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From: Josef Bacik <josef@toxicpanda.com>
To: linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH 3/7] btrfs: add space reservation tracepoint for reserved bytes
Date: Fri,  9 Aug 2019 09:33:23 -0400
Message-ID: <20190809133327.26509-4-josef@toxicpanda.com> (raw)
In-Reply-To: <20190809133327.26509-1-josef@toxicpanda.com>

I noticed when folding the trace_btrfs_space_reservation() tracepoint
into the btrfs_space_info_update_* helpers that we didn't emit a
tracepoint when doing btrfs_add_reserved_bytes().  I know this is
because we were swapping bytes_may_use for bytes_reserved, so in my mind
there was no reason to have the tracepoint there.  But now there is
because we always emit the unreserve for the bytes_may_use side, and
this would have broken if compression was on anyway.  Add a tracepoint
to cover the bytes_reserved counter so the math still comes out right.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/block-group.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 9867c5d98650..afae5c731904 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -2758,6 +2758,8 @@ int btrfs_add_reserved_bytes(struct btrfs_block_group_cache *cache,
 	} else {
 		cache->reserved += num_bytes;
 		space_info->bytes_reserved += num_bytes;
+		trace_btrfs_space_reservation(cache->fs_info, "space_info",
+					      space_info->flags, num_bytes, 1);
 		btrfs_space_info_update_bytes_may_use(cache->fs_info,
 						      space_info, -ram_bytes);
 		if (delalloc)
-- 
2.21.0


  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-09 13:33 [PATCH 0/7] Rework reserve ticket handling Josef Bacik
2019-08-09 13:33 ` [PATCH 1/7] btrfs: do not allow reservations if we have pending tickets Josef Bacik
2019-08-09 13:33 ` [PATCH 2/7] btrfs: roll tracepoint into btrfs_space_info_update helper Josef Bacik
2019-08-09 13:33 ` Josef Bacik [this message]
2019-08-09 13:33 ` [PATCH 4/7] btrfs: rework btrfs_space_info_add_old_bytes Josef Bacik
2019-08-09 13:33 ` [PATCH 5/7] btrfs: refactor the ticket wakeup code Josef Bacik
2019-08-09 13:33 ` [PATCH 6/7] btrfs: rework wake_all_tickets Josef Bacik
2019-08-09 13:33 ` [PATCH 7/7] btrfs: remove orig_bytes from reserve_ticket Josef Bacik

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