linux-kernel - [PATCH 3/3] reset wmark_min and inactive ratio of zone when hotplug happens

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Date:	Wed, 20 May 2009 16:20:01 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Cc:	Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH 3/3] reset wmark_min and inactive ratio of zone when hotplug
 happens

This patch solve two problems.

Whenever memory hotplug sucessfully happens, zone->present_pages
have to be changed.

1) Now, memory hotplug calls setup_per_zone_wmark_min only when
online_pages called, not offline_pages.

It breaks balance.

2) If zone->present_pages is changed, we also have to change
zone->inactive_ratio. That's because inactive_ratio depends
on zone->present_pages.

CC: Mel Gorman <mel@....ul.ie>
CC: Rik van Riel <riel@...hat.com>
CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 mm/memory_hotplug.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 40bf385..1611010 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -423,6 +423,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
 	zone->zone_pgdat->node_present_pages += onlined_pages;
 
 	setup_per_zone_wmark_min();
+	calculate_per_zone_inactive_ratio(zone);
 	if (onlined_pages) {
 		kswapd_run(zone_to_nid(zone));
 		node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
@@ -832,6 +833,9 @@ repeat:
 	totalram_pages -= offlined_pages;
 	num_physpages -= offlined_pages;
 
+	setup_per_zone_wmark_min();
+	calculate_per_zone_inactive_ratio(zone);
+
 	vm_total_pages = nr_free_pagecache_pages();
 	writeback_set_ratelimit();
 
-- 
1.5.4.3



-- 
Kinds Regards
Minchan Kim
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