[RFC PATCH 03/12] mm: introduce MIGRATE_MIRROR to manage the mirrored, pages

[Xishi Qiu <qiuxishi@huawei.com>]

This patch introduces a new MIGRATE_TYPES called "MIGRATE_MIRROR", it is used
to storage the mirrored pages list.
When cat /proc/pagetypeinfo, you can see the count of free mirrored blocks.

e.g.
euler-linux:~ # cat /proc/pagetypeinfo
Page block order: 9
Pages per block:  512

Free pages count per migrate type at order       0      1      2      3      4      5      6      7      8      9     10
Node    0, zone      DMA, type    Unmovable      1      1      0      0      2      1      1      0      1      0      0
Node    0, zone      DMA, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone      DMA, type      Movable      0      0      0      0      0      0      0      0      0      0      3
Node    0, zone      DMA, type       Mirror      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone      DMA, type      Reserve      0      0      0      0      0      0      0      0      0      1      0
Node    0, zone      DMA, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone    DMA32, type    Unmovable      0      0      1      0      0      0      0      1      1      1      0
Node    0, zone    DMA32, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone    DMA32, type      Movable      1      2      6      6      6      4      5      3      3      2    738
Node    0, zone    DMA32, type       Mirror      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone    DMA32, type      Reserve      0      0      0      0      0      0      0      0      0      0      1
Node    0, zone    DMA32, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone   Normal, type    Unmovable      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone   Normal, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone   Normal, type      Movable      0      0      1      1      0      0      0      2      1      0   4254
Node    0, zone   Normal, type       Mirror    148    104     63     70     26     11      2      2      1      1    973
Node    0, zone   Normal, type      Reserve      0      0      0      0      0      0      0      0      0      0      1
Node    0, zone   Normal, type      Isolate      0      0      0      0      0      0      0      0      0      0      0

Number of blocks type     Unmovable  Reclaimable      Movable       Mirror      Reserve      Isolate
Node 0, zone      DMA            1            0            6            0            1            0
Node 0, zone    DMA32            2            0         1525            0            1            0
Node 0, zone   Normal            0            0         8702         2048            2            0
Page block order: 9
Pages per block:  512

Free pages count per migrate type at order       0      1      2      3      4      5      6      7      8      9     10
Node    1, zone   Normal, type    Unmovable      0      0      0      0      0      0      0      0      0      0      0
Node    1, zone   Normal, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
Node    1, zone   Normal, type      Movable      2      2      1      1      2      1      2      2      2      3   3996
Node    1, zone   Normal, type       Mirror     68     94     57      6      8      1      0      0      3      1   2003
Node    1, zone   Normal, type      Reserve      0      0      0      0      0      0      0      0      0      0      1
Node    1, zone   Normal, type      Isolate      0      0      0      0      0      0      0      0      0      0      0

Number of blocks type     Unmovable  Reclaimable      Movable       Mirror      Reserve      Isolate
Node 1, zone   Normal            0            0         8190         4096            2            0


Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
---
 include/linux/mmzone.h | 6 ++++++
 mm/page_alloc.c        | 3 +++
 mm/vmstat.c            | 3 +++
 3 files changed, 12 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 1fae07b..b444335 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -39,6 +39,9 @@ enum {
 	MIGRATE_UNMOVABLE,
 	MIGRATE_RECLAIMABLE,
 	MIGRATE_MOVABLE,
+#ifdef CONFIG_MEMORY_MIRROR
+	MIGRATE_MIRROR,
+#endif
 	MIGRATE_PCPTYPES,	/* the number of types on the pcp lists */
 	MIGRATE_RESERVE = MIGRATE_PCPTYPES,
 #ifdef CONFIG_CMA
@@ -82,6 +85,9 @@ struct mirror_info {
 };
 
 extern struct mirror_info mirror_info;
+#  define is_migrate_mirror(migratetype) unlikely((migratetype) == MIGRATE_MIRROR)
+#else
+#  define is_migrate_mirror(migratetype) false
 #endif
 
 #define for_each_migratetype_order(order, type) \
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 41a95a7..3b2ff46 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3245,6 +3245,9 @@ static void show_migration_types(unsigned char type)
 		[MIGRATE_UNMOVABLE]	= 'U',
 		[MIGRATE_RECLAIMABLE]	= 'E',
 		[MIGRATE_MOVABLE]	= 'M',
+#ifdef CONFIG_MEMORY_MIRROR
+		[MIGRATE_MIRROR]	= 'O',
+#endif
 		[MIGRATE_RESERVE]	= 'R',
 #ifdef CONFIG_CMA
 		[MIGRATE_CMA]		= 'C',
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 4f5cd97..d0323e0 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -901,6 +901,9 @@ static char * const migratetype_names[MIGRATE_TYPES] = {
 	"Unmovable",
 	"Reclaimable",
 	"Movable",
+#ifdef CONFIG_MEMORY_MIRROR
+	"Mirror",
+#endif
 	"Reserve",
 #ifdef CONFIG_CMA
 	"CMA",
-- 
2.0.0


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