I download android 4.1.1_r1 and like to use unionfs* like fs to keep
source code clean.
However, I fount that the make time become slow when using it,
Is any suggestion that I can improve the build time?

Thanks

Below are my steps:

## Normal build

$ source build/envsetup.sh
$ lunch full-eng
$ time make -j16
real    14m35.194s

# Aufs

$ mkdir temp build
$ sudo mount -t aufs -o br=temp=rw:android-4.1.1_r1=ro none build
$ cd build
$ source build/envsetup.sh
$ lunch full-eng
$ time make -j16
real    16m9.366s

$ cd .. && sudo umount build

# cpu info
processor       : 31
vendor_id       : GenuineIntel
cpu family      : 6
model           : 45
model name      : Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz

# HDD is SAC disk

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