From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
x86@kernel.org, David Hildenbrand <david@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Oscar Salvador <osalvador@suse.de>,
Michal Hocko <mhocko@suse.com>,
Pavel Tatashin <pasha.tatashin@soleen.com>,
Dan Williams <dan.j.williams@intel.com>,
Wei Yang <richardw.yang@linux.intel.com>
Subject: [PATCH v6 08/10] mm/memory_hotplug: Don't check for "all holes" in shrink_zone_span()
Date: Sun, 6 Oct 2019 10:56:44 +0200 [thread overview]
Message-ID: <20191006085646.5768-9-david@redhat.com> (raw)
In-Reply-To: <20191006085646.5768-1-david@redhat.com>
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.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
mm/memory_hotplug.c | 34 +++++++---------------------------
1 file changed, 7 insertions(+), 27 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index f294918f7211..8dafa1ba8d9f 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -393,6 +393,9 @@ 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) {
/*
@@ -405,34 +408,11 @@ 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);
}
--
2.21.0
next prev parent reply other threads:[~2019-10-06 8:57 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-06 8:56 [PATCH v6 00/10] mm/memory_hotplug: Shrink zones before removing memory David Hildenbrand
2019-10-06 8:56 ` [PATCH v6 01/10] mm/memunmap: Don't access uninitialized memmap in memunmap_pages() David Hildenbrand
2019-10-06 19:58 ` Damian Tometzki
2019-10-06 20:13 ` David Hildenbrand
2019-10-14 9:05 ` David Hildenbrand
2019-10-06 8:56 ` [PATCH v6 02/10] mm/memmap_init: Update variable name in memmap_init_zone David Hildenbrand
2019-10-06 8:56 ` [PATCH v6 03/10] mm/memory_hotplug: Don't access uninitialized memmaps in shrink_pgdat_span() David Hildenbrand
2019-10-14 9:31 ` David Hildenbrand
2019-10-06 8:56 ` [PATCH v6 04/10] mm/memory_hotplug: Don't access uninitialized memmaps in shrink_zone_span() David Hildenbrand
2019-10-14 9:32 ` David Hildenbrand
2019-10-14 19:17 ` Andrew Morton
2019-11-19 14:16 ` David Hildenbrand
2019-11-19 20:44 ` Andrew Morton
2019-10-06 8:56 ` [PATCH v6 05/10] mm/memory_hotplug: Shrink zones when offlining memory David Hildenbrand
2019-10-14 9:39 ` David Hildenbrand
2019-10-14 19:16 ` Andrew Morton
2019-10-27 22:45 ` David Hildenbrand
2019-11-30 23:21 ` Andrew Morton
2019-11-30 23:43 ` David Hildenbrand
2019-12-18 17:08 ` David Hildenbrand
2019-12-18 20:16 ` Andrew Morton
2019-12-03 15:10 ` Oscar Salvador
2019-12-03 15:27 ` David Hildenbrand
2019-10-06 8:56 ` [PATCH v6 06/10] mm/memory_hotplug: Poison memmap in remove_pfn_range_from_zone() David Hildenbrand
2019-10-16 14:01 ` David Hildenbrand
2020-02-04 8:59 ` Oscar Salvador
2019-10-06 8:56 ` [PATCH v6 07/10] mm/memory_hotplug: We always have a zone in find_(smallest|biggest)_section_pfn David Hildenbrand
2020-02-04 9:06 ` Oscar Salvador
2020-02-05 8:57 ` Wei Yang
2020-02-05 8:59 ` David Hildenbrand
2020-02-05 9:26 ` Wei Yang
2019-10-06 8:56 ` David Hildenbrand [this message]
2020-02-04 9:13 ` [PATCH v6 08/10] mm/memory_hotplug: Don't check for "all holes" in shrink_zone_span() Oscar Salvador
2020-02-04 9:20 ` David Hildenbrand
2020-02-04 14:25 ` Baoquan He
2020-02-04 14:42 ` David Hildenbrand
2020-02-05 12:43 ` Baoquan He
2020-02-05 13:20 ` David Hildenbrand
2020-02-05 13:34 ` Baoquan He
2020-02-05 13:38 ` David Hildenbrand
2020-02-05 14:12 ` Baoquan He
2020-02-05 14:16 ` David Hildenbrand
2020-02-05 14:26 ` Baoquan He
2020-02-05 9:59 ` Wei Yang
2020-02-05 14:48 ` Baoquan He
2020-02-05 22:56 ` Wei Yang
2020-02-05 23:08 ` Baoquan He
2020-02-05 23:26 ` Wei Yang
2020-02-05 23:30 ` Baoquan He
2020-02-05 23:34 ` Wei Yang
2020-02-05 14:54 ` David Laight
2020-02-05 14:55 ` David Hildenbrand
2019-10-06 8:56 ` [PATCH v6 09/10] mm/memory_hotplug: Drop local variables " David Hildenbrand
2020-02-04 9:26 ` Oscar Salvador
2020-02-04 9:29 ` David Hildenbrand
2020-02-05 10:07 ` Wei Yang
2019-10-06 8:56 ` [PATCH v6 10/10] mm/memory_hotplug: Cleanup __remove_pages() David Hildenbrand
2020-02-04 9:46 ` Oscar Salvador
2020-02-04 12:41 ` David Hildenbrand
2020-02-04 13:13 ` Segher Boessenkool
2020-02-04 13:38 ` David Hildenbrand
2020-02-05 12:51 ` Segher Boessenkool
2020-02-05 13:17 ` David Hildenbrand
2020-02-05 13:18 ` David Hildenbrand
2020-02-05 13:23 ` David Hildenbrand
2020-02-05 11:48 ` Wei Yang
2019-12-02 9:09 ` [PATCH v6 00/10] mm/memory_hotplug: Shrink zones before removing memory David Hildenbrand
2019-12-03 13:36 ` Oscar Salvador
2020-01-31 4:40 ` Andrew Morton
2020-01-31 9:18 ` David Hildenbrand
2020-01-31 10:03 ` Michal Hocko
2020-01-31 10:36 ` David Hildenbrand
2020-02-04 1:46 ` Andrew Morton
2020-02-04 8:45 ` David Hildenbrand
2020-02-04 9:51 ` Oscar Salvador
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