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    Subject[PATCH 24/27] writeback: trace global_dirty_state
    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 <fengguang.wu@intel.com>
    ---
    include/trace/events/writeback.h | 48 +++++++++++++++++++++++++++++
    mm/page-writeback.c | 1
    2 files changed, 49 insertions(+)

    --- linux-next.orig/mm/page-writeback.c 2011-03-03 14:02:58.000000000 +0800
    +++ linux-next/mm/page-writeback.c 2011-03-03 14:03:24.000000000 +0800
    @@ -386,6 +386,7 @@ void global_dirty_limits(unsigned long *
    tsk = current;
    *pbackground = background;
    *pdirty = dirty;
    + trace_global_dirty_state(background, dirty);
    }
    EXPORT_SYMBOL_GPL(global_dirty_limits);

    --- linux-next.orig/include/trace/events/writeback.h 2011-03-03 14:02:58.000000000 +0800
    +++ linux-next/include/trace/events/writeback.h 2011-03-03 14:03:24.000000000 +0800
    @@ -287,6 +287,54 @@ 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 = current->nr_dirtied_pause;
    + ),
    +
    + 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),



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