[PATCH 14/27] writeback: account per-bdi accumulated dirtied pages

[Wu Fengguang]

Introduce the BDI_DIRTIED counter. It will be used for estimating the
bdi's dirty bandwidth.

CC: Jan Kara <jack@xxxxxxx>
CC: Michael Rubin <mrubin@xxxxxxxxxx>
CC: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
 include/linux/backing-dev.h |    1 +
 mm/backing-dev.c            |    2 ++
 mm/page-writeback.c         |    1 +
 3 files changed, 4 insertions(+)

--- linux-next.orig/include/linux/backing-dev.h	2011-03-03 14:44:16.000000000 +0800
+++ linux-next/include/linux/backing-dev.h	2011-03-03 14:44:18.000000000 +0800
@@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int);
 enum bdi_stat_item {
 	BDI_RECLAIMABLE,
 	BDI_WRITEBACK,
+	BDI_DIRTIED,
 	BDI_WRITTEN,
 	NR_BDI_STAT_ITEMS
 };
--- linux-next.orig/mm/page-writeback.c	2011-03-03 14:44:16.000000000 +0800
+++ linux-next/mm/page-writeback.c	2011-03-03 14:44:18.000000000 +0800
@@ -1127,6 +1127,7 @@ void account_page_dirtied(struct page *p
 		__inc_zone_page_state(page, NR_FILE_DIRTY);
 		__inc_zone_page_state(page, NR_DIRTIED);
 		__inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
+		__inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED);
 		task_dirty_inc(current);
 		task_io_account_write(PAGE_CACHE_SIZE);
 	}
--- linux-next.orig/mm/backing-dev.c	2011-03-03 14:44:16.000000000 +0800
+++ linux-next/mm/backing-dev.c	2011-03-03 14:44:18.000000000 +0800
@@ -92,6 +92,7 @@ static int bdi_debug_stats_show(struct s
 		   "BdiDirtyThresh:   %8lu kB\n"
 		   "DirtyThresh:      %8lu kB\n"
 		   "BackgroundThresh: %8lu kB\n"
+		   "BdiDirtied:       %8lu kB\n"
 		   "BdiWritten:       %8lu kB\n"
 		   "b_dirty:          %8lu\n"
 		   "b_io:             %8lu\n"
@@ -101,6 +102,7 @@ static int bdi_debug_stats_show(struct s
 		   (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
 		   (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
 		   K(bdi_thresh), K(dirty_thresh), K(background_thresh),
+		   (unsigned long) K(bdi_stat(bdi, BDI_DIRTIED)),
 		   (unsigned long) K(bdi_stat(bdi, BDI_WRITTEN)),
 		   nr_dirty, nr_io, nr_more_io,
 		   !list_empty(&bdi->bdi_list), bdi->state);


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