diff --git a/core/Makefile b/core/Makefile
index 2825e88..78ead17 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -711,13 +711,16 @@
 define generate-userimage-prop-dictionary
 $(if $(INTERNAL_USERIMAGES_EXT_VARIANT),$(hide) echo "fs_type=$(INTERNAL_USERIMAGES_EXT_VARIANT)" >> $(1))
 $(if $(BOARD_SYSTEMIMAGE_PARTITION_SIZE),$(hide) echo "system_size=$(BOARD_SYSTEMIMAGE_PARTITION_SIZE)" >> $(1))
+$(if $(BOARD_SYSTEMIMAGE_JOURNAL_SIZE),$(hide) echo "system_journal_size=$(BOARD_SYSTEMIMAGE_JOURNAL_SIZE)" >> $(1))
 $(if $(BOARD_USERDATAIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "userdata_fs_type=$(BOARD_USERDATAIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
 $(if $(BOARD_USERDATAIMAGE_PARTITION_SIZE),$(hide) echo "userdata_size=$(BOARD_USERDATAIMAGE_PARTITION_SIZE)" >> $(1))
 $(if $(BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "cache_fs_type=$(BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
 $(if $(BOARD_CACHEIMAGE_PARTITION_SIZE),$(hide) echo "cache_size=$(BOARD_CACHEIMAGE_PARTITION_SIZE)" >> $(1))
 $(if $(BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "vendor_fs_type=$(BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
 $(if $(BOARD_VENDORIMAGE_PARTITION_SIZE),$(hide) echo "vendor_size=$(BOARD_VENDORIMAGE_PARTITION_SIZE)" >> $(1))
+$(if $(BOARD_VENDORIMAGE_JOURNAL_SIZE),$(hide) echo "vendor_journal_size=$(BOARD_VENDORIMAGE_JOURNAL_SIZE)" >> $(1))
 $(if $(BOARD_OEMIMAGE_PARTITION_SIZE),$(hide) echo "oem_size=$(BOARD_OEMIMAGE_PARTITION_SIZE)" >> $(1))
+$(if $(BOARD_OEMIMAGE_JOURNAL_SIZE),$(hide) echo "oem_journal_size=$(BOARD_OEMIMAGE_JOURNAL_SIZE)" >> $(1))
 $(if $(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG),$(hide) echo "extfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG)" >> $(1))
 $(if $(mkyaffs2_extra_flags),$(hide) echo "mkyaffs2_extra_flags=$(mkyaffs2_extra_flags)" >> $(1))
 $(hide) echo "selinux_fc=$(SELINUX_FC)" >> $(1)
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index f23c4a6..92b3fc4 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -123,6 +123,7 @@
 LOCAL_RENDERSCRIPT_TARGET_API:=
 LOCAL_DEX_PREOPT:= # '',true,false,nostripping
 LOCAL_DEX_PREOPT_IMAGE_LOCATION:=
+LOCAL_DEX_PREOPT_FLAGS:=
 LOCAL_PROTOC_OPTIMIZE_TYPE:= # lite(default),micro,nano,full
 LOCAL_PROTOC_FLAGS:=
 LOCAL_PROTO_JAVA_OUTPUT_PARAMS:=
diff --git a/core/dex_preopt_libart.mk b/core/dex_preopt_libart.mk
index 5af2be2..de995b7 100644
--- a/core/dex_preopt_libart.mk
+++ b/core/dex_preopt_libart.mk
@@ -18,6 +18,10 @@
 
