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Subject[PATCH 3/5] writeback: nr_dirtied and nr_written in /proc/vmstat
Date
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_cleaned 3618

Signed-off-by: Michael Rubin <mrubin@google.com>
---
include/linux/mmzone.h | 2 ++
mm/page-writeback.c | 2 ++
mm/vmstat.c | 3 +++
3 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 6e6e626..d0d7454 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -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_FILE_DIRTIED, /* accumulated dirty pages */
+ NR_WRITTEN, /* accumulated written pages */
#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 ae5f5d5..4d6ef9c 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1126,6 +1126,7 @@ 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_FILE_DIRTIED);
__inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
task_dirty_inc(current);
task_io_account_write(PAGE_CACHE_SIZE);
@@ -1141,6 +1142,7 @@ 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);

diff --git a/mm/vmstat.c b/mm/vmstat.c
index f389168..d448ef4 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -732,6 +732,9 @@ 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",
--
1.7.1


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