diff --git a/libc/system_properties/Android.bp b/libc/system_properties/Android.bp
index 8780dda..dfe7a52 100644
--- a/libc/system_properties/Android.bp
+++ b/libc/system_properties/Android.bp
@@ -8,9 +8,11 @@
         "contexts_serialized.cpp",
         "prop_area.cpp",
         "prop_info.cpp",
+        "prop_trace.cpp",
         "system_properties.cpp",
     ],
     whole_static_libs: [
+        "libc_bionic_systrace",
         "libpropertyinfoparser",
     ],
     header_libs: [
diff --git a/libc/system_properties/include/system_properties/prop_trace.h b/libc/system_properties/include/system_properties/prop_trace.h
new file mode 100644
index 0000000..7c65a6d
--- /dev/null
+++ b/libc/system_properties/include/system_properties/prop_trace.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "platform/bionic/macros.h"
+
+#include "prop_info.h"
+
+// Tracing class for sysprop. To begin a trace at a specified point:
+//   SyspropTrace trace ("prop_name", "prop_value");
+// The trace will end when the constructor goes out of scope.
+// For read-only properties (ro.*), also need to pass prop_info struct.
+
+enum class PropertyAction {
+  kPropertyFind = 0,
+  kPropertySet,
+  kPropertyGetReadOnly,
+  kPropertyGetReadWrite,
+};
+
+class __LIBC_HIDDEN__ SyspropTrace {
+ public:
+  explicit SyspropTrace(const char* prop_name, const char* prop_value, const prop_info* pi,
+                        PropertyAction action);
+  ~SyspropTrace();
+
+ private:
+  const char* prop_name_;
+  const char* prop_value_;
+  const prop_info* prop_info_;
+  PropertyAction prop_action_;
+  bool output_trace_;
+
+  BIONIC_DISALLOW_COPY_AND_ASSIGN(SyspropTrace);
+};
diff --git a/libc/system_properties/prop_trace.cpp b/libc/system_properties/prop_trace.cpp
new file mode 100644
index 0000000..ac7ff94
--- /dev/null
+++ b/libc/system_properties/prop_trace.cpp
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "system_properties/prop_trace.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "private/CachedProperty.h"
+#include "private/bionic_lock.h"
+#include "private/bionic_systrace.h"
+
+#include <async_safe/log.h>
+#include <cutils/trace.h>  // For ATRACE_TAG_SYSPROP.
+
+#define PROP_TRACE_MSG_LENGTH 1024
+
+static bool should_trace_prop(const char* prop_name) {
+  // Should not trace kTraceTagsProp to avoid infinite recursion.
+  // Because the following g_trace_enable_flags.Get() will get the property value
+  // of kTraceTagsProp again, which in turn invokes should_trace_prop() here.
+  if (prop_name == nullptr || !strcmp(prop_name, kTraceTagsProp)) {
+    return false;
+  }
+
+  return should_trace(ATRACE_TAG_SYSPROP);
+}
+
+static void sysprop_trace_end() {
+  int trace_marker_fd = get_trace_marker_fd();
+  if (trace_marker_fd == -1) {
+    return;
+  }
+
+  TEMP_FAILURE_RETRY(write(trace_marker_fd, "E|", 2));
+}
+
+static void get_sysprop_trace_end(const prop_info* pi, const char* prop_value,
+                                  bool read_only = false) {
+  const char* output_value;
+  char message[PROP_TRACE_MSG_LENGTH];
+
+  if (read_only) {
+    if (pi->is_long()) {
+      output_value = pi->long_value();
+    } else {
+      output_value = pi->value;
+    }
+  } else {
+    output_value = prop_value;
+  }
+
+  snprintf(message, sizeof(message), "prop_get: %s, value: %s", pi->name,
+           output_value ? output_value : "null_value");
+  output_trace(message, 'E');  // 'E' for end.
+}
+
+SyspropTrace::SyspropTrace(const char* prop_name, const char* prop_value, const prop_info* pi,
+                           PropertyAction action)
+    : prop_name_(prop_name),
+      prop_value_(prop_value),
+      prop_info_(pi),
+      prop_action_(action),
+      output_trace_(false) {
+  if (!should_trace_prop(prop_name)) {
+    return;
+  }
+
+  char message[PROP_TRACE_MSG_LENGTH];
+  if (prop_action_ == PropertyAction::kPropertyFind) {
+    snprintf(message, sizeof(message), "prop_find: %s", prop_name_);
+  } else if (prop_action_ == PropertyAction::kPropertySet) {
+    snprintf(message, sizeof(message), "prop_set: %s, value: %s", prop_name_,
+             prop_value_ ? prop_value_ : "null_value");
+  } else {
+    // For property get, the prop_value_ will be resolved then printed in the destructor.
+    snprintf(message, sizeof(message), "prop_get: %s", prop_name_);
+  }
+
+  output_trace(message, 'B');  // 'B' for begin.
+  output_trace_ = true;
+}
+
+SyspropTrace::~SyspropTrace() {
+  if (!output_trace_) {
+    return;
+  }
+  if (prop_action_ == PropertyAction::kPropertyFind ||
+      prop_action_ == PropertyAction::kPropertySet) {
+    sysprop_trace_end();
+  } else if (prop_action_ == PropertyAction::kPropertyGetReadOnly) {
+    get_sysprop_trace_end(prop_info_, prop_value_, true /* read_only */);
+  } else if (prop_action_ == PropertyAction::kPropertyGetReadWrite) {
+    get_sysprop_trace_end(prop_info_, prop_value_, false /* read_only */);
+  }
+  output_trace_ = false;
+}
diff --git a/libc/system_properties/system_properties.cpp b/libc/system_properties/system_properties.cpp
index 8404778..3fd20b7 100644
--- a/libc/system_properties/system_properties.cpp
+++ b/libc/system_properties/system_properties.cpp
@@ -46,6 +46,7 @@
 #include "system_properties/context_node.h"
 #include "system_properties/prop_area.h"
 #include "system_properties/prop_info.h"
+#include "system_properties/prop_trace.h"
 
