--- zzzz-none-000/linux-4.4.60/include/linux/mm.h	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/include/linux/mm.h	2021-02-04 17:41:59.000000000 +0000
@@ -30,6 +30,11 @@
 struct writeback_control;
 struct bdi_writeback;
 
+#if defined(CONFIG_AVM_PAGE_TRACE)
+unsigned long avm_get_page_current_pc(struct page *page);
+void avm_set_page_current_pc(struct page *page, unsigned long pc);
+#endif/*--- #if defined(CONFIG_AVM_PAGE_TRACE)  ---*/
+
 #ifndef CONFIG_NEED_MULTIPLE_NODES	/* Don't use mapnrs, do it properly */
 extern unsigned long max_mapnr;
 
@@ -516,7 +521,18 @@
 void put_page(struct page *page);
 void put_pages_list(struct list_head *pages);
 
-void split_page(struct page *page, unsigned int order);
+void __split_page(struct page *page, unsigned int order
+#if defined(CONFIG_AVM_PAGE_TRACE)
+		 , unsigned long pc
+#endif
+		);
+
+#if defined(CONFIG_AVM_PAGE_TRACE)
+#define split_page(page, order)	__split_page(page, order, _RET_IP_)
+#else
+#define split_page(page, order)	__split_page(page, order)
+#endif
+
 int split_free_page(struct page *page);
 
 /*
@@ -1821,6 +1837,7 @@
 
 /* page_alloc.c */
 extern int min_free_kbytes;
+extern int low_free_kbytes_ratio;
 
 /* nommu.c */
 extern atomic_long_t mmap_pages_allocated;
@@ -1993,7 +2010,12 @@
 void task_dirty_inc(struct task_struct *tsk);
 
 /* readahead.c */
-#define VM_MAX_READAHEAD	128	/* kbytes */
+#if defined (CONFIG_AVM_KERNEL)
+	/* 20160725 AVM/VGJ larger USB storage transfers for more speed */
+	#define VM_MAX_READAHEAD	512	/* kbytes */
+#else
+	#define VM_MAX_READAHEAD	128	/* kbytes */
+#endif
 #define VM_MIN_READAHEAD	16	/* kbytes (includes current page) */
 
 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,