 PRELOADED_CLASSES := frameworks/base/preloaded-classes
 
+# Use the first compiled-classes file in PRODUCT_COPY_FILES.
+COMPILED_CLASSES := $(call word-colon,1,$(firstword \
+    $(filter %system/etc/compiled-classes,$(PRODUCT_COPY_FILES))))
+
 # start of image reserved address space
 LIBART_IMG_HOST_BASE_ADDRESS   := 0x60000000
 LIBART_IMG_TARGET_BASE_ADDRESS := 0x70000000
@@ -91,5 +95,6 @@
 	--android-root=$(PRODUCT_OUT)/system \
 	--instruction-set=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH) \
 	--instruction-set-features=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES) \
-	--include-patch-information --runtime-arg -Xnorelocate --no-include-debug-symbols
+	--include-patch-information --runtime-arg -Xnorelocate --no-include-debug-symbols \
+	$(PRIVATE_DEX_PREOPT_FLAGS)
 endef
diff --git a/core/dex_preopt_libart_boot.mk b/core/dex_preopt_libart_boot.mk
index fe4c5a4..6c6e0ad 100644
--- a/core/dex_preopt_libart_boot.mk
+++ b/core/dex_preopt_libart_boot.mk
@@ -32,6 +32,17 @@
 $(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_INSTALLED_IMAGE := $(PRODUCT_OUT)$($(my_2nd_arch_prefix)LIBART_BOOT_IMAGE_FILENAME)
 endif
 
+# Compile boot.oat as position-independent code if WITH_DEXPREOPT_PIC=true
+ifeq (true,$(WITH_DEXPREOPT_PIC))
+  PRODUCT_DEX_PREOPT_BOOT_FLAGS += --compile-pic
+endif
+
+# If we have a compiled-classes file, create a parameter.
+COMPILED_CLASSES_FLAGS :=
+ifneq ($(COMPILED_CLASSES),)
+  COMPILED_CLASSES_FLAGS := --compiled-classes=$(COMPILED_CLASSES)
+endif
+
 # The rule to install boot.art and boot.oat
 $($(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_INSTALLED_IMAGE) : $($(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME) | $(ACP)
 	$(call copy-file-to-target)
@@ -53,4 +64,5 @@
 		--image=$@ --base=$(LIBART_IMG_TARGET_BASE_ADDRESS) \
 		--instruction-set=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH) \
 		--instruction-set-features=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES) \
-		--android-root=$(PRODUCT_OUT)/system --include-patch-information --runtime-arg -Xnorelocate --no-include-debug-symbols
+		--android-root=$(PRODUCT_OUT)/system --include-patch-information --runtime-arg -Xnorelocate --no-include-debug-symbols \
+		$(PRODUCT_DEX_PREOPT_BOOT_FLAGS) $(COMPILED_CLASSES_FLAGS)
diff --git a/core/dex_preopt_odex_install.mk b/core/dex_preopt_odex_install.mk
index 741f9a3..cb38261 100644
--- a/core/dex_preopt_odex_install.mk
+++ b/core/dex_preopt_odex_install.mk
@@ -11,7 +11,12 @@
     ifndef LOCAL_DEX_PREOPT # LOCAL_DEX_PREOPT undefined
       ifneq ($(filter $(TARGET_OUT)/%,$(my_module_path)),) # Installed to system.img.
         ifeq (,$(LOCAL_APK_LIBRARIES)) # LOCAL_APK_LIBRARIES empty
-          LOCAL_DEX_PREOPT := $(DEX_PREOPT_DEFAULT)
+          # If we have product-specific config for this module?
+          ifeq (disable,$(DEXPREOPT.$(TARGET_PRODUCT).$(LOCAL_MODULE).CONFIG))
+            LOCAL_DEX_PREOPT := false
+          else
+            LOCAL_DEX_PREOPT := $(DEX_PREOPT_DEFAULT)
+          endif
         else # LOCAL_APK_LIBRARIES not empty
           LOCAL_DEX_PREOPT := nostripping
         endif # LOCAL_APK_LIBRARIES not empty
@@ -94,6 +99,20 @@
 endif  # boot jar
 
