Messages in this thread Patch in this message | | | From | KOSAKI Motohiro <> | Subject | [PATCH 3/4] vmstat: add anon_scan_ratio field to zoneinfo | Date | Mon, 28 Dec 2009 16:48:51 +0900 (JST) |
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Vmscan folks was asked "why does my system makes so much swap-out?" in lkml at several times. At that time, I made the debug patch to show recent_anon_{scanned/rorated} parameter at least three times.
Thus, its parameter should be showed on /proc/zoneinfo. It help vmscan folks debugging.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> --- include/linux/swap.h | 2 ++ mm/vmscan.c | 15 +++++++++++++++ mm/vmstat.c | 7 +++++-- 3 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/include/linux/swap.h b/include/linux/swap.h index a2602a8..e95d7ed 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -280,6 +280,8 @@ extern void scan_unevictable_unregister_node(struct node *node); extern int kswapd_run(int nid); extern void kswapd_stop(int nid); +unsigned long get_anon_scan_ratio(struct zone *zone, struct mem_cgroup *memcg, int swappiness); + #ifdef CONFIG_MMU /* linux/mm/shmem.c */ extern int shmem_unuse(swp_entry_t entry, struct page *page); diff --git a/mm/vmscan.c b/mm/vmscan.c index 640486b..1c39a74 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1572,6 +1572,21 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc, percent[1] = 100 - percent[0]; } +unsigned long get_anon_scan_ratio(struct zone *zone, struct mem_cgroup *memcg, int swappiness) +{ + unsigned long percent[2]; + struct scan_control sc = { + .may_swap = 1, + .swappiness = swappiness, + .mem_cgroup = memcg, + }; + + get_scan_ratio(zone, &sc, percent); + + return percent[0]; +} + + /* * Smallish @nr_to_scan's are deposited in @nr_saved_scan, * until we collected @swap_cluster_max pages to scan. diff --git a/mm/vmstat.c b/mm/vmstat.c index a5d45bc..24383b4 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -15,6 +15,7 @@ #include <linux/cpu.h> #include <linux/vmstat.h> #include <linux/sched.h> +#include <linux/swap.h> #ifdef CONFIG_VM_EVENT_COUNTERS DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; @@ -762,11 +763,13 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, "\n all_unreclaimable: %u" "\n prev_priority: %i" "\n start_pfn: %lu" - "\n inactive_ratio: %u", + "\n inactive_ratio: %u" + "\n anon_scan_ratio: %lu", zone_is_all_unreclaimable(zone), zone->prev_priority, zone->zone_start_pfn, - zone->inactive_ratio); + zone->inactive_ratio, + get_anon_scan_ratio(zone, NULL, vm_swappiness)); seq_putc(m, '\n'); } -- 1.6.5.2
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