Subject: writeback: trace global_dirty_state Date: Mon Dec 06 22:34:29 CST 2010 Add trace balance_dirty_state for showing the global dirty page counts and thresholds at each balance_dirty_pages() loop. Signed-off-by: Wu Fengguang --- include/trace/events/writeback.h | 48 +++++++++++++++++++++++++++++ mm/page-writeback.c | 1 2 files changed, 49 insertions(+) --- linux-2.6.orig/mm/page-writeback.c 2011-03-08 05:23:30.000000000 -0800 +++ linux-2.6/mm/page-writeback.c 2011-03-08 05:24:47.000000000 -0800 @@ -449,6 +449,7 @@ void global_dirty_limits(unsigned long * } *pbackground = background; *pdirty = dirty; + trace_global_dirty_state(background, dirty); } /* --- linux-2.6.orig/include/trace/events/writeback.h 2011-03-08 05:22:17.000000000 -0800 +++ linux-2.6/include/trace/events/writeback.h 2011-03-08 05:24:47.000000000 -0800 @@ -325,6 +325,54 @@ TRACE_EVENT(balance_dirty_pages, ) ); +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, poll_thresh) + __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->poll_thresh = 0; + ), + + TP_printk("dirty=%lu writeback=%lu unstable=%lu " + "bg_thresh=%lu thresh=%lu gap=%ld poll=%ld " + "dirtied=%lu written=%lu", + __entry->nr_dirty, + __entry->nr_writeback, + __entry->nr_unstable, + __entry->background_thresh, + __entry->dirty_thresh, + __entry->dirty_thresh - __entry->nr_dirty - + __entry->nr_writeback - __entry->nr_unstable, + __entry->poll_thresh, + __entry->nr_dirtied, + __entry->nr_written + ) +); + DECLARE_EVENT_CLASS(writeback_congest_waited_template, TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),