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Commit ea941f0e authored by Michael Rubin's avatar Michael Rubin Committed by Linus Torvalds
Browse files

writeback: add nr_dirtied and nr_written to /proc/vmstat 



To help developers and applications gain visibility into writeback
behaviour adding two entries to vm_stat_items and /proc/vmstat.  This will
allow us to track the "written" and "dirtied" counts.

   # grep nr_dirtied /proc/vmstat
   nr_dirtied 3747
   # grep nr_written /proc/vmstat
   nr_written 3618

Signed-off-by: default avatarMichael Rubin <mrubin@google.com>
Reviewed-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f629d1c9

include/linux/mmzone.h

+2 −0
Original line number Diff line number Diff line
@@ -104,6 +104,8 @@ enum zone_stat_item { 
	NR_ISOLATED_ANON,	/* Temporary isolated pages from anon lru */

	NR_ISOLATED_FILE,	/* Temporary isolated pages from file lru */

	NR_SHMEM,		/* shmem pages (included tmpfs/GEM pages) */

	NR_DIRTIED,		/* page dirtyings since bootup */

	NR_WRITTEN,		/* page writings since bootup */

#ifdef CONFIG_NUMA

	NUMA_HIT,		/* allocated in intended node */

	NUMA_MISS,		/* allocated in non intended node */

mm/page-writeback.c

+2 −0
Original line number Diff line number Diff line
@@ -1121,6 +1121,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping) 
{

	if (mapping_cap_account_dirty(mapping)) {

		__inc_zone_page_state(page, NR_FILE_DIRTY);

		__inc_zone_page_state(page, NR_DIRTIED);

		__inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);

		task_dirty_inc(current);

		task_io_account_write(PAGE_CACHE_SIZE);
@@ -1136,6 +1137,7 @@ EXPORT_SYMBOL(account_page_dirtied); 
void account_page_writeback(struct page *page)

{

	inc_zone_page_state(page, NR_WRITEBACK);

	inc_zone_page_state(page, NR_WRITTEN);

}

EXPORT_SYMBOL(account_page_writeback);

mm/vmstat.c

+3 −0
Original line number Diff line number Diff line
@@ -745,6 +745,9 @@ static const char * const vmstat_text[] = { 
	"nr_isolated_anon",

	"nr_isolated_file",

	"nr_shmem",

	"nr_dirtied",

	"nr_written",



#ifdef CONFIG_NUMA

	"numa_hit",

	"numa_miss",