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 (void *)page_ext + page_alloc_tagging_ops.offset; 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 pgalloc_tag_add(struct page *page, struct task_struct *task, 47 unsigned int nr) 48 { 49 if (mem_alloc_profiling_enabled()) { 50 union codetag_ref *ref = get_page_tag_ref(page); 51 52 if (ref) { 53 alloc_tag_add(ref, task->alloc_tag, PAGE_SIZE * nr); 54 put_page_tag_ref(ref); 55 } 56 } 57 } 58 59 static inline void pgalloc_tag_sub(struct page *page, 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_sub(ref, PAGE_SIZE * nr); 66 put_page_tag_ref(ref); 67 } 68 } 69 } 70 71 static inline void pgalloc_tag_split(struct page *page, unsigned int nr) 72 { 73 int i; 74 struct page_ext *page_ext; 75 union codetag_ref *ref; 76 struct alloc_tag *tag; 77 78 if (!mem_alloc_profiling_enabled()) 79 return; 80 81 page_ext = page_ext_get(page); 82 if (unlikely(!page_ext)) 83 return; 84 85 ref = codetag_ref_from_page_ext(page_ext); 86 if (!ref->ct) 87 goto out; 88 89 tag = ct_to_alloc_tag(ref->ct); 90 page_ext = page_ext_next(page_ext); 91 for (i = 1; i < nr; i++) { 92 /* Set new reference to point to the original tag */ 93 alloc_tag_ref_set(codetag_ref_from_page_ext(page_ext), tag); 94 page_ext = page_ext_next(page_ext); 95 } 96 out: 97 page_ext_put(page_ext); 98 } 99 100 static inline struct alloc_tag *pgalloc_tag_get(struct page *page) 101 { 102 struct alloc_tag *tag = NULL; 103 104 if (mem_alloc_profiling_enabled()) { 105 union codetag_ref *ref = get_page_tag_ref(page); 106 107 alloc_tag_sub_check(ref); 108 if (ref) { 109 if (ref->ct) 110 tag = ct_to_alloc_tag(ref->ct); 111 put_page_tag_ref(ref); 112 } 113 } 114 115 return tag; 116 } 117 118 static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) 119 { 120 if (mem_alloc_profiling_enabled() && tag) 121 this_cpu_sub(tag->counters->bytes, PAGE_SIZE * nr); 122 } 123 124 #else /* CONFIG_MEM_ALLOC_PROFILING */ 125 126 static inline union codetag_ref *get_page_tag_ref(struct page *page) { return NULL; } 127 static inline void put_page_tag_ref(union codetag_ref *ref) {} 128 static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, 129 unsigned int nr) {} 130 static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) {} 131 static inline void pgalloc_tag_split(struct page *page, unsigned int nr) {} 132 static inline struct alloc_tag *pgalloc_tag_get(struct page *page) { return NULL; } 133 static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) {} 134 135 #endif /* CONFIG_MEM_ALLOC_PROFILING */ 136 137 #endif /* _LINUX_PGALLOC_TAG_H */ 138