[RFC PATCH 11/12] mm: add the PCP interface

[Xishi Qiu]

Add the PCP interface for address range mirroring feature.

Signed-off-by: Xishi Qiu <qiuxi...@huawei.com>
---
 mm/page_alloc.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0fb55288..cf3b7cb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1401,11 +1401,16 @@ static int rmqueue_bulk(struct zone *zone, unsigned int 
order,
                        unsigned long count, struct list_head *list,
                        int migratetype, bool cold)
 {
-       int i;
+       int i, mt;
 
        spin_lock(&zone->lock);
        for (i = 0; i < count; ++i) {
-               struct page *page = __rmqueue(zone, order, migratetype);
+               struct page *page;
+
+               if (is_migrate_mirror(migratetype))
+                       page = __rmqueue_smallest(zone, order, migratetype);
+               else
+                       page = __rmqueue(zone, order, migratetype);
                if (unlikely(page == NULL))
                        break;
 
@@ -1423,9 +1428,14 @@ static int rmqueue_bulk(struct zone *zone, unsigned int 
order,
                else
                        list_add_tail(&page->lru, list);
                list = &page->lru;
-               if (is_migrate_cma(get_freepage_migratetype(page)))
+
+               mt = get_freepage_migratetype(page);
+               if (is_migrate_cma(mt))
                        __mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
                                              -(1 << order));
+               if (is_migrate_mirror(mt))
+                       __mod_zone_page_state(zone, NR_FREE_MIRROR_PAGES,
+                                             -(1 << order));
        }
        __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order));
        spin_unlock(&zone->lock);
-- 
2.0.0


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