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1 #ifndef __LINUX_PAGE_CGROUP_H |
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2 #define __LINUX_PAGE_CGROUP_H |
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3 |
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4 #ifdef CONFIG_CGROUP_MEM_RES_CTLR |
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5 #include <linux/bit_spinlock.h> |
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6 /* |
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7 * Page Cgroup can be considered as an extended mem_map. |
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8 * A page_cgroup page is associated with every page descriptor. The |
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9 * page_cgroup helps us identify information about the cgroup |
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10 * All page cgroups are allocated at boot or memory hotplug event, |
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11 * then the page cgroup for pfn always exists. |
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12 */ |
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13 struct page_cgroup { |
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14 unsigned long flags; |
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15 struct mem_cgroup *mem_cgroup; |
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16 struct page *page; |
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17 struct list_head lru; /* per cgroup LRU list */ |
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18 }; |
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19 |
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20 void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat); |
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21 void __init page_cgroup_init(void); |
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22 struct page_cgroup *lookup_page_cgroup(struct page *page); |
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23 |
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24 enum { |
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25 /* flags for mem_cgroup */ |
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26 PCG_LOCK, /* page cgroup is locked */ |
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27 PCG_CACHE, /* charged as cache */ |
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28 PCG_USED, /* this object is in use. */ |
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29 /* flags for LRU placement */ |
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30 PCG_ACTIVE, /* page is active in this cgroup */ |
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31 PCG_FILE, /* page is file system backed */ |
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32 PCG_UNEVICTABLE, /* page is unevictableable */ |
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33 }; |
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34 |
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35 #define TESTPCGFLAG(uname, lname) \ |
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36 static inline int PageCgroup##uname(struct page_cgroup *pc) \ |
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37 { return test_bit(PCG_##lname, &pc->flags); } |
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38 |
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39 #define SETPCGFLAG(uname, lname) \ |
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40 static inline void SetPageCgroup##uname(struct page_cgroup *pc)\ |
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41 { set_bit(PCG_##lname, &pc->flags); } |
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42 |
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43 #define CLEARPCGFLAG(uname, lname) \ |
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44 static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \ |
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45 { clear_bit(PCG_##lname, &pc->flags); } |
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46 |
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47 /* Cache flag is set only once (at allocation) */ |
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48 TESTPCGFLAG(Cache, CACHE) |
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49 |
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50 TESTPCGFLAG(Used, USED) |
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51 CLEARPCGFLAG(Used, USED) |
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52 |
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53 /* LRU management flags (from global-lru definition) */ |
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54 TESTPCGFLAG(File, FILE) |
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55 SETPCGFLAG(File, FILE) |
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56 CLEARPCGFLAG(File, FILE) |
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57 |
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58 TESTPCGFLAG(Active, ACTIVE) |
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59 SETPCGFLAG(Active, ACTIVE) |
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60 CLEARPCGFLAG(Active, ACTIVE) |
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61 |
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62 TESTPCGFLAG(Unevictable, UNEVICTABLE) |
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63 SETPCGFLAG(Unevictable, UNEVICTABLE) |
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64 CLEARPCGFLAG(Unevictable, UNEVICTABLE) |
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65 |
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66 static inline int page_cgroup_nid(struct page_cgroup *pc) |
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67 { |
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68 return page_to_nid(pc->page); |
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69 } |
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70 |
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71 static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc) |
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72 { |
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73 return page_zonenum(pc->page); |
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74 } |
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75 |
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76 static inline void lock_page_cgroup(struct page_cgroup *pc) |
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77 { |
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78 bit_spin_lock(PCG_LOCK, &pc->flags); |
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79 } |
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80 |
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81 static inline int trylock_page_cgroup(struct page_cgroup *pc) |
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82 { |
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83 return bit_spin_trylock(PCG_LOCK, &pc->flags); |
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84 } |
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85 |
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86 static inline void unlock_page_cgroup(struct page_cgroup *pc) |
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87 { |
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88 bit_spin_unlock(PCG_LOCK, &pc->flags); |
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89 } |
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90 |
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91 #else /* CONFIG_CGROUP_MEM_RES_CTLR */ |
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92 struct page_cgroup; |
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93 |
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94 static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
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95 { |
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96 } |
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97 |
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98 static inline struct page_cgroup *lookup_page_cgroup(struct page *page) |
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99 { |
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100 return NULL; |
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101 } |
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102 |
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103 static inline void page_cgroup_init(void) |
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104 { |
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105 } |
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106 |
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107 #endif |
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108 #endif |