 ifdef built_odex
+ifndef LOCAL_DEX_PREOPT_FLAGS
+LOCAL_DEX_PREOPT_FLAGS := $(DEXPREOPT.$(TARGET_PRODUCT).$(LOCAL_MODULE).CONFIG)
+ifndef LOCAL_DEX_PREOPT_FLAGS
+LOCAL_DEX_PREOPT_FLAGS := $(PRODUCT_DEX_PREOPT_DEFAULT_FLAGS)
+endif
+endif
+
+# Compile apps with position-independent code if WITH_DEXPREOPT_PIC=true
+ifeq (true,$(WITH_DEXPREOPT_PIC))
+  LOCAL_DEX_PREOPT_FLAGS += --compile-pic
+endif
+
+$(built_odex): PRIVATE_DEX_PREOPT_FLAGS := $(LOCAL_DEX_PREOPT_FLAGS)
+
 # Use pattern rule - we may have multiple installed odex files.
 # Ugly syntax - See the definition get-odex-file-path.
 $(installed_odex) : $(dir $(LOCAL_INSTALLED_MODULE))%$(notdir $(word 1,$(installed_odex))) \
diff --git a/core/product.mk b/core/product.mk
index 0075acd..ed906cb 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -100,14 +100,18 @@
     PRODUCT_FACTORY_BUNDLE_MODULES \
     PRODUCT_RUNTIMES \
     PRODUCT_BOOT_JARS \
-    PRODUCT_DEX_PREOPT_IMAGE_IN_DATA \
     PRODUCT_SUPPORTS_VERITY \
     PRODUCT_OEM_PROPERTIES \
     PRODUCT_SYSTEM_PROPERTY_BLACKLIST \
     PRODUCT_SYSTEM_SERVER_JARS \
     PRODUCT_VERITY_SIGNING_KEY \
     PRODUCT_SYSTEM_VERITY_PARTITION \
-    PRODUCT_VENDOR_VERITY_PARTITION
+    PRODUCT_VENDOR_VERITY_PARTITION \
+    PRODUCT_DEX_PREOPT_IMAGE_IN_DATA \
+    PRODUCT_DEX_PREOPT_MODULE_CONFIGS \
+    PRODUCT_DEX_PREOPT_DEFAULT_FLAGS \
+    PRODUCT_DEX_PREOPT_BOOT_FLAGS \
+
 
 define dump-product
 $(info ==== $(1) ====)\
@@ -299,3 +303,14 @@
 define add-to-product-copy-files-if-exists
 $(if $(wildcard $(word 1,$(subst :, ,$(1)))),$(1))
 endef
+
+# whitespace placeholder when we record module's dex-preopt config.
+_PDPMC_SP_PLACE_HOLDER := |@SP@|
+# Set up dex-preopt config for a module.
+# $(1) list of module names
+# $(2) the modules' dex-preopt config
+define add-product-dex-preopt-module-config
+$(eval _c := $(subst $(space),$(_PDPMC_SP_PLACE_HOLDER),$(strip $(2))))\
+$(eval PRODUCT_DEX_PREOPT_MODULE_CONFIGS += \
+  $(foreach m,$(1),$(m)=$(_c)))
+endef
diff --git a/core/product_config.mk b/core/product_config.mk
index 32e351c..d4ba364 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -416,3 +416,21 @@
 # If there is no room in /system for the image, place it in /data
 PRODUCT_DEX_PREOPT_IMAGE_IN_DATA := \
     $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_DEX_PREOPT_IMAGE_IN_DATA))
+
+PRODUCT_DEX_PREOPT_DEFAULT_FLAGS := \
+    $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_DEX_PREOPT_DEFAULT_FLAGS))
+PRODUCT_DEX_PREOPT_BOOT_FLAGS := \
+    $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_DEX_PREOPT_BOOT_FLAGS))
+# Resolve and setup per-module dex-preopot configs.
+PRODUCT_DEX_PREOPT_MODULE_CONFIGS := \
+    $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_DEX_PREOPT_MODULE_CONFIGS))
+# If a module has multiple setups, the first takes precedence.
+_pdpmc_modules :=
+$(foreach c,$(PRODUCT_DEX_PREOPT_MODULE_CONFIGS),\
+  $(eval m := $(firstword $(subst =,$(space),$(c))))\
+  $(if $(filter $(_pdpmc_modules),$(m)),,\
+    $(eval _pdpmc_modules += $(m))\
+    $(eval cf := $(patsubst $(m)=%,%,$(c)))\
+    $(eval cf := $(subst $(_PDPMC_SP_PLACE_HOLDER),$(space),$(cf)))\
+    $(eval DEXPREOPT.$(TARGET_PRODUCT).$(m).CONFIG := $(cf))))
+_pdpmc_modules :=
diff --git a/target/product/base.mk b/target/product/base.mk
index 9713330..28877c5 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -115,4 +115,10 @@
     wm
 
