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| author | Curt Wohlgemuth <curtw@google.com> | 2011-10-07 21:54:10 -0600 |
|---|---|---|
| committer | Wu Fengguang <fengguang.wu@intel.com> | 2011-10-31 00:33:36 +0800 |
| commit | 0e175a1835ffc979e55787774e58ec79e41957d7 (patch) | |
| tree | 6ec4b65a8de4e9d1c12d26a1079079ed81d79450 /mm/page-writeback.c | |
| parent | ad4e38dd6a33bb3a4882c487d7abe621e583b982 (diff) | |
| download | lwn-0e175a1835ffc979e55787774e58ec79e41957d7.tar.gz lwn-0e175a1835ffc979e55787774e58ec79e41957d7.zip | |
writeback: Add a 'reason' to wb_writeback_work
This creates a new 'reason' field in a wb_writeback_work
structure, which unambiguously identifies who initiates
writeback activity. A 'wb_reason' enumeration has been
added to writeback.h, to enumerate the possible reasons.
The 'writeback_work_class' and tracepoint event class and
'writeback_queue_io' tracepoints are updated to include the
symbolic 'reason' in all trace events.
And the 'writeback_inodes_sbXXX' family of routines has had
a wb_stats parameter added to them, so callers can specify
why writeback is being started.
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 45d36f7dc169..650846b61584 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1301,7 +1301,8 @@ void laptop_mode_timer_fn(unsigned long data) * threshold */ if (bdi_has_dirty_io(&q->backing_dev_info)) - bdi_start_writeback(&q->backing_dev_info, nr_pages); + bdi_start_writeback(&q->backing_dev_info, nr_pages, + WB_REASON_LAPTOP_TIMER); } /* |