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 struct alloc_tag *pgalloc_tag_get(struct page *page) 84 { 85 struct alloc_tag *tag = NULL; 86 87 if (mem_alloc_profiling_enabled()) { 88 union codetag_ref *ref = get_page_tag_ref(page); 89 90 alloc_tag_sub_check(ref); 91 if (ref) { 92 if (ref->ct) 93 tag = ct_to_alloc_tag(ref->ct); 94 put_page_tag_ref(ref); 95 } 96 } 97 98 return tag; 99 } 100 101 static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) 102 { 103 if (mem_alloc_profiling_enabled() && tag) 104 this_cpu_sub(tag->counters->bytes, PAGE_SIZE * nr); 105 } 106 107 #else /* CONFIG_MEM_ALLOC_PROFILING */ 108 109 static inline union codetag_ref *get_page_tag_ref(struct page *page) { return NULL; } 110 static inline void put_page_tag_ref(union codetag_ref *ref) {} 111 static inline void clear_page_tag_ref(struct page *page) {} 112 static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, 113 unsigned int nr) {} 114 static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) {} 115 static inline struct alloc_tag *pgalloc_tag_get(struct page *page) { return NULL; } 116 static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) {} 117 118 #endif /* CONFIG_MEM_ALLOC_PROFILING */ 119 120 #endif /* _LINUX_PGALLOC_TAG_H */ 121