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@xxxxxxxxx>
---
include/trace/events/writeback.h | 48 +++++++++++++++++++++++++++++
mm/page-writeback.c | 1
2 files changed, 49 insertions(+)
--- linux-next.orig/mm/page-writeback.c 2011-04-16 11:28:28.000000000 +0800
+++ linux-next/mm/page-writeback.c 2011-04-16 11:28:30.000000000 +0800
@@ -387,6 +387,7 @@ void global_dirty_limits(unsigned long *
tsk = current;
*pbackground = background;
*pdirty = dirty;
+ trace_global_dirty_state(background, dirty);
}
/**
--- linux-next.orig/include/trace/events/writeback.h 2011-04-16 11:28:28.000000000 +0800
+++ linux-next/include/trace/events/writeback.h 2011-04-16 11:28:30.000000000 +0800
@@ -277,6 +277,54 @@ 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, 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 = default_backing_dev_info.dirty_threshold;
+ ),
+
+ TP_printk("dirty=%lu writeback=%lu unstable=%lu "
+ "bg_thresh=%lu thresh=%lu limit=%lu gap=%ld "
+ "dirtied=%lu written=%lu",
+ __entry->nr_dirty,
+ __entry->nr_writeback,
+ __entry->nr_unstable,
+ __entry->background_thresh,
+ __entry->dirty_thresh,
+ __entry->dirty_limit,
+ __entry->dirty_thresh - __entry->nr_dirty -
+ __entry->nr_writeback - __entry->nr_unstable,
+ __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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