Add zone->aging_rounds to evaluate the balancing work.
It means how many rounds the zone has been fully scanned.
Signed-off-by: Wu Fengguang <[email protected]>
---
include/linux/mmzone.h | 1 +
mm/page_alloc.c | 5 +++++
mm/vmscan.c | 4 +++-
3 files changed, 9 insertions(+), 1 deletion(-)
--- linux.orig/include/linux/mmzone.h
+++ linux/include/linux/mmzone.h
@@ -160,6 +160,7 @@ struct zone {
*/
unsigned long aging_total;
unsigned long aging_milestone;
+ unsigned long aging_rounds;
unsigned long page_age;
/*
--- linux.orig/mm/page_alloc.c
+++ linux/mm/page_alloc.c
@@ -1523,6 +1523,7 @@ void show_free_areas(void)
" inactive:%lukB"
" present:%lukB"
" aging:%lukB"
+ " aging_rounds:%lukB"
" age:%lu"
" pages_scanned:%lu"
" all_unreclaimable? %s"
@@ -1536,6 +1537,7 @@ void show_free_areas(void)
K(zone->nr_inactive),
K(zone->present_pages),
K(zone->aging_total),
+ zone->aging_rounds,
zone->page_age,
zone->pages_scanned,
(zone->all_unreclaimable ? "yes" : "no")
@@ -2149,6 +2151,7 @@ static void __init free_area_init_core(s
zone->nr_inactive = 0;
zone->aging_total = 0;
zone->aging_milestone = 0;
+ zone->aging_rounds = 0;
zone->page_age = 0;
atomic_set(&zone->reclaim_in_progress, 0);
if (!size)
@@ -2299,6 +2302,7 @@ static int zoneinfo_show(struct seq_file
"\n active %lu"
"\n inactive %lu"
"\n aging %lu"
+ "\n rounds %lu"
"\n age %lu"
"\n scanned %lu (a: %lu)"
"\n spanned %lu"
@@ -2310,6 +2314,7 @@ static int zoneinfo_show(struct seq_file
zone->nr_active,
zone->nr_inactive,
zone->aging_total,
+ zone->aging_rounds,
zone->page_age,
zone->pages_scanned,
zone->nr_scan_active / 1024,
--- linux.orig/mm/vmscan.c
+++ linux/mm/vmscan.c
@@ -157,8 +157,10 @@ static inline void update_zone_age(struc
z->aging_total += nr_scan;
- if (z->aging_total - z->aging_milestone > len)
+ if (z->aging_total - z->aging_milestone > len) {
z->aging_milestone += len;
+ z->aging_rounds++;
+ }
z->page_age = ((z->aging_total - z->aging_milestone)
<< PAGE_AGE_SHIFT) / len;
--