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[PATCH 4/5] mm: show node_pages_scanned per node, not zone

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  [PATCH 4/5] mm: show node_pages_scanned per node, not zone Mel Gorman <mgorman@techsingularity.net> - 2016-07-15 15:10 +0200
    Re: [PATCH 4/5] mm: show node_pages_scanned per node, not zone Minchan Kim <minchan@kernel.org> - 2016-07-16 12:20 +0200

#1444299 — [PATCH 4/5] mm: show node_pages_scanned per node, not zone

From: Minchan Kim <minchan@kernel.org>

The node_pages_scanned represents the number of scanned pages
of node for reclaim so it's pointless to show it as kilobytes.

As well, node_pages_scanned is per-node value, not per-zone.

This patch changes node_pages_scanned per-zone-killobytes
with per-node-count.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/page_alloc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f80a0e57dcc8..7edd311a63f1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4345,6 +4345,7 @@ void show_free_areas(unsigned int filter)
 #endif
 			" writeback_tmp:%lukB"
 			" unstable:%lukB"
+			" pages_scanned:%lu"
 			" all_unreclaimable? %s"
 			"\n",
 			pgdat->node_id,
@@ -4367,6 +4368,7 @@ void show_free_areas(unsigned int filter)
 			K(node_page_state(pgdat, NR_SHMEM)),
 			K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
 			K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
+			node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED),
 			!pgdat_reclaimable(pgdat) ? "yes" : "no");
 	}
 
@@ -4397,7 +4399,6 @@ void show_free_areas(unsigned int filter)
 			" free_pcp:%lukB"
 			" local_pcp:%ukB"
 			" free_cma:%lukB"
-			" node_pages_scanned:%lu"
 			"\n",
 			zone->name,
 			K(zone_page_state(zone, NR_FREE_PAGES)),
@@ -4415,8 +4416,7 @@ void show_free_areas(unsigned int filter)
 			K(zone_page_state(zone, NR_BOUNCE)),
 			K(free_pcp),
 			K(this_cpu_read(zone->pageset->pcp.count)),
-			K(zone_page_state(zone, NR_FREE_CMA_PAGES)),
-			K(node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED)));
+			K(zone_page_state(zone, NR_FREE_CMA_PAGES)));
 		printk("lowmem_reserve[]:");
 		for (i = 0; i < MAX_NR_ZONES; i++)
 			printk(" %ld", zone->lowmem_reserve[i]);
-- 
2.6.4

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#1444798

On Fri, Jul 15, 2016 at 02:09:24PM +0100, Mel Gorman wrote:
> From: Minchan Kim <minchan@kernel.org>
> 
> The node_pages_scanned represents the number of scanned pages
> of node for reclaim so it's pointless to show it as kilobytes.
> 
> As well, node_pages_scanned is per-node value, not per-zone.
> 
> This patch changes node_pages_scanned per-zone-killobytes
> with per-node-count.
> 
> Signed-off-by: Minchan Kim <minchan@kernel.org>
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
> ---
>  mm/page_alloc.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f80a0e57dcc8..7edd311a63f1 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4345,6 +4345,7 @@ void show_free_areas(unsigned int filter)
>  #endif
>  			" writeback_tmp:%lukB"
>  			" unstable:%lukB"
> +			" pages_scanned:%lu"
>  			" all_unreclaimable? %s"
>  			"\n",
>  			pgdat->node_id,
> @@ -4367,6 +4368,7 @@ void show_free_areas(unsigned int filter)
>  			K(node_page_state(pgdat, NR_SHMEM)),
>  			K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
>  			K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
> +			node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED),

Oops, It should be pgdat, not zone->zone_pgdat.
Andrew, please fold it.

From 0b058f64335764b82439a3c24fad8573cc1474d7 Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan@kernel.org>
Date: Sat, 16 Jul 2016 19:07:51 +0900
Subject: [PATCH] mm: fix node_pages_scanned

Use pgdat for node stat instead of zone->pgdat.

Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7edd311..7547b6b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4368,7 +4368,7 @@ void show_free_areas(unsigned int filter)
 			K(node_page_state(pgdat, NR_SHMEM)),
 			K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
 			K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
-			node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED),
+			node_page_state(pgdat, NR_PAGES_SCANNED),
 			!pgdat_reclaimable(pgdat) ? "yes" : "no");
 	}
 
-- 
1.9.1

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