diff options
| author | Wu Fengguang <fengguang.wu@intel.com> | 2010-12-06 22:34:29 -0600 |
|---|---|---|
| committer | Wu Fengguang <fengguang.wu@intel.com> | 2011-07-09 22:09:03 -0700 |
| commit | e1cbe236013c82bcf9a156e98d7b47efb89d2674 (patch) | |
| tree | c2f1764a3d07fd01fdbe6fd7d6ecd647557808d5 | |
| parent | ffd1f609ab10532e8137b4b981fdf903ef4d0b32 (diff) | |
writeback: trace global_dirty_state
Add trace event balance_dirty_state for showing the global dirty page
counts and thresholds at each global_dirty_limits() invocation. This
will cover the callers throttle_vm_writeout(), over_bground_thresh()
and each balance_dirty_pages() loop.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
| -rw-r--r-- | include/trace/events/writeback.h | 46 | ||||
| -rw-r--r-- | mm/page-writeback.c | 1 |
2 files changed, 47 insertions, 0 deletions
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h index 3e7662a0cfa..6bca4cc0063 100644 --- a/include/trace/events/writeback.h +++ b/include/trace/events/writeback.h @@ -204,6 +204,52 @@ TRACE_EVENT(writeback_queue_io, __entry->moved) ); +TRACE_EVENT(global_dirty_state, + + TP_PROTO(unsigned long background_thresh, + unsigned long dirty_thresh + ), + + TP_ARGS(background_thresh, + dirty_thresh + ), + + TP_STRUCT__entry( + __field(unsigned long, nr_dirty) + __field(unsigned long, nr_writeback) + __field(unsigned long, nr_unstable) + __field(unsigned long, background_thresh) + __field(unsigned long, dirty_thresh) + __field(unsigned long, dirty_limit) + __field(unsigned long, nr_dirtied) + __field(unsigned long, nr_written) + ), + + TP_fast_assign( + __entry->nr_dirty = global_page_state(NR_FILE_DIRTY); + __entry->nr_writeback = global_page_state(NR_WRITEBACK); + __entry->nr_unstable = global_page_state(NR_UNSTABLE_NFS); + __entry->nr_dirtied = global_page_state(NR_DIRTIED); + __entry->nr_written = global_page_state(NR_WRITTEN); + __entry->background_thresh = background_thresh; + __entry->dirty_thresh = dirty_thresh; + __entry->dirty_limit = global_dirty_limit; + ), + + TP_printk("dirty=%lu writeback=%lu unstable=%lu " + "bg_thresh=%lu thresh=%lu limit=%lu " + "dirtied=%lu written=%lu", + __entry->nr_dirty, + __entry->nr_writeback, + __entry->nr_unstable, + __entry->background_thresh, + __entry->dirty_thresh, + __entry->dirty_limit, + __entry->nr_dirtied, + __entry->nr_written + ) +); + DECLARE_EVENT_CLASS(writeback_congest_waited_template, TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed), diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 798842a2247..f9d9f5476d5 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -447,6 +447,7 @@ void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty) } *pbackground = background; *pdirty = dirty; + trace_global_dirty_state(background, dirty); } /** |