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authorDavid Hildenbrand <david@redhat.com>2020-02-04 04:34:16 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-04 06:05:23 +0300
commit950b68d9178b6209e92461ec371eee81f0f20190 (patch)
tree05f52485413186a44fb8dcfae5876b33c0dc17a6
parent9b05158f5d805e0cf373f6e5a43efb9306bcb6a2 (diff)
downloadlinux-950b68d9178b6209e92461ec371eee81f0f20190.tar.xz
mm/memory_hotplug: don't check for "all holes" in shrink_zone_span()
If we have holes, the holes will automatically get detected and removed once we remove the next bigger/smaller section. The extra checks can go. Link: http://lkml.kernel.org/r/20191006085646.5768-9-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Logan Gunthorpe <logang@deltatee.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Pankaj Gupta <pagupta@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memory_hotplug.c34
1 files changed, 7 insertions, 27 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 77cb164a2d96..61bd62d15fff 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -411,6 +411,9 @@ static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
if (pfn) {
zone->zone_start_pfn = pfn;
zone->spanned_pages = zone_end_pfn - pfn;
+ } else {
+ zone->zone_start_pfn = 0;
+ zone->spanned_pages = 0;
}
} else if (zone_end_pfn == end_pfn) {
/*
@@ -423,34 +426,11 @@ static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
start_pfn);
if (pfn)
zone->spanned_pages = pfn - zone_start_pfn + 1;
+ else {
+ zone->zone_start_pfn = 0;
+ zone->spanned_pages = 0;
+ }
}
-
- /*
- * The section is not biggest or smallest mem_section in the zone, it
- * only creates a hole in the zone. So in this case, we need not
- * change the zone. But perhaps, the zone has only hole data. Thus
- * it check the zone has only hole or not.
- */
- pfn = zone_start_pfn;
- for (; pfn < zone_end_pfn; pfn += PAGES_PER_SUBSECTION) {
- if (unlikely(!pfn_to_online_page(pfn)))
- continue;
-
- if (page_zone(pfn_to_page(pfn)) != zone)
- continue;
-
- /* Skip range to be removed */
- if (pfn >= start_pfn && pfn < end_pfn)
- continue;
-
- /* If we find valid section, we have nothing to do */
- zone_span_writeunlock(zone);
- return;
- }
-
- /* The zone has no valid section */
- zone->zone_start_pfn = 0;
- zone->spanned_pages = 0;
zone_span_writeunlock(zone);
}