diff --git a/libs/ui/Android.mk b/libs/ui/Android.mk
index 9f49348..c4a09d6 100644
--- a/libs/ui/Android.mk
+++ b/libs/ui/Android.mk
@@ -9,6 +9,7 @@
 	GraphicBuffer.cpp \
 	GraphicBufferAllocator.cpp \
 	GraphicBufferMapper.cpp \
+	GraphicLog.cpp \
 	KeyLayoutMap.cpp \
 	KeyCharacterMap.cpp \
 	Input.cpp \
diff --git a/libs/ui/FramebufferNativeWindow.cpp b/libs/ui/FramebufferNativeWindow.cpp
index 6f8948d..a36d555 100644
--- a/libs/ui/FramebufferNativeWindow.cpp
+++ b/libs/ui/FramebufferNativeWindow.cpp
@@ -29,6 +29,7 @@
 
 #include <ui/Rect.h>
 #include <ui/FramebufferNativeWindow.h>
+#include <ui/GraphicLog.h>
 
 #include <EGL/egl.h>
 
@@ -174,6 +175,14 @@
     return fb->setSwapInterval(fb, interval);
 }
 
+// only for debugging / logging
+int FramebufferNativeWindow::getCurrentBufferIndex() const
+{
+    Mutex::Autolock _l(mutex);
+    const int index = mCurrentBufferIndex;
+    return index;
+}
+
 int FramebufferNativeWindow::dequeueBuffer(ANativeWindow* window, 
         android_native_buffer_t** buffer)
 {
@@ -181,18 +190,24 @@
     Mutex::Autolock _l(self->mutex);
     framebuffer_device_t* fb = self->fbDev;
 
+    int index = self->mBufferHead++;
+    if (self->mBufferHead >= self->mNumBuffers)
+        self->mBufferHead = 0;
+
+    GraphicLog& logger(GraphicLog::getInstance());
+    logger.log(GraphicLog::SF_FB_DEQUEUE_BEFORE, index);
+
     // wait for a free buffer
     while (!self->mNumFreeBuffers) {
         self->mCondition.wait(self->mutex);
     }
     // get this buffer
     self->mNumFreeBuffers--;
-    int index = self->mBufferHead++;
-    if (self->mBufferHead >= self->mNumBuffers)
-        self->mBufferHead = 0;
+    self->mCurrentBufferIndex = index;
 
     *buffer = self->buffers[index].get();
 
+    logger.log(GraphicLog::SF_FB_DEQUEUE_AFTER, index);
     return 0;
 }
 
@@ -202,11 +217,17 @@
     FramebufferNativeWindow* self = getSelf(window);
     Mutex::Autolock _l(self->mutex);
 
+    const int index = self->mCurrentBufferIndex;
+    GraphicLog& logger(GraphicLog::getInstance());
+    logger.log(GraphicLog::SF_FB_LOCK_BEFORE, index);
+
     // wait that the buffer we're locking is not front anymore
     while (self->front == buffer) {
         self->mCondition.wait(self->mutex);
     }
 
+    logger.log(GraphicLog::SF_FB_LOCK_AFTER, index);
+
     return NO_ERROR;
 }
 
@@ -217,7 +238,15 @@
     Mutex::Autolock _l(self->mutex);
     framebuffer_device_t* fb = self->fbDev;
     buffer_handle_t handle = static_cast<NativeBuffer*>(buffer)->handle;
+
+    const int index = self->mCurrentBufferIndex;
+    GraphicLog& logger(GraphicLog::getInstance());
+    logger.log(GraphicLog::SF_FB_POST_BEFORE, index);
+
     int res = fb->post(fb, handle);
+
+    logger.log(GraphicLog::SF_FB_POST_AFTER, index);
+
     self->front = static_cast<NativeBuffer*>(buffer);
     self->mNumFreeBuffers++;
     self->mCondition.broadcast();
diff --git a/libs/ui/GraphicLog.cpp b/libs/ui/GraphicLog.cpp
new file mode 100644
index 0000000..b55ce23
--- /dev/null
+++ b/libs/ui/GraphicLog.cpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2010 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 <stdlib.h>
+#include <unistd.h>
+#include <cutils/log.h>
+#include <cutils/properties.h>
+#include <utils/Endian.h>
+#include <utils/Timers.h>
+
+#include <ui/GraphicLog.h>
+
+namespace android {
+
+ANDROID_SINGLETON_STATIC_INSTANCE(GraphicLog)
+
+static inline
+void writeInt32(uint8_t* base, size_t& pos, int32_t value) {
+    int32_t v = htole32(value);
+    base[pos] = EVENT_TYPE_INT;
+    memcpy(&base[pos+1], &v, sizeof(int32_t));
+    pos += 1+sizeof(int32_t);
+}
+
+static inline
+void writeInt64(uint8_t* base,  size_t& pos, int64_t value) {
+    int64_t v = htole64(value);
+    base[pos] = EVENT_TYPE_LONG;
+    memcpy(&base[pos+1], &v, sizeof(int64_t));
+    pos += 1+sizeof(int64_t);
+}
+
+void GraphicLog::logImpl(int32_t tag, int32_t buffer)
+{
+    uint8_t scratch[2 + 2 + sizeof(int32_t) + sizeof(int64_t)];
+    size_t pos = 0;
+    scratch[pos++] = EVENT_TYPE_LIST;
+    scratch[pos++] = 2;
+    writeInt32(scratch, pos, buffer);
+    writeInt64(scratch, pos, ns2ms( systemTime( SYSTEM_TIME_MONOTONIC ) ));
+    android_bWriteLog(tag, scratch, sizeof(scratch));
+}
+
+void GraphicLog::logImpl(int32_t tag, int32_t identity, int32_t buffer)
+{
+    uint8_t scratch[2 + 3 + sizeof(int32_t) + sizeof(int32_t) + sizeof(int64_t)];
+    size_t pos = 0;
+    scratch[pos++] = EVENT_TYPE_LIST;
+    scratch[pos++] = 3;
+    writeInt32(scratch, pos, buffer);
+    writeInt32(scratch, pos, identity);
+    writeInt64(scratch, pos, ns2ms( systemTime( SYSTEM_TIME_MONOTONIC ) ));
+    android_bWriteLog(tag, scratch, sizeof(scratch));
+}
+
+GraphicLog::GraphicLog()
+    : mEnabled(0)
+{
+    char property[PROPERTY_VALUE_MAX];
+    if (property_get("debug.graphic_log", property, NULL) > 0) {
+        mEnabled = atoi(property);
+    }
+}
+
+void GraphicLog::setEnabled(bool enable)
+{
+    mEnabled = enable;
+}
+
+}