From patchwork Mon May 23 08:26:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 12858573 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 E7DB9C433FE for ; Mon, 23 May 2022 08:13:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231576AbiEWINI (ORCPT ); Mon, 23 May 2022 04:13:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231487AbiEWINE (ORCPT ); Mon, 23 May 2022 04:13:04 -0400 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6A4E5586; Mon, 23 May 2022 01:13:01 -0700 (PDT) Received: from kwepemi100003.china.huawei.com (unknown [172.30.72.54]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4L697F59wJzDqNj; Mon, 23 May 2022 16:12:57 +0800 (CST) Received: from kwepemm600009.china.huawei.com (7.193.23.164) by kwepemi100003.china.huawei.com (7.221.188.122) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 23 May 2022 16:12:59 +0800 Received: from huawei.com (10.175.127.227) by kwepemm600009.china.huawei.com (7.193.23.164) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 23 May 2022 16:12:58 +0800 From: Yu Kuai To: , , , CC: , , , , Subject: [PATCH -next v4 3/4] blk-throttle: factor out code to calculate ios/bytes_allowed Date: Mon, 23 May 2022 16:26:32 +0800 Message-ID: <20220523082633.2324980-4-yukuai3@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220523082633.2324980-1-yukuai3@huawei.com> References: <20220523082633.2324980-1-yukuai3@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.127.227] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemm600009.china.huawei.com (7.193.23.164) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org No functional changes, new apis will be used in later patches to handle throttled bios while updating config. Signed-off-by: Yu Kuai --- block/blk-throttle.c | 48 +++++++++++++++++++++++++++----------------- 1 file changed, 30 insertions(+), 18 deletions(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 7e0c31e920dd..ded0d30ef49e 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -754,25 +754,12 @@ static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw) tg->slice_start[rw], tg->slice_end[rw], jiffies); } -static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio, - u32 iops_limit, unsigned long *wait) +static unsigned int calculate_io_allowed(u32 iops_limit, + unsigned long jiffy_elapsed_rnd) { - bool rw = bio_data_dir(bio); unsigned int io_allowed; - unsigned long jiffy_elapsed, jiffy_wait, jiffy_elapsed_rnd; u64 tmp; - if (iops_limit == UINT_MAX) { - if (wait) - *wait = 0; - return true; - } - - jiffy_elapsed = jiffies - tg->slice_start[rw]; - - /* Round up to the next throttle slice, wait time must be nonzero */ - jiffy_elapsed_rnd = roundup(jiffy_elapsed + 1, tg->td->throtl_slice); - /* * jiffy_elapsed_rnd should not be a big value as minimum iops can be * 1 then at max jiffy elapsed should be equivalent of 1 second as we @@ -788,6 +775,33 @@ static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio, else io_allowed = tmp; + return io_allowed; +} + +static u64 calculate_bytes_allowed(u64 bps_limit, + unsigned long jiffy_elapsed_rnd) +{ + return mul_u64_u64_div_u64(bps_limit, (u64)jiffy_elapsed_rnd, (u64)HZ); +} + +static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio, + u32 iops_limit, unsigned long *wait) +{ + bool rw = bio_data_dir(bio); + unsigned int io_allowed; + unsigned long jiffy_elapsed, jiffy_wait, jiffy_elapsed_rnd; + + if (iops_limit == UINT_MAX) { + if (wait) + *wait = 0; + return true; + } + + jiffy_elapsed = jiffies - tg->slice_start[rw]; + + /* Round up to the next throttle slice, wait time must be nonzero */ + jiffy_elapsed_rnd = roundup(jiffy_elapsed + 1, tg->td->throtl_slice); + io_allowed = calculate_io_allowed(iops_limit, jiffy_elapsed_rnd); if (tg->io_disp[rw] + 1 <= io_allowed) { if (wait) *wait = 0; @@ -824,9 +838,7 @@ static bool tg_with_in_bps_limit(struct throtl_grp *tg, struct bio *bio, jiffy_elapsed_rnd = tg->td->throtl_slice; jiffy_elapsed_rnd = roundup(jiffy_elapsed_rnd, tg->td->throtl_slice); - bytes_allowed = mul_u64_u64_div_u64(bps_limit, (u64)jiffy_elapsed_rnd, - (u64)HZ); - + bytes_allowed = calculate_bytes_allowed(bps_limit, jiffy_elapsed_rnd); if (tg->bytes_disp[rw] + bio_size <= bytes_allowed) { if (wait) *wait = 0;