024914477e
This patch is another core part of this move-charge-at-task-migration feature. It enables moving charges of anonymous swaps. To move the charge of swap, we need to exchange swap_cgroup's record. In current implementation, swap_cgroup's record is protected by: - page lock: if the entry is on swap cache. - swap_lock: if the entry is not on swap cache. This works well in usual swap-in/out activity. But this behavior make the feature of moving swap charge check many conditions to exchange swap_cgroup's record safely. So I changed modification of swap_cgroup's recored(swap_cgroup_record()) to use xchg, and define a new function to cmpxchg swap_cgroup's record. This patch also enables moving charge of non pte_present but not uncharged swap caches, which can be exist on swap-out path, by getting the target pages via find_get_page() as do_mincore() does. [kosaki.motohiro@jp.fujitsu.com: fix ia64 build] [akpm@linux-foundation.org: fix typos] Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
#ifndef __LINUX_PAGE_CGROUP_H
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#define __LINUX_PAGE_CGROUP_H
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#ifdef CONFIG_CGROUP_MEM_RES_CTLR
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#include <linux/bit_spinlock.h>
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/*
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* Page Cgroup can be considered as an extended mem_map.
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* A page_cgroup page is associated with every page descriptor. The
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* page_cgroup helps us identify information about the cgroup
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* All page cgroups are allocated at boot or memory hotplug event,
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* then the page cgroup for pfn always exists.
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*/
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struct page_cgroup {
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unsigned long flags;
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struct mem_cgroup *mem_cgroup;
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struct page *page;
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struct list_head lru; /* per cgroup LRU list */
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};
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void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
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#ifdef CONFIG_SPARSEMEM
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static inline void __init page_cgroup_init_flatmem(void)
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{
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}
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extern void __init page_cgroup_init(void);
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#else
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void __init page_cgroup_init_flatmem(void);
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static inline void __init page_cgroup_init(void)
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{
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}
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#endif
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struct page_cgroup *lookup_page_cgroup(struct page *page);
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enum {
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/* flags for mem_cgroup */
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PCG_LOCK, /* page cgroup is locked */
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PCG_CACHE, /* charged as cache */
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PCG_USED, /* this object is in use. */
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PCG_ACCT_LRU, /* page has been accounted for */
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};
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#define TESTPCGFLAG(uname, lname) \
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static inline int PageCgroup##uname(struct page_cgroup *pc) \
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{ return test_bit(PCG_##lname, &pc->flags); }
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#define SETPCGFLAG(uname, lname) \
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static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
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{ set_bit(PCG_##lname, &pc->flags); }
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#define CLEARPCGFLAG(uname, lname) \
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static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \
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{ clear_bit(PCG_##lname, &pc->flags); }
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#define TESTCLEARPCGFLAG(uname, lname) \
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static inline int TestClearPageCgroup##uname(struct page_cgroup *pc) \
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{ return test_and_clear_bit(PCG_##lname, &pc->flags); }
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TESTPCGFLAG(Locked, LOCK)
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/* Cache flag is set only once (at allocation) */
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TESTPCGFLAG(Cache, CACHE)
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CLEARPCGFLAG(Cache, CACHE)
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SETPCGFLAG(Cache, CACHE)
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TESTPCGFLAG(Used, USED)
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CLEARPCGFLAG(Used, USED)
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SETPCGFLAG(Used, USED)
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SETPCGFLAG(AcctLRU, ACCT_LRU)
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CLEARPCGFLAG(AcctLRU, ACCT_LRU)
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TESTPCGFLAG(AcctLRU, ACCT_LRU)
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TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU)
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static inline int page_cgroup_nid(struct page_cgroup *pc)
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{
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return page_to_nid(pc->page);
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}
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static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
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{
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return page_zonenum(pc->page);
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}
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static inline void lock_page_cgroup(struct page_cgroup *pc)
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{
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bit_spin_lock(PCG_LOCK, &pc->flags);
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}
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static inline void unlock_page_cgroup(struct page_cgroup *pc)
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{
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bit_spin_unlock(PCG_LOCK, &pc->flags);
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}
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#else /* CONFIG_CGROUP_MEM_RES_CTLR */
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struct page_cgroup;
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static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
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{
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}
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static inline struct page_cgroup *lookup_page_cgroup(struct page *page)
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{
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return NULL;
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}
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static inline void page_cgroup_init(void)
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{
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}
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static inline void __init page_cgroup_init_flatmem(void)
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{
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}
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#endif
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#include <linux/swap.h>
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#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
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extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
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unsigned short old, unsigned short new);
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extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id);
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extern unsigned short lookup_swap_cgroup(swp_entry_t ent);
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extern int swap_cgroup_swapon(int type, unsigned long max_pages);
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extern void swap_cgroup_swapoff(int type);
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#else
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static inline
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unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
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{
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return 0;
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}
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static inline
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unsigned short lookup_swap_cgroup(swp_entry_t ent)
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{
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return 0;
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}
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static inline int
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swap_cgroup_swapon(int type, unsigned long max_pages)
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{
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return 0;
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}
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static inline void swap_cgroup_swapoff(int type)
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{
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return;
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}
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#endif
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#endif
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