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writeback: account per-bdi accumulated written pages

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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().

CC: Michael Rubin <mrubin@google.com>
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>
This commit is contained in:
Jan Kara 2010-12-08 22:44:24 -06:00 committed by Wu Fengguang
parent d46db3d582
commit f7d2b1ecd0
3 changed files with 10 additions and 2 deletions
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1
include/linux/backing-dev.h
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@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int);
enum bdi_stat_item { enum bdi_stat_item {
BDI_RECLAIMABLE, BDI_RECLAIMABLE,
BDI_WRITEBACK, BDI_WRITEBACK,
BDI_WRITTEN,
NR_BDI_STAT_ITEMS NR_BDI_STAT_ITEMS
}; };

10
mm/backing-dev.c
View File

@ -97,6 +97,7 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
"BdiDirtyThresh: %8lu kB\n" "BdiDirtyThresh: %8lu kB\n"
"DirtyThresh: %8lu kB\n" "DirtyThresh: %8lu kB\n"
"BackgroundThresh: %8lu kB\n" "BackgroundThresh: %8lu kB\n"
"BdiWritten: %8lu kB\n"
"b_dirty: %8lu\n" "b_dirty: %8lu\n"
"b_io: %8lu\n" "b_io: %8lu\n"
"b_more_io: %8lu\n" "b_more_io: %8lu\n"
@ -104,8 +105,13 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
"state: %8lx\n", "state: %8lx\n",
(unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)), (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
(unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)), (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
K(bdi_thresh), K(dirty_thresh), K(bdi_thresh),
K(background_thresh), nr_dirty, nr_io, nr_more_io, 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); !list_empty(&bdi->bdi_list), bdi->state);
#undef K #undef K

1
mm/page-writeback.c
View File

@ -219,6 +219,7 @@ int dirty_bytes_handler(struct ctl_table *table, int write,
*/ */
static inline void __bdi_writeout_inc(struct backing_dev_info *bdi) 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, __prop_inc_percpu_max(&vm_completions, &bdi->completions,
bdi->max_prop_frac); bdi->max_prop_frac);
} }