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| author | Wu Fengguang <fengguang.wu@intel.com> | 2011-01-14 02:45:46 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-14 04:32:32 +0300 |
| commit | 71927e84e0aebfbe5a91565c3b207af25a4e9162 (patch) | |
| tree | 8271f6d2008405bd392893ab0f7a4bd25653dc90 | |
| parent | 6585027a5e8cb490e3a761b2f3f3c3acf722aff2 (diff) | |
| download | linux-71927e84e0aebfbe5a91565c3b207af25a4e9162.tar.xz | |
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 <hch@infradead.org>
Signed-off-by: Wu 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/fs-writeback.c | 1 | ||||
| -rw-r--r-- | include/trace/events/writeback.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 3a07f6d8bc0b..482de0a92ca7 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 89a2b2db4375..4e249b927eaa 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); |