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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham 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 BAF9FC63777 for ; Tue, 24 Nov 2020 03:34:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A01B20867 for ; Tue, 24 Nov 2020 03:34:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728020AbgKXDe0 (ORCPT ); Mon, 23 Nov 2020 22:34:26 -0500 Received: from out30-133.freemail.mail.aliyun.com ([115.124.30.133]:60511 "EHLO out30-133.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725797AbgKXDeZ (ORCPT ); Mon, 23 Nov 2020 22:34:25 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R601e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04426;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0UGNUG0B_1606188832; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0UGNUG0B_1606188832) by smtp.aliyun-inc.com(127.0.0.1); Tue, 24 Nov 2020 11:33:52 +0800 From: Baolin Wang To: axboe@kernel.dk, tj@kernel.org Cc: baolin.wang@linux.alibaba.com, baolin.wang7@gmail.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 7/7] blk-iocost: Factor out the base vrate change into a separate function Date: Tue, 24 Nov 2020 11:33:36 +0800 Message-Id: X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Factor out the base vrate change code into a separate function to fimplify the ioc_timer_fn(). No functional change. Signed-off-by: Baolin Wang --- block/blk-iocost.c | 78 ++++++++++++++++++++++++++++-------------------------- 1 file changed, 41 insertions(+), 37 deletions(-) diff --git a/block/blk-iocost.c b/block/blk-iocost.c index db4f894..739c8d4 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -968,6 +968,44 @@ static void ioc_refresh_vrate(struct ioc *ioc, struct ioc_now *now) ioc->vtime_err = clamp(ioc->vtime_err, -vperiod, vperiod); } +static void ioc_refresh_base_vrate(struct ioc *ioc, u32 rq_wait_pct) +{ + u64 vrate = ioc->vtime_base_rate; + u64 vrate_min = ioc->vrate_min, vrate_max = ioc->vrate_max; + + /* rq_wait signal is always reliable, ignore user vrate_min */ + if (rq_wait_pct > RQ_WAIT_BUSY_PCT) + vrate_min = VRATE_MIN; + + /* + * If vrate is out of bounds, apply clamp gradually as the + * bounds can change abruptly. Otherwise, apply busy_level + * based adjustment. + */ + if (vrate < vrate_min) { + vrate = div64_u64(vrate * (100 + VRATE_CLAMP_ADJ_PCT), 100); + vrate = min(vrate, vrate_min); + } else if (vrate > vrate_max) { + vrate = div64_u64(vrate * (100 - VRATE_CLAMP_ADJ_PCT), 100); + vrate = max(vrate, vrate_max); + } else { + int idx = min_t(int, abs(ioc->busy_level), + ARRAY_SIZE(vrate_adj_pct) - 1); + u32 adj_pct = vrate_adj_pct[idx]; + + if (ioc->busy_level > 0) + adj_pct = 100 - adj_pct; + else + adj_pct = 100 + adj_pct; + + vrate = clamp(DIV64_U64_ROUND_UP(vrate * adj_pct, 100), + vrate_min, vrate_max); + } + + ioc->vtime_base_rate = vrate; + ioc_refresh_margins(ioc); +} + /* take a snapshot of the current [v]time and vrate */ static void ioc_now(struct ioc *ioc, struct ioc_now *now) { @@ -2320,45 +2358,11 @@ static void ioc_timer_fn(struct timer_list *timer) ioc->busy_level = clamp(ioc->busy_level, -1000, 1000); if (ioc->busy_level > 0 || (ioc->busy_level < 0 && !nr_lagging)) { - u64 vrate = ioc->vtime_base_rate; - u64 vrate_min = ioc->vrate_min, vrate_max = ioc->vrate_max; - - /* rq_wait signal is always reliable, ignore user vrate_min */ - if (rq_wait_pct > RQ_WAIT_BUSY_PCT) - vrate_min = VRATE_MIN; - - /* - * If vrate is out of bounds, apply clamp gradually as the - * bounds can change abruptly. Otherwise, apply busy_level - * based adjustment. - */ - if (vrate < vrate_min) { - vrate = div64_u64(vrate * (100 + VRATE_CLAMP_ADJ_PCT), - 100); - vrate = min(vrate, vrate_min); - } else if (vrate > vrate_max) { - vrate = div64_u64(vrate * (100 - VRATE_CLAMP_ADJ_PCT), - 100); - vrate = max(vrate, vrate_max); - } else { - int idx = min_t(int, abs(ioc->busy_level), - ARRAY_SIZE(vrate_adj_pct) - 1); - u32 adj_pct = vrate_adj_pct[idx]; - - if (ioc->busy_level > 0) - adj_pct = 100 - adj_pct; - else - adj_pct = 100 + adj_pct; + ioc_refresh_base_vrate(ioc, rq_wait_pct); - vrate = clamp(DIV64_U64_ROUND_UP(vrate * adj_pct, 100), - vrate_min, vrate_max); - } - - trace_iocost_ioc_vrate_adj(ioc, vrate, missed_ppm, rq_wait_pct, + trace_iocost_ioc_vrate_adj(ioc, ioc->vtime_base_rate, + missed_ppm, rq_wait_pct, nr_lagging, nr_shortages); - - ioc->vtime_base_rate = vrate; - ioc_refresh_margins(ioc); } else if (ioc->busy_level != prev_busy_level || nr_lagging) { trace_iocost_ioc_vrate_adj(ioc, atomic64_read(&ioc->vtime_rate), missed_ppm, rq_wait_pct, nr_lagging, -- 1.8.3.1