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: Michael Rubin <mrubin@google.com>
Reviewed-by: Wu 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 3984c4e..c3c17fb 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -104,6 +104,8 @@
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 */
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 9415981..4dd91f7 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1121,6 +1121,7 @@
{
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 @@
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);
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 355a9e6..44e7ac0 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -745,6 +745,9 @@
"nr_isolated_anon",
"nr_isolated_file",
"nr_shmem",
+ "nr_dirtied",
+ "nr_written",
+
#ifdef CONFIG_NUMA
"numa_hit",
"numa_miss",