x86, numa, acpi, memory-hotplug: make movable_node have higher priority

If users specify the original movablecore=nn@ss boot option, the kernel
will arrange [ss, ss+nn) as ZONE_MOVABLE.  The kernelcore=nn@ss boot
option is similar except it specifies ZONE_NORMAL ranges.

Now, if users specify "movable_node" in kernel commandline, the kernel
will arrange hotpluggable memory in SRAT as ZONE_MOVABLE.  And if users
do this, all the other movablecore=nn@ss and kernelcore=nn@ss options
should be ignored.

For those who don't want this, just specify nothing.  The kernel will
act as before.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Rafael J . Wysocki" <rjw@sisk.pl>
Cc: Chen Tang <imtangchen@gmail.com>
Cc: Gong Chen <gong.chen@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Liu Jiang <jiang.liu@huawei.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Taku Izumi <izumi.taku@jp.fujitsu.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 26 insertions, 2 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ec4417cb458a..4f59d1986018 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5018,9 +5018,33 @@ static void __init find_zone_movable_pfns_for_nodes(void)
         nodemask_t saved_node_state = node_states[N_MEMORY];
         unsigned long totalpages = early_calculate_totalpages();
         int usable_nodes = nodes_weight(node_states[N_MEMORY]);
+        struct memblock_type *type = &memblock.memory;
+
+        /* Need to find movable_zone earlier when movable_node is specified. */
+        find_usable_zone_for_movable();
+
+        /*
+         * If movable_node is specified, ignore kernelcore and movablecore
+         * options.
+         */
+        if (movable_node_is_enabled()) {
+                for (i = 0; i < type->cnt; i++) {
+                        if (!memblock_is_hotpluggable(&type->regions[i]))
+                                continue;
+
+                        nid = type->regions[i].nid;
+
+                        usable_startpfn = PFN_DOWN(type->regions[i].base);
+                        zone_movable_pfn[nid] = zone_movable_pfn[nid] ?
+                                min(usable_startpfn, zone_movable_pfn[nid]) :
+                                usable_startpfn;
+                }
+
+                goto out2;
+        }
 
         /*
-         * If movablecore was specified, calculate what size of
+         * If movablecore=nn[KMG] was specified, calculate what size of
          * kernelcore that corresponds so that memory usable for
          * any allocation type is evenly spread. If both kernelcore
          * and movablecore are specified, then the value of kernelcore
@@ -5046,7 +5070,6 @@ static void __init find_zone_movable_pfns_for_nodes(void)
                 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:
@@ -5137,6 +5160,7 @@ restart:
         if (usable_nodes && required_kernelcore > usable_nodes)
                 goto restart;
 
+out2:
         /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */
         for (nid = 0; nid < MAX_NUMNODES; nid++)
                 zone_movable_pfn[nid] =