Commit 71927e84 authored by Wu Fengguang's avatar Wu Fengguang Committed by Linus Torvalds
Browse files

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: default avatarChristoph Hellwig <hch@infradead.org>
Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jan Engelhardt <jengelh@medozas.de>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6585027a

fs/fs-writeback.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

include/trace/events/writeback.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

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