[PATCH 09/35] writeback: account per-bdi accumulated written pages

Wu Fengguang
2010-12-13T15:09:09Z

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From: Jan Kara <jack@suse.cz>

Introduce the BDI_WRITTEN counter. It will be used for estimating the
bdi's write bandwidth.

Peter Zijlstra <a.p.zijlstra@chello.nl>:
Move BDI_WRITTEN accounting into __bdi_writeout_inc().
This will cover and fix fuse, which only calls bdi_writeout_inc().

Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
include/linux/backing-dev.h | 1 +
mm/backing-dev.c | 6 ++++--
mm/page-writeback.c | 1 +
3 files changed, 6 insertions(+), 2 deletions(-)

--- linux-next.orig/include/linux/backing-dev.h 2010-12-13 21:45:57.000000000 +0800
+++ linux-next/include/linux/backing-dev.h 2010-12-13 21:46:13.000000000 +0800
@@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int);
enum bdi_stat_item {
BDI_RECLAIMABLE,
BDI_WRITEBACK,
+ BDI_WRITTEN,
NR_BDI_STAT_ITEMS
};

--- linux-next.orig/mm/backing-dev.c 2010-12-13 21:46:10.000000000 +0800
+++ linux-next/mm/backing-dev.c 2010-12-13 21:46:13.000000000 +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"
+ "BdiWritten: %8lu kB\n"
"b_dirty: %8lu\n"
"b_io: %8lu\n"
"b_more_io: %8lu\n"
@@ -99,8 +100,9 @@ static int bdi_debug_stats_show(struct s
"state: %8lx\n",
(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), nr_dirty, nr_io, nr_more_io,
+ K(bdi_thresh), K(dirty_thresh), K(background_thresh),
+ (unsigned long) K(bdi_stat(bdi, BDI_WRITTEN)),
+ nr_dirty, nr_io, nr_more_io,
!list_empty(&bdi->bdi_list), bdi->state);
#undef K

--- linux-next.orig/mm/page-writeback.c 2010-12-13 21:46:13.000000000 +0800
+++ linux-next/mm/page-writeback.c 2010-12-13 21:46:13.000000000 +0800
@@ -204,6 +204,7 @@ int dirty_bytes_handler(struct ctl_table
*/
static inline void __bdi_writeout_inc(struct backing_dev_info *bdi)
{
+ __inc_bdi_stat(bdi, BDI_WRITTEN);
__prop_inc_percpu_max(&vm_completions, &bdi->completions,
bdi->max_prop_frac);
}