data->saved_decrease_time_jif = bfqq->decrease_time_jif; + + bic->bfqq_data->saved_weight = bfqq->entity.orig_weight; + bic->bfqq_data->saved_ttime = bfqq->ttime; + bic->bfqq_data->saved_has_short_ttime = + bfq_bfqq_has_short_ttime(bfqq); + bic->bfqq_data->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); + bic->bfqq_data->saved_io_start_time = bfqq->io_start_time; + bic->bfqq_data->saved_tot_idle_time = bfqq->tot_idle_time; + bic->bfqq_data->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); + bic->bfqq_data->was_in_burst_list = + !hlist_unhashed(&bfqq->burst_list_node); + if (unlikely(bfq_bfqq_just_created(bfqq) && !bfq_bfqq_in_large_burst(bfqq) && bfqq->bfqd->low_latency)) { @@ -3081,17 +3085,21 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq) * to bfqq, so that to avoid that bfqq unjustly fails * to enjoy weight raising if split soon. */ - bic->saved_wr_coeff = bfqq->bfqd->bfq_wr_coeff; - bic->saved_wr_start_at_switch_to_srt = bfq_smallest_from_now(); - bic->saved_wr_cur_max_time = bfq_wr_duration(bfqq->bfqd); - bic->saved_last_wr_start_finish = jiffies; + bic->bfqq_data->saved_wr_coeff = bfqq->bfqd->bfq_wr_coeff; + bic->bfqq_data->saved_wr_start_at_switch_to_srt = + bfq_smallest_from_now(); + bic->bfqq_data->saved_wr_cur_max_time = + bfq_wr_duration(bfqq->bfqd); + bic->bfqq_data->saved_last_wr_start_finish = jiffies; } else { - bic->saved_wr_coeff = bfqq->wr_coeff; - bic->saved_wr_start_at_switch_to_srt = + bic->bfqq_data->saved_wr_coeff = bfqq->wr_coeff; + bic->bfqq_data->saved_wr_start_at_switch_to_srt = bfqq->wr_start_at_switch_to_srt; - bic->saved_service_from_wr = bfqq->service_from_wr; - bic->saved_last_wr_start_finish = bfqq->last_wr_start_finish; - bic->saved_wr_cur_max_time = bfqq->wr_cur_max_time; + bic->bfqq_data->saved_service_from_wr = + bfqq->service_from_wr; + bic->bfqq_data->saved_last_wr_start_finish = + bfqq->last_wr_start_finish; + bic->bfqq_data->saved_wr_cur_max_time = bfqq->wr_cur_max_time; } } @@ -5421,8 +5429,8 @@ static void bfq_exit_icq(struct io_cq *icq) spin_lock_irqsave(&bfqd->lock, flags); for (act_idx = 0; act_idx < bfqd->num_actuators; act_idx++) { - if (bic->stable_merge_bfqq) - bfq_put_stable_ref(bic->stable_merge_bfqq); + if (bic->bfqq_data->stable_merge_bfqq) + bfq_put_stable_ref(bic->bfqq_data->stable_merge_bfqq); bfq_exit_icq_bfqq(bic, true, act_idx); bfq_exit_icq_bfqq(bic, false, act_idx); @@ -5617,8 +5625,8 @@ bfq_do_early_stable_merge(struct bfq_data *bfqd, struct bfq_queue *bfqq, return bfqq; if (new_bfqq->bic) - new_bfqq->bic->stably_merged = true; - bic->stably_merged = true; + new_bfqq->bic->bfqq_data->stably_merged = true; + bic->bfqq_data->stably_merged = true; /* * Reusing merge functions. This implies that @@ -5748,7 +5756,7 @@ static struct bfq_queue *bfq_do_or_sched_stable_merge(struct bfq_data *bfqd, /* * Record the bfqq to merge to. */ - bic->stable_merge_bfqq = last_bfqq_created; + bic->bfqq_data->stable_merge_bfqq = last_bfqq_created; } } @@ -6682,12 +6690,12 @@ static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd, bic_set_bfqq(bic, bfqq, is_sync, act_idx); if (split && is_sync) { - if ((bic->was_in_burst_list && bfqd->large_burst) || - bic->saved_in_large_burst) + if ((bic->bfqq_data->was_in_burst_list && bfqd->large_burst) || + bic->bfqq_data->saved_in_large_burst) bfq_mark_bfqq_in_large_burst(bfqq); else { bfq_clear_bfqq_in_large_burst(bfqq); - if (bic->was_in_burst_list) + if (bic->bfqq_data->was_in_burst_list) /* * If bfqq was in the current * burst list before being @@ -6802,12 +6810,12 @@ static struct bfq_queue *bfq_init_rq(struct request *rq) if (likely(!new_queue)) { /* If the queue was seeky for too long, break it apart. */ if (bfq_bfqq_coop(bfqq) && bfq_bfqq_split_coop(bfqq) && - !bic->stably_merged) { + !bic->bfqq_data->stably_merged) { struct bfq_queue *old_bfqq = bfqq; /* Update bic before losing reference to bfqq */ if (bfq_bfqq_in_large_burst(bfqq)) - bic->saved_in_large_burst = true; + bic->bfqq_data->saved_in_large_burst = true; bfqq = bfq_split_bfqq(bic, bfqq); split = true; diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h index d98e31be447f..6bc7bed97956 100644 --- a/block/bfq-iosched.h +++ b/block/bfq-iosched.h @@ -415,27 +415,9 @@ struct bfq_queue { }; /** - * struct bfq_io_cq - per (request_queue, io_context) structure. - */ -struct bfq_io_cq { - /* associated io_cq structure */ - struct io_cq icq; /* must be the first member */ - /* - * Matrix of associated process queues: first row for async - * queues, second row sync queues. Each row contains one - * column for each actuator. An I/O request generated by the - * process is inserted into the queue pointed by bfqq[i][j] if - * the request is to be served by the j-th actuator of the - * drive, where i==0 or i==1, depending on whether the request - * is async or sync. So there is a distinct queue for each - * actuator. - */ - struct bfq_queue *bfqq[2][BFQ_MAX_ACTUATORS]; - /* per (request_queue, blkcg) ioprio */ - int ioprio; -#ifdef CONFIG_BFQ_GROUP_IOSCHED - uint64_t blkcg_serial_nr; /* the current blkcg serial */ -#endif +* struct bfq_data - bfqq data unique and persistent for associated bfq_io_cq +*/ +struct bfq_iocq_bfqq_data { /* * Snapshot of the has_short_time flag before merging; taken * to remember its value while the queue is merged, so as to @@ -490,6 +472,34 @@ struct bfq_io_cq { struct bfq_queue *stable_merge_bfqq; bool stably_merged; /* non splittable if true */ +}; + +/** + * struct bfq_io_cq - per (request_queue, io_context) structure. + */ +struct bfq_io_cq { + /* associated io_cq structure */ + struct io_cq icq; /* must be the first member */ + /* + * Matrix of associated process queues: first row for async + * queues, second row sync queues. Each row contains one + * column for each actuator. An I/O request generated by the + * process is inserted into the queue pointed by bfqq[i][j] if + * the request is to be served by the j-th actuator of the + * drive, where i==0 or i==1, depending on whether the request + * is async or sync. So there is a distinct queue for each + * actuator. + */ + struct bfq_queue *bfqq[2][BFQ_MAX_ACTUATORS]; + /* per (request_queue, blkcg) ioprio */ + int ioprio; +#ifdef CONFIG_BFQ_GROUP_IOSCHED + uint64_t blkcg_serial_nr; /* the current blkcg serial */ +#endif + + /* persistent data for associated synchronous process queue */ + struct bfq_iocq_bfqq_data *bfqq_data; + unsigned int requests; /* Number of requests this process has in flight */ };