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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-07-25 14:29:24 +0300
committerJens Axboe <jaxboe@fusionio.com>2010-08-07 18:53:56 +0200
commit603320239fb436f175c8b6bfa43d5023c47a6dc2 (patch)
treeefe1e78de6c2b8029cdcdcad2e98e3ef6c017900 /mm/backing-dev.c
parentb5048a6cb5455a16bdff26a4c5ae9534f070d94c (diff)
downloadlinux-603320239fb436f175c8b6bfa43d5023c47a6dc2.tar.gz
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>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 99890831d55..9008c4e207f 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -310,6 +310,7 @@ static void wakeup_timer_fn(unsigned long data)
spin_lock_bh(&bdi->wb_lock);
if (bdi->wb.task) {
+ trace_writeback_wake_thread(bdi);
wake_up_process(bdi->wb.task);
} else {
/*
@@ -317,6 +318,7 @@ static void wakeup_timer_fn(unsigned long data)
* In this case we have to wake-up the forker thread which
* should create and run the bdi thread.
*/
+ trace_writeback_wake_forker_thread(bdi);
wake_up_process(default_backing_dev_info.wb.task);
}
spin_unlock_bh(&bdi->wb_lock);