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page-allocator: reset wmark_min and inactive ratio of zone when hotplug happens 

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.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2009-06-16 15:32:50 -07:00 committed by Linus Torvalds
parent 96cb4df5dd
commit bce7394a3e
2 changed files with 5 additions and 1 deletions
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4
mm/memory_hotplug.c
View File

@ -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_wmarks();
calculate_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_wmarks();
calculate_zone_inactive_ratio(zone);
vm_total_pages = nr_free_pagecache_pages();
writeback_set_ratelimit();

2
mm/page_alloc.c
View File

@ -4397,7 +4397,7 @@ static void setup_per_zone_lowmem_reserve(void)
/**
* setup_per_zone_wmarks - called when min_free_kbytes changes
* or when memory is hot-added
* or when memory is hot-{added|removed}
*
* Ensures that the watermark[min,low,high] values for each zone are set
* correctly with respect to min_free_kbytes.