commit 603320239fb436f175c8b6bfa43d5023c47a6dc2
author Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Sun Jul 25 14:29:24 2010 +0300
committer Jens Axboe <jaxboe@fusionio.com> Sat Aug 07 18:53:56 2010 +0200
tree efe1e78de6c2b8029cdcdcad2e98e3ef6c017900
parent b5048a6cb5455a16bdff26a4c5ae9534f070d94c

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>