1 files changed, 78 insertions, 0 deletions
diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h
new file mode 100644
index 000000000000..66bd021eb46e
--- /dev/null
+++ b/include/linux/pgalloc_tag.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * page allocation tagging
+ */
+#ifndef _LINUX_PGALLOC_TAG_H
+#define _LINUX_PGALLOC_TAG_H
+
+#include <linux/alloc_tag.h>
+
+#ifdef CONFIG_MEM_ALLOC_PROFILING
+
+#include <linux/page_ext.h>
+
+extern struct page_ext_operations page_alloc_tagging_ops;
+extern struct page_ext *page_ext_get(struct page *page);
+extern void page_ext_put(struct page_ext *page_ext);
+
+static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext *page_ext)
+{
+	return (void *)page_ext + page_alloc_tagging_ops.offset;
+}
+
+static inline struct page_ext *page_ext_from_codetag_ref(union codetag_ref *ref)
+{
+	return (void *)ref - page_alloc_tagging_ops.offset;
+}
+
+/* Should be called only if mem_alloc_profiling_enabled() */
+static inline union codetag_ref *get_page_tag_ref(struct page *page)
+{
+	if (page) {
+		struct page_ext *page_ext = page_ext_get(page);
+
+		if (page_ext)
+			return codetag_ref_from_page_ext(page_ext);
+	}
+	return NULL;
+}
+
+static inline void put_page_tag_ref(union codetag_ref *ref)
+{
+	page_ext_put(page_ext_from_codetag_ref(ref));
+}
+
+static inline void pgalloc_tag_add(struct page *page, struct task_struct *task,
+				   unsigned int nr)
+{
+	if (mem_alloc_profiling_enabled()) {
+		union codetag_ref *ref = get_page_tag_ref(page);
+
+		if (ref) {
+			alloc_tag_add(ref, task->alloc_tag, PAGE_SIZE * nr);
+			put_page_tag_ref(ref);
+		}
+	}
+}
+
+static inline void pgalloc_tag_sub(struct page *page, unsigned int nr)
+{
+	if (mem_alloc_profiling_enabled()) {
+		union codetag_ref *ref = get_page_tag_ref(page);
+
+		if (ref) {
+			alloc_tag_sub(ref, PAGE_SIZE * nr);
+			put_page_tag_ref(ref);
+		}
+	}
+}
+
+#else /* CONFIG_MEM_ALLOC_PROFILING */
+
+static inline void pgalloc_tag_add(struct page *page, struct task_struct *task,
+				   unsigned int nr) {}
+static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) {}
+
+#endif /* CONFIG_MEM_ALLOC_PROFILING */
+
+#endif /* _LINUX_PGALLOC_TAG_H */