1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * page allocation tagging 4 */ 5 #ifndef _LINUX_PGALLOC_TAG_H 6 #define _LINUX_PGALLOC_TAG_H 7 8 #include <linux/alloc_tag.h> 9 10 #ifdef CONFIG_MEM_ALLOC_PROFILING 11 12 #include <linux/page_ext.h> 13 14 extern struct page_ext_operations page_alloc_tagging_ops; 15 16 static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext *page_ext) 17 { 18 return (union codetag_ref *)page_ext_data(page_ext, &page_alloc_tagging_ops); 19 } 20 21 static inline struct page_ext *page_ext_from_codetag_ref(union codetag_ref *ref) 22 { 23 return (void *)ref - page_alloc_tagging_ops.offset; 24 } 25 26 /* Should be called only if mem_alloc_profiling_enabled() */ 27 static inline union codetag_ref *get_page_tag_ref(struct page *page) 28 { 29 if (page) { 30 struct page_ext *page_ext = page_ext_get(page); 31 32 if (page_ext) 33 return codetag_ref_from_page_ext(page_ext); 34 } 35 return NULL; 36 } 37 38 static inline void put_page_tag_ref(union codetag_ref *ref) 39 { 40 if (WARN_ON(!ref)) 41 return; 42 43 page_ext_put(page_ext_from_codetag_ref(ref)); 44 } 45 46 static inline void clear_page_tag_ref(struct page *page) 47 { 48 if (mem_alloc_profiling_enabled()) { 49 union codetag_ref *ref = get_page_tag_ref(page); 50 51 if (ref) { 52 set_codetag_empty(ref); 53 put_page_tag_ref(ref); 54 } 55 } 56 } 57 58 static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, 59 unsigned int nr) 60 { 61 if (mem_alloc_profiling_enabled()) { 62 union codetag_ref *ref = get_page_tag_ref(page); 63 64 if (ref) { 65 alloc_tag_add(ref, task->alloc_tag, PAGE_SIZE * nr); 66 put_page_tag_ref(ref); 67 } 68 } 69 } 70 71 static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) 72 { 73 if (mem_alloc_profiling_enabled()) { 74 union codetag_ref *ref = get_page_tag_ref(page); 75 76 if (ref) { 77 alloc_tag_sub(ref, PAGE_SIZE * nr); 78 put_page_tag_ref(ref); 79 } 80 } 81 } 82 83 static inline void pgalloc_tag_split(struct page *page, unsigned int nr) 84 { 85 int i; 86 struct page_ext *first_page_ext; 87 struct page_ext *page_ext; 88 union codetag_ref *ref; 89 struct alloc_tag *tag; 90 91 if (!mem_alloc_profiling_enabled()) 92 return; 93 94 first_page_ext = page_ext = page_ext_get(page); 95 if (unlikely(!page_ext)) 96 return; 97 98 ref = codetag_ref_from_page_ext(page_ext); 99 if (!ref->ct) 100 goto out; 101 102 tag = ct_to_alloc_tag(ref->ct); 103 page_ext = page_ext_next(page_ext); 104 for (i = 1; i < nr; i++) { 105 /* Set new reference to point to the original tag */ 106 alloc_tag_ref_set(codetag_ref_from_page_ext(page_ext), tag); 107 page_ext = page_ext_next(page_ext); 108 } 109 out: 110 page_ext_put(first_page_ext); 111 } 112 113 static inline struct alloc_tag *pgalloc_tag_get(struct page *page) 114 { 115 struct alloc_tag *tag = NULL; 116 117 if (mem_alloc_profiling_enabled()) { 118 union codetag_ref *ref = get_page_tag_ref(page); 119 120 alloc_tag_sub_check(ref); 121 if (ref) { 122 if (ref->ct) 123 tag = ct_to_alloc_tag(ref->ct); 124 put_page_tag_ref(ref); 125 } 126 } 127 128 return tag; 129 } 130 131 static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) 132 { 133 if (mem_alloc_profiling_enabled() && tag) 134 this_cpu_sub(tag->counters->bytes, PAGE_SIZE * nr); 135 } 136 137 #else /* CONFIG_MEM_ALLOC_PROFILING */ 138 139 static inline union codetag_ref *get_page_tag_ref(struct page *page) { return NULL; } 140 static inline void put_page_tag_ref(union codetag_ref *ref) {} 141 static inline void clear_page_tag_ref(struct page *page) {} 142 static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, 143 unsigned int nr) {} 144 static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) {} 145 static inline void pgalloc_tag_split(struct page *page, unsigned int nr) {} 146 static inline struct alloc_tag *pgalloc_tag_get(struct page *page) { return NULL; } 147 static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) {} 148 149 #endif /* CONFIG_MEM_ALLOC_PROFILING */ 150 151 #endif /* _LINUX_PGALLOC_TAG_H */ 152