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Commit 52d4b9ac authored by KAMEZAWA Hiroyuki's avatar KAMEZAWA Hiroyuki Committed by Linus Torvalds
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memcg: allocate all page_cgroup at boot 



Allocate all page_cgroup at boot and remove page_cgroup poitner from
struct page.  This patch adds an interface as

 struct page_cgroup *lookup_page_cgroup(struct page*)

All FLATMEM/DISCONTIGMEM/SPARSEMEM  and MEMORY_HOTPLUG is supported.

Remove page_cgroup pointer reduces the amount of memory by
 - 4 bytes per PAGE_SIZE.
 - 8 bytes per PAGE_SIZE
if memory controller is disabled. (even if configured.)

On usual 8GB x86-32 server, this saves 8MB of NORMAL_ZONE memory.
On my x86-64 server with 48GB of memory, this saves 96MB of memory.
I think this reduction makes sense.

By pre-allocation, kmalloc/kfree in charge/uncharge are removed.
This means
  - we're not necessary to be afraid of kmalloc faiulre.
    (this can happen because of gfp_mask type.)
  - we can avoid calling kmalloc/kfree.
  - we can avoid allocating tons of small objects which can be fragmented.
  - we can know what amount of memory will be used for this extra-lru handling.

I added printk message as

	"allocated %ld bytes of page_cgroup"
        "please try cgroup_disable=memory option if you don't want"

maybe enough informative for users.

Signed-off-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: default avatarBalbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c05555b5

include/linux/memcontrol.h

+1 −12
Original line number Diff line number Diff line
@@ -27,9 +27,6 @@ struct mm_struct; 


#ifdef CONFIG_CGROUP_MEM_RES_CTLR



#define page_reset_bad_cgroup(page)	((page)->page_cgroup = 0)



extern struct page_cgroup *page_get_page_cgroup(struct page *page);

extern int mem_cgroup_charge(struct page *page, struct mm_struct *mm,

				gfp_t gfp_mask);

extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
@@ -72,16 +69,8 @@ extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 
extern long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone,

					int priority, enum lru_list lru);



#else /* CONFIG_CGROUP_MEM_RES_CTLR */

static inline void page_reset_bad_cgroup(struct page *page)

{

}



static inline struct page_cgroup *page_get_page_cgroup(struct page *page)

{

	return NULL;

}



#else /* CONFIG_CGROUP_MEM_RES_CTLR */

static inline int mem_cgroup_charge(struct page *page,

					struct mm_struct *mm, gfp_t gfp_mask)

{

include/linux/mm_types.h

+0 −3
Original line number Diff line number Diff line
@@ -94,9 +94,6 @@ struct page { 
	void *virtual;			/* Kernel virtual address (NULL if

					   not kmapped, ie. highmem) */

#endif /* WANT_PAGE_VIRTUAL */

#ifdef CONFIG_CGROUP_MEM_RES_CTLR

	unsigned long page_cgroup;

#endif

};



/*

include/linux/mmzone.h

+13 −1
Original line number Diff line number Diff line
@@ -601,8 +601,11 @@ typedef struct pglist_data { 
	struct zone node_zones[MAX_NR_ZONES];

	struct zonelist node_zonelists[MAX_ZONELISTS];

	int nr_zones;

#ifdef CONFIG_FLAT_NODE_MEM_MAP

#ifdef CONFIG_FLAT_NODE_MEM_MAP	/* means !SPARSEMEM */

	struct page *node_mem_map;

#ifdef CONFIG_CGROUP_MEM_RES_CTLR

	struct page_cgroup *node_page_cgroup;

#endif

#endif

	struct bootmem_data *bdata;

#ifdef CONFIG_MEMORY_HOTPLUG
@@ -931,6 +934,7 @@ static inline unsigned long early_pfn_to_nid(unsigned long pfn) 
#endif



struct page;

struct page_cgroup;

struct mem_section {

	/*

	 * This is, logically, a pointer to an array of struct
@@ -948,6 +952,14 @@ struct mem_section { 


	/* See declaration of similar field in struct zone */

	unsigned long *pageblock_flags;

#ifdef CONFIG_CGROUP_MEM_RES_CTLR

	/*

	 * If !SPARSEMEM, pgdat doesn't have page_cgroup pointer. We use

	 * section. (see memcontrol.h/page_cgroup.h about this.)