 
+# Note: it is acceptable to not have a compiled-classes file. In that case, all boot classpath
+#       classes will be compiled.
+PRODUCT_COPY_FILES += $(call add-to-product-copy-files-if-exists,\
+    frameworks/base/compiled-classes:system/etc/compiled-classes)
+
+
 $(call inherit-product, $(SRC_TARGET_DIR)/product/embedded.mk)
diff --git a/target/product/core.mk b/target/product/core.mk
index 876a536..519dbb8 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -15,9 +15,10 @@
 #
 
 # Base configuration for communication-oriented android devices
-# (phones, tablets, etc.).  If you want a change to apply to ALL
+# (phones, tablets, etc.).  If you want a change to apply to ALMOST ALL
 # devices (including non-phones and non-tablets), modify
-# core_minimal.mk instead.
+# core_minimal.mk instead. If you care about wearables, you need to modify
+# core_tiny.mk in addition to core_minimal.mk.
 
 PRODUCT_PACKAGES += \
     BasicDreams \
diff --git a/target/product/core_tiny.mk b/target/product/core_tiny.mk
index d6dbe98..9637e34 100644
--- a/target/product/core_tiny.mk
+++ b/target/product/core_tiny.mk
@@ -43,6 +43,7 @@
     DefaultContainerService \
     SettingsProvider \
     Shell \
+    bcc \
     bu \
     com.android.location.provider \
     com.android.location.provider.xml \
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index a010e84..5d87864 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -240,6 +240,8 @@
     build_command.extend([in_dir, out_file, fs_type,
                           prop_dict["mount_point"]])
     build_command.append(prop_dict["partition_size"])
+    if "journal_size" in prop_dict:
+      build_command.extend(["-j", prop_dict["journal_size"]])
     if "timestamp" in prop_dict:
       build_command.extend(["-T", str(prop_dict["timestamp"])])
     if fs_config is not None:
@@ -319,6 +321,7 @@
   if mount_point == "system":
     copy_prop("fs_type", "fs_type")
     copy_prop("system_size", "partition_size")
+    copy_prop("system_journal_size", "journal_size")
     copy_prop("system_verity_block_device", "verity_block_device")
   elif mount_point == "data":
     # Copy the generic fs type first, override with specific one if available.
@@ -331,10 +334,12 @@
   elif mount_point == "vendor":
     copy_prop("vendor_fs_type", "fs_type")
     copy_prop("vendor_size", "partition_size")
+    copy_prop("vendor_journal_size", "journal_size")
     copy_prop("vendor_verity_block_device", "verity_block_device")
   elif mount_point == "oem":
     copy_prop("fs_type", "fs_type")
     copy_prop("oem_size", "partition_size")
+    copy_prop("oem_journal_size", "journal_size")
 
   return d
 
diff --git a/tools/releasetools/edify_generator.py b/tools/releasetools/edify_generator.py
index 7d318a3..e52c264 100644
--- a/tools/releasetools/edify_generator.py
+++ b/tools/releasetools/edify_generator.py
@@ -201,6 +201,17 @@
     """Log a message to the screen (if the logs are visible)."""
     self.script.append('ui_print("%s");' % (message,))
 
+  def TunePartition(self, partition, *options):
+    fstab = self.info.get("fstab", None)
+    if fstab:
+      p = fstab[partition]
+      if (p.fs_type not in ( "ext2", "ext3", "ext4")):
+        raise ValueError("Partition %s cannot be tuned\n" % (partition,))
+    self.script.append('tune2fs(' +
+                       "".join(['"%s", ' % (i,) for i in options]) +
+                       '"%s") || abort("Failed to tune partition %s");'
+                       % ( p.device,partition));
+
   def FormatPartition(self, partition):
     """Format the given partition, specified by its mount point (eg,
     "/system")."""