 #define SERIAL_DIRTY(serial) ((serial)&1)
 #define SERIAL_VALUE_LEN(serial) ((serial) >> 24)
@@ -127,6 +128,9 @@
     return nullptr;
   }
 
+  SyspropTrace trace(name, nullptr /* prop_value */, nullptr /* prop_info */,
+                     PropertyAction::kPropertyFind);
+
   prop_area* pa = contexts_->GetPropAreaForName(name);
   if (!pa) {
     async_safe_format_log(ANDROID_LOG_ERROR, "libc", "Access denied finding property \"%s\"", name);
@@ -201,6 +205,10 @@
   // Read only properties don't need to copy the value to a temporary buffer, since it can never
   // change.  We use relaxed memory order on the serial load for the same reason.
   if (is_read_only(pi->name)) {
+    // The 2nd argument is not required for read-only property tracing, as the
+    // value can be obtained via pi->value or pi->long_value().
+    SyspropTrace trace(pi->name, nullptr /* prop_value */, pi /* prop_info */,
+                       PropertyAction::kPropertyGetReadOnly);
     uint32_t serial = load_const_atomic(&pi->serial, memory_order_relaxed);
     if (pi->is_long()) {
       callback(cookie, pi->name, pi->long_value(), serial);
@@ -211,6 +219,8 @@
   }
 
   char value_buf[PROP_VALUE_MAX];
+  SyspropTrace trace(pi->name, value_buf, pi /* prop_info */,
+                     PropertyAction::kPropertyGetReadWrite);
   uint32_t serial = ReadMutablePropertyValue(pi, value_buf);
   callback(cookie, pi->name, value_buf, serial);
 }