diff --git a/nemu/src/cpu/Kconfig b/nemu/src/cpu/Kconfig
index 57e94ab..cac6ceb 100644
--- a/nemu/src/cpu/Kconfig
+++ b/nemu/src/cpu/Kconfig
@@ -90,6 +90,17 @@ menuconfig DTRACE
 
 if DTRACE
 
+config DTRACE_COND
+  string "Only trace device when the condition is true (you can use 'offset' variable)"
+  default "offset >= 0"
+
+config DTRACE_WRITE
+  bool "Enable device trace on write"
+  default y
+
+config DTRACE_READ
+  bool "Enable device trace on read"
+  default y
 
 endif # DTRACE
 
diff --git a/nemu/src/device/io/map.c b/nemu/src/device/io/map.c
index c3ab777..8a53450 100644
--- a/nemu/src/device/io/map.c
+++ b/nemu/src/device/io/map.c
@@ -58,6 +58,10 @@ word_t map_read(paddr_t addr, int len, IOMap *map) {
   paddr_t offset = addr - map->low;
   invoke_callback(map->callback, offset, len, false); // prepare data to read
   word_t ret = host_read(map->space + offset, len);
+#ifdef CONFIG_DTRACE_READ
+  if (CONFIG_DTRACE_COND) log_write("device_read " FMT_WORD " from offset " FMT_PADDR " (%s)\n",
+    ret, offset, map->name);
+#endif
 //word_t ret = *(word_t*)(map->space + offset);
 //printf("map_read: %p, %d\n", map->space + offset, ret);
   return ret;
@@ -68,5 +72,9 @@ void map_write(paddr_t addr, int len, word_t data, IOMap *map) {
   check_bound(map, addr);
   paddr_t offset = addr - map->low;
   host_write(map->space + offset, len, data);
+#ifdef CONFIG_DTRACE_WRITE
+  if (CONFIG_DTRACE_COND) log_write("device_write " FMT_WORD " from offset " FMT_PADDR " (%s)\n",
+    data, offset, map->name);
+#endif
   invoke_callback(map->callback, offset, len, true);
 }