diff -pru a/include/linux/mm.h b/include/linux/mm.h
--- a/include/linux/mm.h	2020-12-30 19:54:29.000000000 +0900
+++ b/include/linux/mm.h	2021-02-16 03:44:03.789770868 +0900
@@ -205,6 +205,11 @@ extern int sysctl_max_map_count;
 extern unsigned long sysctl_user_reserve_kbytes;
 extern unsigned long sysctl_admin_reserve_kbytes;

+#if defined(CONFIG_PROTECT_FILE)
+extern unsigned long sysctl_file_low_kbytes;
+extern unsigned long sysctl_file_min_kbytes;
+#endif
+
 extern int sysctl_overcommit_memory;
 extern int sysctl_overcommit_ratio;
 extern unsigned long sysctl_overcommit_kbytes;
diff -pru a/kernel/sysctl.c b/kernel/sysctl.c
--- a/kernel/sysctl.c	2020-12-30 19:54:29.000000000 +0900
+++ b/kernel/sysctl.c	2021-02-16 03:44:03.789770868 +0900
@@ -111,6 +111,19 @@
 static int sixty = 60;
 #endif

+#if defined(CONFIG_PROTECT_FILE)
+#if CONFIG_PROTECT_FILE_LOW_KBYTES < 0
+#error "CONFIG_PROTECT_FILE_LOW_KBYTES should be >= 0"
+#endif
+#if CONFIG_PROTECT_FILE_MIN_KBYTES < 0
+#error "CONFIG_PROTECT_FILE_MIN_KBYTES should be >= 0"
+#endif
+unsigned long sysctl_file_low_kbytes __read_mostly =
+	CONFIG_PROTECT_FILE_LOW_KBYTES;
+unsigned long sysctl_file_min_kbytes __read_mostly =
+	CONFIG_PROTECT_FILE_MIN_KBYTES;
+#endif
+
 static int __maybe_unused neg_one = -1;
 static int __maybe_unused two = 2;
 static int __maybe_unused four = 4;
@@ -3082,6 +3095,22 @@ static struct ctl_table vm_table[] = {
 		.extra2		= SYSCTL_ONE,
 	},
 #endif
+#if defined(CONFIG_PROTECT_FILE)
+	{
+		.procname	= "file_low_kbytes",
+		.data		= &sysctl_file_low_kbytes,
+		.maxlen		= sizeof(sysctl_file_low_kbytes),
+		.mode		= 0644,
+		.proc_handler	= proc_doulongvec_minmax,
+	},
+	{
+		.procname	= "file_min_kbytes",
+		.data		= &sysctl_file_min_kbytes,
+		.maxlen		= sizeof(sysctl_file_min_kbytes),
+		.mode		= 0644,
+		.proc_handler	= proc_doulongvec_minmax,
+	},
+#endif
 	{
 		.procname	= "user_reserve_kbytes",
 		.data		= &sysctl_user_reserve_kbytes,
diff -pru a/mm/Kconfig b/mm/Kconfig
--- a/mm/Kconfig	2020-12-30 19:54:29.000000000 +0900
+++ b/mm/Kconfig	2021-02-16 03:44:03.789770868 +0900
@@ -63,6 +63,20 @@ config SPARSEMEM_MANUAL

 endchoice

+config PROTECT_FILE
+	def_bool y
+	depends on SYSCTL
+
+config PROTECT_FILE_LOW_KBYTES
+	int "Default value for vm.file_low_kbytes"
+	depends on PROTECT_FILE
+	default "0"
+
+config PROTECT_FILE_MIN_KBYTES
+	int "Default value for vm.file_min_kbytes"
+	depends on PROTECT_FILE
+	default "0"
+
 config DISCONTIGMEM
 	def_bool y
 	depends on (!SELECT_MEMORY_MODEL && ARCH_DISCONTIGMEM_ENABLE) || DISCONTIGMEM_MANUAL
diff -pru a/mm/vmscan.c b/mm/vmscan.c
--- a/mm/vmscan.c	2020-12-30 19:54:29.000000000 +0900
+++ b/mm/vmscan.c	2021-02-16 03:54:29.737443977 +0900
@@ -120,6 +120,10 @@ struct scan_control {
 	/* The file pages on the current node are dangerously low */
 	unsigned int file_is_tiny:1;

+#if defined(CONFIG_PROTECT_FILE)
+	unsigned int file_is_min:1;
+#endif
+
 	/* Allocation order */
 	s8 order;

@@ -2242,6 +2246,13 @@ static void get_scan_count(struct lruvec
 	unsigned long ap, fp;
 	enum lru_list lru;

+#if defined(CONFIG_PROTECT_FILE)
+	if (sc->file_is_min) {
+		scan_balance = SCAN_ANON;
+		goto out;
+	}
+#endif
+
 	/* If we have no swap space, do not bother scanning anon pages. */
 	if (!sc->may_swap || mem_cgroup_get_nr_swap_pages(memcg) <= 0) {
 		scan_balance = SCAN_FILE;
@@ -2762,6 +2773,14 @@ again:
 			file + free <= total_high_wmark &&
 			!(sc->may_deactivate & DEACTIVATE_ANON) &&
 			anon >> sc->priority;
+
+#if defined(CONFIG_PROTECT_FILE)
+		file <<= (PAGE_SHIFT - 10);
+		sc->file_is_min = file <= sysctl_file_min_kbytes;
+		if (file <= sysctl_file_low_kbytes)
+			sc->file_is_tiny = true;
+#endif
+
 	}

 	shrink_node_memcgs(pgdat, sc);