From 71927e84e0aebfbe5a91565c3b207af25a4e9162 Mon Sep 17 00:00:00 2001 From: Wu Fengguang Date: Thu, 13 Jan 2011 15:45:46 -0800 Subject: [PATCH] writeback: trace wakeup event for background writeback This tracks when balance_dirty_pages() tries to wakeup the flusher thread for background writeback (if it was not started already). Suggested-by: Christoph Hellwig Signed-off-by: Wu Fengguang Cc: Jan Kara Cc: Johannes Weiner Cc: Dave Chinner Cc: Jan Engelhardt Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/fs-writeback.c | 1 + include/trace/events/writeback.h | 1 + 2 files changed, 2 insertions(+) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 3a07f6d..482de0a 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -169,6 +169,7 @@ void bdi_start_background_writeback(struct backing_dev_info *bdi) * We just wake up the flusher thread. It will perform background * writeback as soon as there is no other work to do. */ + trace_writeback_wake_background(bdi); spin_lock_bh(&bdi->wb_lock); bdi_wakeup_flusher(bdi); spin_unlock_bh(&bdi->wb_lock); diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h index 89a2b2d..4e249b9 100644 --- a/include/trace/events/writeback.h +++ b/include/trace/events/writeback.h @@ -81,6 +81,7 @@ DEFINE_EVENT(writeback_class, name, \ TP_ARGS(bdi)) DEFINE_WRITEBACK_EVENT(writeback_nowork); +DEFINE_WRITEBACK_EVENT(writeback_wake_background); DEFINE_WRITEBACK_EVENT(writeback_wake_thread); DEFINE_WRITEBACK_EVENT(writeback_wake_forker_thread); DEFINE_WRITEBACK_EVENT(writeback_bdi_register); -- 2.7.4