[Virtio-fs] [PATCH 0/2][RFC] virtio-fs: Add some tracepoints

[Masayoshi Mizuma]

From: Masayoshi Mizuma <m.mizuma at jp.fujitsu.com>

This patch series introduce some tracepoints. It will be
useful to debug the I/O request flow.

New trace events:

  - virtiofs_request_dispatched
  - virtiofs_request_done
  - virtiofs_hiprio_request_dispatched
  - virtiofs_hiprio_request_done

Above trace events is added to the following functions as
the tracepoints:

  - virtio_fs_enqueue_req
  - virtio_fs_requests_done_work
  - virtio_fs_hiprio_dispatch_work
  - virtio_fs_hiprio_done_work

Example of the trace record:

  cat-1420       [002] .... 34.687462: virtiofs_request_dispatched: opcode
      FUSE_READ unique 0x1a nodeid 0x2 in.len 80 flags ISREPLY|WAITING|SENT
      notify 1
  kworker/4:1-67 [004] .... 34.687531: virtiofs_request_done: opcode FUSE_READ
      unique 0x1a nodeid 0x2 in.len 80 flags ISREPLY|WAITING

Masayoshi Mizuma (2):
  add ftrace events
  add tracepoints

 fs/fuse/virtio_fs.c             |  21 ++++
 include/trace/events/virtiofs.h | 195 ++++++++++++++++++++++++++++++++
 2 files changed, 216 insertions(+)
 create mode 100644 include/trace/events/virtiofs.h

-- 
2.18.1