1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _MM_PAGE_REPORTING_H 3 #define _MM_PAGE_REPORTING_H 4 5 #include <linux/mmzone.h> 6 #include <linux/pageblock-flags.h> 7 #include <linux/page-isolation.h> 8 #include <linux/jump_label.h> 9 #include <linux/slab.h> 10 #include <linux/pgtable.h> 11 #include <linux/scatterlist.h> 12 13 #define PAGE_REPORTING_MIN_ORDER pageblock_order 14 15 #ifdef CONFIG_PAGE_REPORTING 16 DECLARE_STATIC_KEY_FALSE(page_reporting_enabled); 17 void __page_reporting_notify(void); 18 19 static inline bool page_reported(struct page *page) 20 { 21 return static_branch_unlikely(&page_reporting_enabled) && 22 PageReported(page); 23 } 24 25 /** 26 * page_reporting_notify_free - Free page notification to start page processing 27 * 28 * This function is meant to act as a screener for __page_reporting_notify 29 * which will determine if a give zone has crossed over the high-water mark 30 * that will justify us beginning page treatment. If we have crossed that 31 * threshold then it will start the process of pulling some pages and 32 * placing them in the batch list for treatment. 33 */ 34 static inline void page_reporting_notify_free(unsigned int order) 35 { 36 /* Called from hot path in __free_one_page() */ 37 if (!static_branch_unlikely(&page_reporting_enabled)) 38 return; 39 40 /* Determine if we have crossed reporting threshold */ 41 if (order < PAGE_REPORTING_MIN_ORDER) 42 return; 43 44 /* This will add a few cycles, but should be called infrequently */ 45 __page_reporting_notify(); 46 } 47 #else /* CONFIG_PAGE_REPORTING */ 48 #define page_reported(_page) false 49 50 static inline void page_reporting_notify_free(unsigned int order) 51 { 52 } 53 #endif /* CONFIG_PAGE_REPORTING */ 54 #endif /*_MM_PAGE_REPORTING_H */ 55