From patchwork Sat Dec 14 00:22:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dennis Zhou X-Patchwork-Id: 11292037 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5B24914DB for ; Sat, 14 Dec 2019 00:22:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3B3B521655 for ; Sat, 14 Dec 2019 00:22:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576282979; bh=uL/QCEIM4hlLxM2oIRuCAQEQ3clfIcpDHfacZ9ICWnI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:List-ID:From; b=Kp/hi0D36pkUWj801GUk4Ac8f13AUuJ1CLm/8HAGW5YpOtQ14qSL9cgDP1j9d+4W8 HfgOHzomgOxc3tbXA/jsgeU7kavuHMd50jeta7ola2bj/xmTdBvr5MMUNSr9kehLNy lE4UJiJ7PAmfyO0sL3MvjSoqAmqudra+SezJ+VuY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726891AbfLNAW6 (ORCPT ); Fri, 13 Dec 2019 19:22:58 -0500 Received: from mail-pj1-f65.google.com ([209.85.216.65]:39952 "EHLO mail-pj1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726869AbfLNAWz (ORCPT ); Fri, 13 Dec 2019 19:22:55 -0500 Received: by mail-pj1-f65.google.com with SMTP id s35so404987pjb.7 for ; Fri, 13 Dec 2019 16:22:54 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=TWgoePhhsYettqt4e2d29lBWc3QeiuBEz6JbZXSwAOw=; b=BY/8nTJwfZImHB+SppfjrID962w92lzT8zkuDejvRLRq2RiI7P3s6UBgbzFxpipJ4T Xh+1KjQIer34XgD+Ni21CKEeGy5o+y66McYrfeE9lDmx8LHPimM3DTb8NW0iDZFqHZf4 RZRsqoH/KVgMkk58TvRZ3aqvlexD80svHcyh2m44hpT6Qts29XKEdxEtxL70oQOKkVtr CIrn9m7NXtKuGAh6gXAJVeipmWWSgdOgLcQ5p+AaNsVgEKjxoq8IIkujRW//0WGtCPKn 6/05+ofbaMW9CPUB2Xhef9SdYwDQFsD1ocMaJDrGVgW2oAZT7/ZG9Qx+6pDhe4X3lvht seJw== X-Gm-Message-State: APjAAAX0RRBTXOE+lx+xyPGJRCBMeD0p0eZVrfLZXSH19JADgfNLLeT2 axFEy8rHNI2CsHyVHw+ZELI= X-Google-Smtp-Source: APXvYqx6Hr23gvDUAR1+PA8uoic87oInkRVuGUqVC/rWejuhM8G0iButAU1Fos2uRT5nhqGL3GxWkQ== X-Received: by 2002:a17:902:6b8a:: with SMTP id p10mr2548915plk.10.1576282974328; Fri, 13 Dec 2019 16:22:54 -0800 (PST) Received: from dennisz-mbp.thefacebook.com ([199.201.64.138]) by smtp.gmail.com with ESMTPSA id m12sm11911430pgr.87.2019.12.13.16.22.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 13 Dec 2019 16:22:53 -0800 (PST) From: Dennis Zhou To: David Sterba , Chris Mason , Josef Bacik , Omar Sandoval Cc: kernel-team@fb.com, linux-btrfs@vger.kernel.org, Dennis Zhou Subject: [PATCH 14/22] btrfs: add bps discard rate limit Date: Fri, 13 Dec 2019 16:22:23 -0800 Message-Id: <42ac06bc7e0689f5cbd1778770b7177d2562140b.1576195673.git.dennis@kernel.org> X-Mailer: git-send-email 2.13.5 In-Reply-To: References: In-Reply-To: References: Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Provide an ability to rate limit based on mbps in addition to the iops delay calculated from number of discardable extents. Signed-off-by: Dennis Zhou --- fs/btrfs/ctree.h | 2 ++ fs/btrfs/discard.c | 18 ++++++++++++++++++ fs/btrfs/sysfs.c | 31 +++++++++++++++++++++++++++++++ 3 files changed, 51 insertions(+) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 98979566e281..1b2dae5962de 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -467,10 +467,12 @@ struct btrfs_discard_ctl { spinlock_t lock; struct btrfs_block_group *block_group; struct list_head discard_list[BTRFS_NR_DISCARD_LISTS]; + u64 prev_discard; atomic_t discardable_extents; atomic64_t discardable_bytes; u32 