From patchwork Thu Apr 26 09:17:20 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 10365101 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 9BE8460225 for ; Thu, 26 Apr 2018 09:17:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8CB4528FD5 for ; Thu, 26 Apr 2018 09:17:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 818E228FFD; Thu, 26 Apr 2018 09:17:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DE58D28FD5 for ; Thu, 26 Apr 2018 09:17:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754086AbeDZJRa (ORCPT ); Thu, 26 Apr 2018 05:17:30 -0400 Received: from victor.provo.novell.com ([137.65.250.26]:39212 "EHLO prv3-mh.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753256AbeDZJR1 (ORCPT ); Thu, 26 Apr 2018 05:17:27 -0400 Received: from adam-pc.lan (prv-ext-foundry1int.gns.novell.com [137.65.251.240]) by prv3-mh.provo.novell.com with ESMTP (NOT encrypted); Thu, 26 Apr 2018 03:17:23 -0600 From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH] btrfs: trace: Add trace points for unused block groups Date: Thu, 26 Apr 2018 17:17:20 +0800 Message-Id: <20180426091720.24185-1-wqu@suse.com> X-Mailer: git-send-email 2.17.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch will add the following trace events: 1) btrfs_remove_block_group For btrfs_remove_block_group() function. Triggered when a block group is really removed. 2) btrfs_add_unused_block_group Triggered which block group is added to unused_bgs list. 3) btrfs_skip_unused_block_group Triggered which unused block group is not deleted. These trace events is pretty handy to debug case related to block group auto remove. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba --- fs/btrfs/extent-tree.c | 4 ++++ fs/btrfs/scrub.c | 1 + include/trace/events/btrfs.h | 41 ++++++++++++++++++++++++++++++++++++ 3 files changed, 46 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index bf30be868f7a..5a0c7fcf01fb 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6352,6 +6352,7 @@ static int update_block_group(struct btrfs_trans_handle *trans, spin_lock(&info->unused_bgs_lock); if (list_empty(&cache->bg_list)) { btrfs_get_block_group(cache); + trace_btrfs_add_unused_block_group(cache); list_add_tail(&cache->bg_list, &info->unused_bgs); } @@ -10206,6 +10207,7 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info) /* Should always be true but just in case. */ if (list_empty(&cache->bg_list)) { btrfs_get_block_group(cache); + trace_btrfs_add_unused_block_group(cache); list_add_tail(&cache->bg_list, &info->unused_bgs); } @@ -10393,6 +10395,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, BUG_ON(!block_group); BUG_ON(!block_group->ro); + trace_btrfs_remove_block_group(block_group); /* * Free the reserved super bytes from this block group before * remove it. @@ -10757,6 +10760,7 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) * the ro check in case balance is currently acting on * this block group. */ + trace_btrfs_skip_unused_block_group(block_group); spin_unlock(&block_group->lock); up_write(&space_info->groups_sem); goto next; diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 52b39a0924e9..a59005862010 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -3984,6 +3984,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, spin_lock(&fs_info->unused_bgs_lock); if (list_empty(&cache->bg_list)) { btrfs_get_block_group(cache); + trace_btrfs_add_unused_block_group(cache); list_add_tail(&cache->bg_list, &fs_info->unused_bgs); } diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h index 5af2479e9b16..38f444bf55fe 100644 --- a/include/trace/events/btrfs.h +++ b/include/trace/events/btrfs.h @@ -1805,6 +1805,47 @@ TRACE_EVENT(btrfs_inode_mod_outstanding_extents, __entry->ino, __entry->mod) ); +DECLARE_EVENT_CLASS(btrfs__block_group, + TP_PROTO(const struct btrfs_block_group_cache *bg_cache), + + TP_ARGS(bg_cache), + + TP_STRUCT__entry_btrfs( + __field( u64, bytenr ) + __field( u64, flags ) + __field( u64, len ) + __field( u64, used ) + ), + + TP_fast_assign_btrfs(bg_cache->fs_info, + __entry->bytenr = bg_cache->key.objectid, + __entry->len = bg_cache->key.offset, + __entry->flags = bg_cache->flags; + __entry->used = btrfs_block_group_used(&bg_cache->item); + ), + + TP_printk_btrfs("bg bytenr=%llu len=%llu used=%llu flags=%llu(%s)", + __entry->bytenr, __entry->len, __entry->used, __entry->flags, + __print_flags(__entry->flags, "|", BTRFS_GROUP_FLAGS)) +); + +DEFINE_EVENT(btrfs__block_group, btrfs_remove_block_group, + TP_PROTO(const struct btrfs_block_group_cache *bg_cache), + + TP_ARGS(bg_cache) +); + +DEFINE_EVENT(btrfs__block_group, btrfs_add_unused_block_group, + TP_PROTO(const struct btrfs_block_group_cache *bg_cache), + + TP_ARGS(bg_cache) +); + +DEFINE_EVENT(btrfs__block_group, btrfs_skip_unused_block_group, + TP_PROTO(const struct btrfs_block_group_cache *bg_cache), + + TP_ARGS(bg_cache) +); #endif /* _TRACE_BTRFS_H */ /* This part must be outside protection */