--- zzzz-none-000/linux-4.4.60/mm/page_alloc.c	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/mm/page_alloc.c	2018-11-08 13:36:17.000000000 +0000
@@ -239,6 +239,7 @@
 };
 
 int min_free_kbytes = 1024;
+int low_free_kbytes_ratio;
 int user_min_free_kbytes = -1;
 
 static unsigned long __meminitdata nr_kernel_pages;
@@ -2115,6 +2116,9 @@
 {
 	int i;
 	gfp_t gfp_mask;
+#if defined(CONFIG_AVM_PAGE_TRACE)
+    unsigned long current_pc = avm_get_page_current_pc(page);
+#endif/*--- #if defined(CONFIG_AVM_PAGE_TRACE) ---*/
 
 	VM_BUG_ON_PAGE(PageCompound(page), page);
 	VM_BUG_ON_PAGE(!page_count(page), page);
@@ -2133,6 +2137,9 @@
 	for (i = 1; i < (1 << order); i++) {
 		set_page_refcounted(page + i);
 		set_page_owner(page + i, 0, gfp_mask);
+#if defined(CONFIG_AVM_PAGE_TRACE)
+        avm_set_page_current_pc(page + i,current_pc);
+#endif/*--- #if defined(CONFIG_AVM_PAGE_TRACE) ---*/
 	}
 }
 EXPORT_SYMBOL_GPL(split_page);
@@ -3192,7 +3199,11 @@
  */
 struct page *
 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
-			struct zonelist *zonelist, nodemask_t *nodemask)
+			struct zonelist *zonelist, nodemask_t *nodemask
+#if defined(CONFIG_AVM_PAGE_TRACE)
+            , unsigned long pc
+#endif/*--- #if defined(CONFIG_AVM_PAGE_TRACE) ---*/
+            )
 {
 	struct zoneref *preferred_zoneref;
 	struct page *page = NULL;
@@ -3272,6 +3283,12 @@
 	if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
 		goto retry_cpuset;
 
+#if defined(CONFIG_AVM_PAGE_TRACE)
+    if(likely(page)) {
+        avm_set_page_current_pc(page,pc);
+    }
+#endif/*--- #if defined(CONFIG_AVM_PAGE_TRACE) ---*/
+
 	return page;
 }
 EXPORT_SYMBOL(__alloc_pages_nodemask);
@@ -3706,6 +3723,12 @@
 	unsigned long free_pcp = 0;
 	int cpu;
 	struct zone *zone;
+#if defined(CONFIG_AVM_ENHANCED) 
+    int v_mem = get_used_vmalloc_mem();
+	if(v_mem >= 0) {
+		printk(KERN_ERR"vmalloc-used: %dKiB (%d pages)\n", v_mem >> 10, v_mem >> PAGE_SHIFT);
+	}
+#endif/*--- #if defined(CONFIG_AVM_ENHANCED)  ---*/
 
 	for_each_populated_zone(zone) {
 		if (skip_free_areas_node(filter, zone_to_nid(zone)))
@@ -6040,6 +6063,7 @@
 static void __setup_per_zone_wmarks(void)
 {
 	unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10);
+	unsigned long pages_low;
 	unsigned long lowmem_pages = 0;
 	struct zone *zone;
 	unsigned long flags;
@@ -6079,8 +6103,22 @@
 			zone->watermark[WMARK_MIN] = tmp;
 		}
 
-		zone->watermark[WMARK_LOW]  = min_wmark_pages(zone) + (tmp >> 2);
-		zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1);
+		if ((zone == &zone->zone_pgdat->node_zones[ZONE_NORMAL]) &&
+							low_free_kbytes_ratio) {
+			pages_low = (zone->managed_pages *
+					low_free_kbytes_ratio) / 100;
+			zone->watermark[WMARK_LOW]  = pages_low;
+			zone->watermark[WMARK_HIGH] = pages_low +
+							(pages_low >> 1);
+			pr_info("Modified watermark limit:low:%lukB\thigh:%lukB\n",
+				K(zone->watermark[WMARK_LOW]),
+				K(zone->watermark[WMARK_HIGH]));
+		} else {
+			zone->watermark[WMARK_LOW] = min_wmark_pages(zone) +
+							(tmp >> 2);
+			zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) +
+							(tmp >> 1);
+		}
 
 		__mod_zone_page_state(zone, NR_ALLOC_BATCH,
 			high_wmark_pages(zone) - low_wmark_pages(zone) -
@@ -6221,6 +6259,34 @@
 	return 0;
 }
 
+/*
+ * low_free_kbytes_ratio_sysctl_handler - just a wrapper around proc_dointvec()
+ *	so that we can call two helper functions whenever low_free_kbytes_ratio
+ *	changes.
+ */
+int low_free_kbytes_ratio_sysctl_handler(struct ctl_table *table, int write,
+	void __user *buffer, size_t *length, loff_t *ppos)
+{
+	int rc;
+	int tmp = low_free_kbytes_ratio;
+
+	rc = proc_dointvec_minmax(table, write, buffer, length, ppos);
+	if (rc)
+		return rc;
+
+	if (write) {
+		if (low_free_kbytes_ratio && (low_free_kbytes_ratio < 10 ||
+						low_free_kbytes_ratio > 40)) {
+			pr_warn("low_free_kbytes_ratio is not in the permissible range\n");
+			low_free_kbytes_ratio = tmp;
+			return -EINVAL;
+		}
+		setup_per_zone_wmarks();
+	}
+
+	return 0;
+}
+
 #ifdef CONFIG_NUMA
 int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write,
 	void __user *buffer, size_t *length, loff_t *ppos)