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Subject[PATCH 14/27] writeback: account per-bdi accumulated dirtied pages
Introduce the BDI_DIRTIED counter. It will be used for estimating the
bdi's dirty bandwidth.

CC: Jan Kara <jack@suse.cz>
CC: Michael Rubin <mrubin@google.com>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
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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