tree efe1e78de6c2b8029cdcdcad2e98e3ef6c017900
parent b5048a6cb5455a16bdff26a4c5ae9534f070d94c
author Artem Bityutskiy <Artem.Bityutskiy@nokia.com> 1280057364 +0300
committer Jens Axboe <jaxboe@fusionio.com> 1281200036 +0200

writeback: add new tracepoints

Add 2 new trace points to the periodic write-back wake up case, just like we do
in the 'bdi_queue_work()' function. Namely, introduce:

1. trace_writeback_wake_thread(bdi)
2. trace_writeback_wake_forker_thread(bdi)

The first event is triggered every time we wake up a bdi thread to start
periodic background write-out. The second event is triggered only when the bdi
thread does not exist and should be created by the forker thread.

This patch was suggested by Dave Chinner and Christoph Hellwig.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>