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mm,memory_hotplug: factor out adjusting present pages into adjust_present_page_count() 

Let's have a single place (inspired by adjust_managed_page_count())
where we adjust present pages.

In contrast to adjust_managed_page_count(), only memory onlining or
offlining is allowed to modify the number of present pages.

Link: https://lkml.kernel.org/r/20210421102701.25051-4-osalvador@suse.de
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2021-05-04 18:39:39 -07:00 committed by Linus Torvalds
parent dd8e2f230d
commit f9901144e4
1 changed files with 12 additions and 10 deletions
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22
mm/memory_hotplug.c
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@ -829,6 +829,16 @@ struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
return default_zone_for_pfn(nid, start_pfn, nr_pages);
}
static void adjust_present_page_count(struct zone *zone, long nr_pages)
{
unsigned long flags;
zone->present_pages += nr_pages;
pgdat_resize_lock(zone->zone_pgdat, &flags);
zone->zone_pgdat->node_present_pages += nr_pages;
pgdat_resize_unlock(zone->zone_pgdat, &flags);
}
int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
int online_type, int nid)
{
@ -884,11 +894,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
}
online_pages_range(pfn, nr_pages);
zone->present_pages += nr_pages;
pgdat_resize_lock(zone->zone_pgdat, &flags);
zone->zone_pgdat->node_present_pages += nr_pages;
pgdat_resize_unlock(zone->zone_pgdat, &flags);
adjust_present_page_count(zone, nr_pages);
node_states_set_node(nid, &arg);
if (need_zonelists_rebuild)
@ -1706,11 +1712,7 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
/* removal success */
adjust_managed_page_count(pfn_to_page(start_pfn), -nr_pages);
zone->present_pages -= nr_pages;
pgdat_resize_lock(zone->zone_pgdat, &flags);
zone->zone_pgdat->node_present_pages -= nr_pages;
pgdat_resize_unlock(zone->zone_pgdat, &flags);
adjust_present_page_count(zone, -nr_pages);
init_per_zone_wmark_min();