linux-kernel - [PATCH] mm: simplify node/zone name printing

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Message-Id: <20161216123232.26307-1-mhocko@kernel.org>
Date:   Fri, 16 Dec 2016 13:32:32 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Joonsoo Kim <js1304@...il.com>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH] mm: simplify node/zone name printing

From: Michal Hocko <mhocko@...e.com>

show_node currently only prints Node id while it is always followed by
printing zone->name. As the node information is conditional to
CONFIG_NUMA we have to be careful to always terminate the previous
continuation line before printing the zone name. This is quite ugly
and easy to mess up. Let's rename show_node to show_zone_node and
make sure that it will always start at a new line. We can drop the ugly
printk(KERN_CONT "\n") from show_free_areas.

Signed-off-by: Michal Hocko <mhocko@...e.com>
---
Hi,
this has been sitting in my tree since oct and I completely forgot about
it. Does this look like a reasonable clean up to you?

 mm/page_alloc.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3f2c9e535f7f..5324efa8b9d0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4120,10 +4120,12 @@ unsigned long nr_free_pagecache_pages(void)
 	return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE));
 }
 
-static inline void show_node(struct zone *zone)
+static inline void show_zone_node(struct zone *zone)
 {
 	if (IS_ENABLED(CONFIG_NUMA))
-		printk("Node %d ", zone_to_nid(zone));
+		printk("Node %d %s", zone_to_nid(zone), zone->name);
+	else
+		printk("%s: ", zone->name);
 }
 
 long si_mem_available(void)
@@ -4371,9 +4373,8 @@ void show_free_areas(unsigned int filter)
 		for_each_online_cpu(cpu)
 			free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count;
 
-		show_node(zone);
+		show_zone_node(zone);
 		printk(KERN_CONT
-			"%s"
 			" free:%lukB"
 			" min:%lukB"
 			" low:%lukB"
@@ -4396,7 +4397,6 @@ void show_free_areas(unsigned int filter)
 			" local_pcp:%ukB"
 			" free_cma:%lukB"
 			"\n",
-			zone->name,
 			K(zone_page_state(zone, NR_FREE_PAGES)),
 			K(min_wmark_pages(zone)),
 			K(low_wmark_pages(zone)),
@@ -4421,7 +4421,6 @@ void show_free_areas(unsigned int filter)
 		printk("lowmem_reserve[]:");
 		for (i = 0; i < MAX_NR_ZONES; i++)
 			printk(KERN_CONT " %ld", zone->lowmem_reserve[i]);
-		printk(KERN_CONT "\n");
 	}
 
 	for_each_populated_zone(zone) {
@@ -4431,8 +4430,7 @@ void show_free_areas(unsigned int filter)
 
 		if (skip_free_areas_node(filter, zone_to_nid(zone)))
 			continue;
-		show_node(zone);
-		printk(KERN_CONT "%s: ", zone->name);
+		show_zone_node(zone);
 
 		spin_lock_irqsave(&zone->lock, flags);
 		for (order = 0; order < MAX_ORDER; order++) {
-- 
2.10.2