delay; u32 iops_limit; + u64 bps_limit; }; /* delayed seq elem */ diff --git a/fs/btrfs/discard.c b/fs/btrfs/discard.c index 160713e04d0c..085f36808e7f 100644 --- a/fs/btrfs/discard.c +++ b/fs/btrfs/discard.c @@ -4,6 +4,7 @@ #include #include #include +#include #include #include #include "ctree.h" @@ -245,6 +246,19 @@ void btrfs_discard_schedule_work(struct btrfs_discard_ctl *discard_ctl, block_group = find_next_block_group(discard_ctl, now); if (block_group) { u32 delay = discard_ctl->delay; + u64 bps_limit = READ_ONCE(discard_ctl->bps_limit); + + /* + * A single delayed workqueue item is responsible for + * discarding, so we can manage the bytes rate limit by keeping + * track of the previous discard. + */ + if (bps_limit && discard_ctl->prev_discard) { + u64 bps_delay = div64_u64(discard_ctl->prev_discard * + MSEC_PER_SEC, bps_limit); + + delay = max_t(u64, delay, msecs_to_jiffies(bps_delay)); + } /* * This timeout is to hopefully prevent immediate discarding @@ -322,6 +336,8 @@ static void btrfs_discard_workfn(struct work_struct *work) btrfs_block_group_end(block_group), 0, true); + discard_ctl->prev_discard = trimmed; + /* Determine next steps for a block_group. */ if (block_group->discard_cursor >= btrfs_block_group_end(block_group)) { if (discard_state == BTRFS_DISCARD_BITMAPS) { @@ -517,10 +533,12 @@ void btrfs_discard_init(struct btrfs_fs_info *fs_info) for (i = 0; i < BTRFS_NR_DISCARD_LISTS; i++) INIT_LIST_HEAD(&discard_ctl->discard_list[i]); + discard_ctl->prev_discard = 0; atomic_set(&discard_ctl->discardable_extents, 0); atomic64_set(&discard_ctl->discardable_bytes, 0); discard_ctl->delay = BTRFS_DISCARD_MAX_DELAY; discard_ctl->iops_limit = BTRFS_DISCARD_MAX_IOPS; + discard_ctl->bps_limit = 0; } void btrfs_discard_cleanup(struct btrfs_fs_info *fs_info) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 79139b4b4f0a..12f7a906a36f 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -374,6 +374,36 @@ static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, btrfs_discard_iops_limit_store); +static ssize_t btrfs_discard_bps_limit_show(struct kobject *kobj, + struct kobj_attribute *a, + char *buf) +{ + struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); + + return snprintf(buf, PAGE_SIZE, "%llu\n", + READ_ONCE(fs_info->discard_ctl.bps_limit)); +} + +static ssize_t btrfs_discard_bps_limit_store(struct kobject *kobj, + struct kobj_attribute *a, + const char *buf, size_t len) +{ + struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); + struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; + u64 bps_limit; + int ret; + + ret = kstrtou64(buf, 10, &bps_limit); + if (ret) + return -EINVAL; + + WRITE_ONCE(discard_ctl->bps_limit, bps_limit); + + return len; +} +BTRFS_ATTR_RW(discard, bps_limit, btrfs_discard_bps_limit_show, + btrfs_discard_bps_limit_store); + static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) @@ -398,6 +428,7 @@ BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); static const struct attribute *discard_debug_attrs[] = { BTRFS_ATTR_PTR(discard, iops_limit), + BTRFS_ATTR_PTR(discard, bps_limit), BTRFS_ATTR_PTR(discard, discardable_extents), BTRFS_ATTR_PTR(discard, discardable_bytes), NULL,