page_alloc: make movablemem_map have higher priority

If kernelcore or movablecore is specified at the same time with
movablemem_map, movablemem_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>
Cc: Wu Jianguo <wujianguo@huawei.com>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Tested-by: Lin Feng <linfeng@cn.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 25 insertions, 3 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0f267d9c73ff..88b9962c99b3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4905,9 +4905,17 @@ 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)
+        /*
+         * If neither kernelcore/movablecore nor movablemem_map is specified,
+         * there is no ZONE_MOVABLE. But if movablemem_map is specified, the
+         * start pfn of ZONE_MOVABLE has been stored in zone_movable_limit[].
+         */
+        if (!required_kernelcore) {
+                if (movablemem_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 */
         usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone];
@@ -4937,10 +4945,24 @@ 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;
@@ -5000,12 +5022,12 @@ 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_MEMORY] = saved_node_state;
 }