[RFC PATCH 12/12] mm: let slab/slub/slob use mirrored memory

[Xishi Qiu <qiuxishi@huawei.com>]

Add __GFP_MIRROR flag when allocate a new slab.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
---
 mm/slab.c | 3 ++-
 mm/slob.c | 2 +-
 mm/slub.c | 2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 7eb38dd..3b3ef22 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1594,7 +1594,8 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
 	if (memcg_charge_slab(cachep, flags, cachep->gfporder))
 		return NULL;
 
-	page = alloc_pages_exact_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder);
+	page = alloc_pages_exact_node(nodeid, flags | __GFP_NOTRACK | __GFP_MIRROR,
+					cachep->gfporder);
 	if (!page) {
 		memcg_uncharge_slab(cachep, cachep->gfporder);
 		slab_out_of_memory(cachep, flags, nodeid);
diff --git a/mm/slob.c b/mm/slob.c
index 4765f65..4ff9bde 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -452,7 +452,7 @@ __do_kmalloc_node(size_t size, gfp_t gfp, int node, unsigned long caller)
 
 		if (likely(order))
 			gfp |= __GFP_COMP;
-		ret = slob_new_pages(gfp, order, node);
+		ret = slob_new_pages(gfp | __GFP_MIRROR, order, node);
 
 		trace_kmalloc_node(caller, ret,
 				   size, PAGE_SIZE << order, gfp, node);
diff --git a/mm/slub.c b/mm/slub.c
index 54c0876..1219e33 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1315,7 +1315,7 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s,
 	struct page *page;
 	int order = oo_order(oo);
 
-	flags |= __GFP_NOTRACK;
+	flags |= __GFP_NOTRACK | __GFP_MIRROR;
 
 	if (memcg_charge_slab(s, flags, order))
 		return NULL;
-- 
2.0.0