The patch titled
Subject: mm: fix a regression with HIGHMEM
has been removed from the -mm tree. Its filename was
mm-fix-a-regression-with-highmem-introduced-by-changeset-7f1290f2f2a4d.patch
This patch was dropped because an alternative patch was merged
------------------------------------------------------
From: Jiang Liu <jiang.liu@xxxxxxxxxx>
Subject: mm: fix a regression with HIGHMEM
Changeset 7f1290f2f2 ("mm: fix-up zone present pages") tried to fix a
issue when calculating zone->present_pages, but it causes a regression to
32bit systems with HIGHMEM. With that changeset,
reset_zone_present_pages() resets all zone->present_pages to zero, and
fixup_zone_present_pages() is called to recalculate zone->present_pages
when the boot allocator frees core memory pages into the buddy allocator.
Because highmem pages are not freed by bootmem allocator, all highmem
zones' present_pages becomes zero.
Actually there's no need to recalculate present_pages for the highmem zone
because the bootmem allocator never allocates pages from it. So fix the
regression by skipping highmem in function reset_zone_present_pages() and
fixup_zone_present_pages().
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
Signed-off-by: Jianguo Wu <wujianguo@xxxxxxxxxx>
Reported-by: Maciej Rutecki <maciej.rutecki@xxxxxxxxx>
Tested-by: Maciej Rutecki <maciej.rutecki@xxxxxxxxx>
Tested-by: Chris Clayton <chris2553@xxxxxxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff -puN mm/page_alloc.c~mm-fix-a-regression-with-highmem-introduced-by-changeset-7f1290f2f2a4d mm/page_alloc.c
--- a/mm/page_alloc.c~mm-fix-a-regression-with-highmem-introduced-by-changeset-7f1290f2f2a4d
+++ a/mm/page_alloc.c
@@ -6108,7 +6108,8 @@ void reset_zone_present_pages(void)
for_each_node_state(nid, N_HIGH_MEMORY) {
for (i = 0; i < MAX_NR_ZONES; i++) {
z = NODE_DATA(nid)->node_zones + i;
- z->present_pages = 0;
+ if (!is_highmem(z))
+ z->present_pages = 0;
}
}
}
@@ -6123,10 +6124,11 @@ void fixup_zone_present_pages(int nid, u
for (i = 0; i < MAX_NR_ZONES; i++) {
z = NODE_DATA(nid)->node_zones + i;
+ if (is_highmem(z))
+ continue;
+
zone_start_pfn = z->zone_start_pfn;
zone_end_pfn = zone_start_pfn + z->spanned_pages;
-
- /* if the two regions intersect */
if (!(zone_start_pfn >= end_pfn || zone_end_pfn <= start_pfn))
z->present_pages += min(end_pfn, zone_end_pfn) -
max(start_pfn, zone_start_pfn);
_
Patches currently in -mm which might be from jiang.liu@xxxxxxxxxx are
linux-next.patch
revert-mm-fix-up-zone-present-pages.patch
memory_hotplug-fix-possible-incorrect-node_states.patch
slub-hotplug-ignore-unrelated-nodes-hot-adding-and-hot-removing.patch
mm-memory-hotplug-dynamic-configure-movable-memory-and-portion-memory.patch
memory_hotplug-handle-empty-zone-when-online_movable-online_kernel.patch
memory_hotplug-ensure-every-online-node-has-normal-memory.patch
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