From: Jan Kara <jack@xxxxxxx>
Introduce the BDI_WRITTEN counter. It will be used for estimating the
bdi's write bandwidth.
Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>:
Move BDI_WRITTEN accounting into __bdi_writeout_inc().
This will cover and fix fuse, which only calls bdi_writeout_inc().
CC: Michael Rubin <mrubin@xxxxxxxxxx>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
include/linux/backing-dev.h | 1 +
mm/backing-dev.c | 10 ++++++++--
mm/page-writeback.c | 1 +
3 files changed, 10 insertions(+), 2 deletions(-)
--- linux-next.orig/include/linux/backing-dev.h 2011-06-12 13:29:02.000000000 +0800
+++ linux-next/include/linux/backing-dev.h 2011-06-12 20:48:47.000000000 +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 2011-06-12 13:29:02.000000000 +0800
+++ linux-next/mm/backing-dev.c 2011-06-12 20:49:51.000000000 +0800
@@ -97,6 +97,7 @@ 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"
@@ -104,8 +105,13 @@ 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 2011-06-12 13:29:06.000000000 +0800
+++ linux-next/mm/page-writeback.c 2011-06-12 20:48:47.000000000 +0800
@@ -219,6 +219,7 @@ 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);
}
--
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