diff options
| author | Josef Bacik | 2020-10-09 09:28:19 -0400 |
|---|---|---|
| committer | David Sterba | 2021-02-08 22:58:58 +0100 |
| commit | ac1ea10e757a57fb61512ae9beb2ef67e5340e31 (patch) | |
| tree | dab384f192cb229fcbe3929615fb502cb2debc63 /include/trace | |
| parent | 91e79a83fff663283341c8c29293faec8255099a (diff) | |
btrfs: add a trace point for reserve tickets
While debugging a ENOSPC related performance problem I needed to see the
time difference between start and end of a reserve ticket, so add a
trace point to report when we handle a reserve ticket.
I opted to spit out start_ns itself without calculating the difference
because there could be a gap between enabling the tracepoint and setting
start_ns. Doing it this way allows us to filter on 0 start_ns so we
don't get bogus entries, and we can easily calculate the time difference
with bpftrace or something else.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'include/trace')
| -rw-r--r-- | include/trace/events/btrfs.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h index b9896fc06160..b0ea2a108be3 100644 --- a/include/trace/events/btrfs.h +++ b/include/trace/events/btrfs.h @@ -2026,6 +2026,35 @@ TRACE_EVENT(btrfs_convert_extent_bit, __print_flags(__entry->clear_bits, "|", EXTENT_FLAGS)) ); +TRACE_EVENT(btrfs_reserve_ticket, + TP_PROTO(const struct btrfs_fs_info *fs_info, u64 flags, u64 bytes, + u64 start_ns, int flush, int error), + + TP_ARGS(fs_info, flags, bytes, start_ns, flush, error), + + TP_STRUCT__entry_btrfs( + __field( u64, flags ) + __field( u64, bytes ) + __field( u64, start_ns ) + __field( int, flush ) + __field( int, error ) + ), + + TP_fast_assign_btrfs(fs_info, + __entry->flags = flags; + __entry->bytes = bytes; + __entry->start_ns = start_ns; + __entry->flush = flush; + __entry->error = error; + ), + + TP_printk_btrfs("flags=%s bytes=%llu start_ns=%llu flush=%s error=%d", + __print_flags(__entry->flags, "|", BTRFS_GROUP_FLAGS), + __entry->bytes, __entry->start_ns, + __print_symbolic(__entry->flush, FLUSH_ACTIONS), + __entry->error) +); + DECLARE_EVENT_CLASS(btrfs_sleep_tree_lock, TP_PROTO(const struct extent_buffer *eb, u64 start_ns), |