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Subject[PATCH v2 4/5] page_alloc: Make movablecore_map has higher priority
Date
If kernelcore or movablecore is specified at the same time
with movablecore_map, movablecore_map will have higher
priority to be satisfied.
This patch will make find_zone_movable_pfns_for_nodes()
calculate zone_movable_pfn[] with the limit from
zone_movable_limit[].

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: Wen Congyang <wency@cn.fujitsu.com>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Tested-by: Lin Feng <linfeng@cn.fujitsu.com>
---
mm/page_alloc.c | 35 +++++++++++++++++++++++++++++++----
1 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f23d76a..05bafbb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4800,12 +4800,25 @@ static void __init find_zone_movable_pfns_for_nodes(void)
required_kernelcore = max(required_kernelcore, corepages);
}

- /* If kernelcore was not specified, there is no ZONE_MOVABLE */
- if (!required_kernelcore)
+ /*
+ * No matter kernelcore/movablecore was limited or not, movable_zone
+ * should always be set to a usable zone index.
+ */
+ find_usable_zone_for_movable();
+
+ /*
+ * If neither kernelcore/movablecore nor movablecore_map is specified,
+ * there is no ZONE_MOVABLE. But if movablecore_map is specified, the
+ * start pfn of ZONE_MOVABLE has been stored in zone_movable_limit[].
+ */
+ if (!required_kernelcore) {
+ if (movablecore_map.nr_map)
+ memcpy(zone_movable_pfn, zone_movable_limit,
+ sizeof(zone_movable_pfn));
goto out;
+ }

/* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */
- find_usable_zone_for_movable();
usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone];

restart:
@@ -4833,10 +4846,24 @@ restart:
for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
unsigned long size_pages;

+ /*
+ * Find more memory for kernelcore in
+ * [zone_movable_pfn[nid], zone_movable_limit[nid]).
+ */
start_pfn = max(start_pfn, zone_movable_pfn[nid]);
if (start_pfn >= end_pfn)
continue;

+ if (zone_movable_limit[nid]) {
+ end_pfn = min(end_pfn, zone_movable_limit[nid]);
+ /* No range left for kernelcore in this node */
+ if (start_pfn >= end_pfn) {
+ zone_movable_pfn[nid] =
+ zone_movable_limit[nid];
+ break;
+ }
+ }
+
/* Account for what is only usable for kernelcore */
if (start_pfn < usable_startpfn) {
unsigned long kernel_pages;
@@ -4896,12 +4923,12 @@ restart:
if (usable_nodes && required_kernelcore > usable_nodes)
goto restart;

+out:
/* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */
for (nid = 0; nid < MAX_NUMNODES; nid++)
zone_movable_pfn[nid] =
roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES);

-out:
/* restore the node_state */
node_states[N_HIGH_MEMORY] = saved_node_state;
}
--
1.7.1


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