From patchwork Sat Dec 14 00:22:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dennis Zhou X-Patchwork-Id: 11292045 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 51210930 for ; Sat, 14 Dec 2019 00:23:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3107C21655 for ; Sat, 14 Dec 2019 00:23:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576282982; bh=5CCRN0XKL3hwL3h3Vb2X06MMFHSuTzQoC4/rFTIK5LA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:List-ID:From; b=UgBPpNUGvO7GDm4Ggge9nIZcJCeBaXVMnSYVO2UvZvAEoH4EXIhO2EGuA8xVWsXPT zvh4KrGtls3ul6BhBTzsxhrTm+c8dKo4huNRQ37WBSqxha7V32IqF+8TYxRAUgrM3V sfQvvhEFjlKyZbzbiu7JRaEhuWUyK/eWckeYDrLI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726916AbfLNAXB (ORCPT ); Fri, 13 Dec 2019 19:23:01 -0500 Received: from mail-pf1-f193.google.com ([209.85.210.193]:44581 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726865AbfLNAXA (ORCPT ); Fri, 13 Dec 2019 19:23:00 -0500 Received: by mail-pf1-f193.google.com with SMTP id d199so2309098pfd.11 for ; Fri, 13 Dec 2019 16:23:00 -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=bv31FZZtdoHSEEM8ivvhGyb/leVvkzaUrJCoVFvSITE=; b=qQI33Dt4rs0jAN0k78wMs30Vd2HSl/jnSTwgmzoONkS+Mm1gkxP70KBr1q1kRtJka/ tZAcEcD70P7j40l4Vs14DD0ExvhjGf3hmyzB6brH3zcNMV6wOEdfvyqryPsIRnu86E0z sA/uZVQrFeGh1a2Yu2wS+RYm71hI9dQW/YNSFCsfOALXkZL1RGm9ou7Ej8hCa3Tj/vHc RCJx+q9bjbqwdYIrdVKrD5bEIiePh3uBuduQ9pd8dfz8kjpfAK2mh7QOYNusSwmDKHtm l4ktR3RriwqgW1MgC/35O54zb60yjWOlIWKMc4c4QRiQIRm+b/YjiI1gYQlMqYSWdI76 i1MA== X-Gm-Message-State: APjAAAVuORTAUFyYOFogCiAncEIBbKpZx7w79zieVeLg51KKo6sM1OTV K5N1x2LjiWu2P1SVVcvq2BY= X-Google-Smtp-Source: APXvYqy7GvSn5qvooT7P++CxuyWjoDTaLR853EAvtuXnKnWr195mfcFrVmoiiXTm8FRanAQZPFNF9A== X-Received: by 2002:aa7:951c:: with SMTP id b28mr2487664pfp.97.1576282979972; Fri, 13 Dec 2019 16:22:59 -0800 (PST) Received: from dennisz-mbp.thefacebook.com ([199.201.64.138]) by smtp.gmail.com with ESMTPSA id m12sm11911430pgr.87.2019.12.13.16.22.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 13 Dec 2019 16:22:59 -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 19/22] btrfs: keep track of discard reuse stats Date: Fri, 13 Dec 2019 16:22:28 -0800 Message-Id: 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 Keep track of how much we are discarding and how often we are reusing with async discard. Signed-off-by: Dennis Zhou Reviewed-by: Josef Bacik --- fs/btrfs/ctree.h | 3 +++ fs/btrfs/discard.c | 7 +++++++ fs/btrfs/free-space-cache.c | 14 ++++++++++++++ fs/btrfs/sysfs.c | 36 ++++++++++++++++++++++++++++++++++++ 4 files changed, 60 insertions(+) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index dddf51e27bed..edfbe6060e8d 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -474,6 +474,9 @@ struct btrfs_discard_ctl { u32 delay; u32 iops_limit; u64 bps_limit; + u64 discard_extent_bytes; + u64 discard_bitmap_bytes; + atomic64_t discard_bytes_saved; }; /* delayed seq elem */ diff --git a/fs/btrfs/discard.c b/fs/btrfs/discard.c index 55ad357e65f3..fe73814526ef 100644 --- a/fs/btrfs/discard.c +++ b/fs/btrfs/discard.c @@ -419,11 +419,15 @@ static void btrfs_discard_workfn(struct work_struct *work) block_group->discard_cursor, btrfs_block_group_end(block_group), minlen, maxlen, true); + WRITE_ONCE(discard_ctl->discard_bitmap_bytes, + discard_ctl->discard_bitmap_bytes + trimmed); } else { btrfs_trim_block_group_extents(block_group, &trimmed, block_group->discard_cursor, btrfs_block_group_end(block_group), minlen, true); + WRITE_ONCE(discard_ctl->discard_extent_bytes, + discard_ctl->discard_extent_bytes + trimmed); } discard_ctl->prev_discard = trimmed; @@ -631,6 +635,9 @@ void btrfs_discard_init(struct btrfs_fs_info *fs_info) discard_ctl->delay = BTRFS_DISCARD_MAX_DELAY; discard_ctl->iops_limit = BTRFS_DISCARD_MAX_IOPS; discard_ctl->bps_limit = 0; + discard_ctl->discard_extent_bytes = 0; + discard_ctl->discard_bitmap_bytes = 0; + atomic64_set(&discard_ctl->discard_bytes_saved, 0); } void btrfs_discard_cleanup(struct btrfs_fs_info *fs_info) diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index c9bf0207960d..612726a91e98 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -2844,6 +2844,8 @@ u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group, u64 *max_extent_size) { struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; + struct btrfs_discard_ctl *discard_ctl = + &block_group->fs_info->discard_ctl; struct btrfs_free_space *entry = NULL; u64 bytes_search = bytes + empty_size; u64 ret = 0; @@ -2860,6 +2862,10 @@ u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group, ret = offset; if (entry->bitmap) { bitmap_clear_bits(ctl, entry, offset, bytes); + + if (!btrfs_free_space_trimmed(entry)) + atomic64_add(bytes, &discard_ctl->discard_bytes_saved); + if (!entry->bytes) free_bitmap(ctl, entry); } else { @@ -2868,6 +2874,9 @@ u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group, align_gap = entry->offset; align_gap_trim_state = entry->trim_state; + if (!btrfs_free_space_trimmed(entry)) + atomic64_add(bytes, &discard_ctl->discard_bytes_saved); + entry->offset = offset + bytes; WARN_ON(entry->bytes < bytes + align_gap_len); @@ -2972,6 +2981,8 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group, u64 min_start, u64 *max_extent_size) { struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; + struct btrfs_discard_ctl *discard_ctl = + &block_group->fs_info->discard_ctl; struct btrfs_free_space *entry = NULL; struct rb_node *node; u64 ret = 0; @@ -3036,6 +3047,9 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group, spin_lock(&ctl->tree_lock); + if (!btrfs_free_space_trimmed(entry)) + atomic64_add(bytes, &discard_ctl->discard_bytes_saved); + ctl->free_space -= bytes; if (!entry->bitmap && !btrfs_free_space_trimmed(entry)) ctl->discardable_bytes[BTRFS_STAT_CURR] -= bytes; diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index e71e8bbc57d0..613606389072 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -456,12 +456,48 @@ static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, } BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); +static ssize_t btrfs_discard_extent_bytes_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, "%lld\n", + READ_ONCE(fs_info->discard_ctl.discard_extent_bytes)); +} +BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); + +static ssize_t btrfs_discard_bitmap_bytes_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, "%lld\n", + READ_ONCE(fs_info->discard_ctl.discard_bitmap_bytes)); +} +BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); + +static ssize_t btrfs_discard_bytes_saved_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, "%lld\n", + atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); +} +BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); + static const struct attribute *discard_debug_attrs[] = { BTRFS_ATTR_PTR(discard, iops_limit), BTRFS_ATTR_PTR(discard, bps_limit), BTRFS_ATTR_PTR(discard, max_discard_size), BTRFS_ATTR_PTR(discard, discardable_extents), BTRFS_ATTR_PTR(discard, discardable_bytes), + BTRFS_ATTR_PTR(discard, discard_extent_bytes), + BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), + BTRFS_ATTR_PTR(discard, discard_bytes_saved), NULL, };