	 */

	struct page_cgroup *page_cgroup;

	unsigned long pad;

#endif

};



#ifdef CONFIG_SPARSEMEM_EXTREME

include/linux/page_cgroup.h

0 → 100644
+103 −0
Original line number Diff line number Diff line 
#ifndef __LINUX_PAGE_CGROUP_H

#define __LINUX_PAGE_CGROUP_H



#ifdef CONFIG_CGROUP_MEM_RES_CTLR

#include <linux/bit_spinlock.h>

/*

 * Page Cgroup can be considered as an extended mem_map.

 * A page_cgroup page is associated with every page descriptor. The

 * page_cgroup helps us identify information about the cgroup

 * All page cgroups are allocated at boot or memory hotplug event,

 * then the page cgroup for pfn always exists.

 */

struct page_cgroup {

	unsigned long flags;

	struct mem_cgroup *mem_cgroup;

	struct page *page;

	struct list_head lru;		/* per cgroup LRU list */

};



void __init pgdat_page_cgroup_init(struct pglist_data *pgdat);

void __init page_cgroup_init(void);

struct page_cgroup *lookup_page_cgroup(struct page *page);



enum {

	/* flags for mem_cgroup */

	PCG_LOCK,  /* page cgroup is locked */

	PCG_CACHE, /* charged as cache */

	PCG_USED, /* this object is in use. */

	/* flags for LRU placement */

	PCG_ACTIVE, /* page is active in this cgroup */

	PCG_FILE, /* page is file system backed */

	PCG_UNEVICTABLE, /* page is unevictableable */

};



#define TESTPCGFLAG(uname, lname)			\

static inline int PageCgroup##uname(struct page_cgroup *pc)	\

	{ return test_bit(PCG_##lname, &pc->flags); }



#define SETPCGFLAG(uname, lname)			\

static inline void SetPageCgroup##uname(struct page_cgroup *pc)\

	{ set_bit(PCG_##lname, &pc->flags);  }



#define CLEARPCGFLAG(uname, lname)			\

static inline void ClearPageCgroup##uname(struct page_cgroup *pc)	\

	{ clear_bit(PCG_##lname, &pc->flags);  }



/* Cache flag is set only once (at allocation) */

TESTPCGFLAG(Cache, CACHE)



TESTPCGFLAG(Used, USED)

CLEARPCGFLAG(Used, USED)



/* LRU management flags (from global-lru definition) */

TESTPCGFLAG(File, FILE)

SETPCGFLAG(File, FILE)

CLEARPCGFLAG(File, FILE)



TESTPCGFLAG(Active, ACTIVE)

SETPCGFLAG(Active, ACTIVE)

CLEARPCGFLAG(Active, ACTIVE)



TESTPCGFLAG(Unevictable, UNEVICTABLE)

SETPCGFLAG(Unevictable, UNEVICTABLE)

CLEARPCGFLAG(Unevictable, UNEVICTABLE)



static inline int page_cgroup_nid(struct page_cgroup *pc)

{

	return page_to_nid(pc->page);

}



static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)

{

	return page_zonenum(pc->page);

}



static inline void lock_page_cgroup(struct page_cgroup *pc)

{

	bit_spin_lock(PCG_LOCK, &pc->flags);

}



static inline int trylock_page_cgroup(struct page_cgroup *pc)

{

	return bit_spin_trylock(PCG_LOCK, &pc->flags);

}



static inline void unlock_page_cgroup(struct page_cgroup *pc)

{

	bit_spin_unlock(PCG_LOCK, &pc->flags);

}



#else /* CONFIG_CGROUP_MEM_RES_CTLR */

struct page_cgroup;



static inline void pgdat_page_cgroup_init(struct pglist_data *pgdat)

{

}



static inline struct page_cgroup *lookup_page_cgroup(struct page *page)

{

	return NULL;

}

#endif

#endif

mm/Makefile

+1 −2
Original line number Diff line number Diff line
@@ -33,5 +33,4 @@ obj-$(CONFIG_FS_XIP) += filemap_xip.o 
obj-$(CONFIG_MIGRATION) += migrate.o

obj-$(CONFIG_SMP) += allocpercpu.o

obj-$(CONFIG_QUICKLIST) += quicklist.o

obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o

obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o