[Xen-devel] [PATCH 3/9] blkio-cgroup-v9: The new page_cgroup framework

[Ryo Tsuruta <ryov@xxxxxxxxxxxxx>]

This patch makes the page_cgroup framework be able to be used even if
the compile option of the cgroup memory controller is off.
So blkio-cgroup can use this framework without the memory controller.

Signed-off-by: Hirokazu Takahashi <taka@xxxxxxxxxxxxx>
Signed-off-by: Ryo Tsuruta <ryov@xxxxxxxxxxxxx>

---
 include/linux/memcontrol.h  |    6 ++++++
 include/linux/mmzone.h      |    4 ++--
 include/linux/page_cgroup.h |    8 +++++---
 init/Kconfig                |    4 ++++
 mm/Makefile                 |    3 ++-
 mm/memcontrol.c             |    6 ++++++
 mm/page_cgroup.c            |    3 +--
 7 files changed, 26 insertions(+), 8 deletions(-)

Index: linux-2.6.31-rc3/include/linux/memcontrol.h
===================================================================
--- linux-2.6.31-rc3.orig/include/linux/memcontrol.h
+++ linux-2.6.31-rc3/include/linux/memcontrol.h
@@ -37,6 +37,8 @@ struct mm_struct;
  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  */
 
+extern void __init_mem_page_cgroup(struct page_cgroup *pc);
+
 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
                                gfp_t gfp_mask);
 /* for swap handling */
@@ -121,6 +123,10 @@ void mem_cgroup_update_mapped_file_stat(
 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 struct mem_cgroup;
 
+static inline void __init_mem_page_cgroup(struct page_cgroup *pc)
+{
+}
+
 static inline int mem_cgroup_newpage_charge(struct page *page,
                                        struct mm_struct *mm, gfp_t gfp_mask)
 {
Index: linux-2.6.31-rc3/include/linux/mmzone.h
===================================================================
--- linux-2.6.31-rc3.orig/include/linux/mmzone.h
+++ linux-2.6.31-rc3/include/linux/mmzone.h
@@ -605,7 +605,7 @@ typedef struct pglist_data {
        int nr_zones;
 #ifdef CONFIG_FLAT_NODE_MEM_MAP        /* means !SPARSEMEM */
        struct page *node_mem_map;
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#ifdef CONFIG_CGROUP_PAGE
        struct page_cgroup *node_page_cgroup;
 #endif
 #endif
@@ -956,7 +956,7 @@ struct mem_section {
 
        /* See declaration of similar field in struct zone */
        unsigned long *pageblock_flags;
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#ifdef CONFIG_CGROUP_PAGE
        /*
         * If !SPARSEMEM, pgdat doesn't have page_cgroup pointer. We use
         * section. (see memcontrol.h/page_cgroup.h about this.)
Index: linux-2.6.31-rc3/include/linux/page_cgroup.h
===================================================================
--- linux-2.6.31-rc3.orig/include/linux/page_cgroup.h
+++ linux-2.6.31-rc3/include/linux/page_cgroup.h
@@ -1,7 +1,7 @@
 #ifndef __LINUX_PAGE_CGROUP_H
 #define __LINUX_PAGE_CGROUP_H
 
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#ifdef CONFIG_CGROUP_PAGE
 #include <linux/bit_spinlock.h>
 /*
  * Page Cgroup can be considered as an extended mem_map.
@@ -12,9 +12,11 @@
  */
 struct page_cgroup {
        unsigned long flags;
-       struct mem_cgroup *mem_cgroup;
        struct page *page;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+       struct mem_cgroup *mem_cgroup;
        struct list_head lru;           /* per cgroup LRU list */
+#endif
 };
 
 void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
@@ -83,7 +85,7 @@ static inline void unlock_page_cgroup(st
        bit_spin_unlock(PCG_LOCK, &pc->flags);
 }
 
-#else /* CONFIG_CGROUP_MEM_RES_CTLR */
+#else /* CONFIG_CGROUP_PAGE */
 struct page_cgroup;
 
 static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
Index: linux-2.6.31-rc3/init/Kconfig
===================================================================
--- linux-2.6.31-rc3.orig/init/Kconfig
+++ linux-2.6.31-rc3/init/Kconfig
@@ -614,6 +614,10 @@ config CGROUP_MEM_RES_CTLR_SWAP
 
 endif # CGROUPS
 
+config CGROUP_PAGE
+       def_bool y
+       depends on CGROUP_MEM_RES_CTLR
+
 config MM_OWNER
        bool
 
Index: linux-2.6.31-rc3/mm/Makefile
===================================================================
--- linux-2.6.31-rc3.orig/mm/Makefile
+++ linux-2.6.31-rc3/mm/Makefile
@@ -39,6 +39,7 @@ else
 obj-$(CONFIG_SMP) += allocpercpu.o
 endif
 obj-$(CONFIG_QUICKLIST) += quicklist.o
-obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
+obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o
+obj-$(CONFIG_CGROUP_PAGE) += page_cgroup.o
 obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o
 obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o
Index: linux-2.6.31-rc3/mm/memcontrol.c
===================================================================
--- linux-2.6.31-rc3.orig/mm/memcontrol.c
+++ linux-2.6.31-rc3/mm/memcontrol.c
@@ -129,6 +129,12 @@ struct mem_cgroup_lru_info {
        struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES];
 };
 
+void __meminit __init_mem_page_cgroup(struct page_cgroup *pc)
+{
+       pc->mem_cgroup = NULL;
+       INIT_LIST_HEAD(&pc->lru);
+}
+
 /*
  * The memory controller data structure. The memory controller controls both
  * page cache and RSS per cgroup. We would eventually like to provide
Index: linux-2.6.31-rc3/mm/page_cgroup.c
===================================================================
--- linux-2.6.31-rc3.orig/mm/page_cgroup.c
+++ linux-2.6.31-rc3/mm/page_cgroup.c
@@ -14,9 +14,8 @@ static void __meminit
 __init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
 {
        pc->flags = 0;
-       pc->mem_cgroup = NULL;
        pc->page = pfn_to_page(pfn);
-       INIT_LIST_HEAD(&pc->lru);
+       __init_mem_page_cgroup(pc);
 }
 static unsigned long total_usage;
 

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