ZRAM

ZRAM是linux的一种内存优化技术，基本工作原理是：通过划定一片区域，将压缩过后的硬盘数据放入该区域，以实现高速读取。

Solution I:
1.
enable 
+CONFIG_ZRAM=y
+CONFIG_ZSMALLOC=y
in /arch/arm/configs/msm8xxx-perf_defconfig and /arch/arm/configs/msm8226_defconfig
2.
把busybox build到userdata image里面，并且指定目录：/data/busybox
busybox在附件中
3.
--- a/rootdir/etc/init.qcom.early_boot.sh
+++ b/rootdir/etc/init.qcom.early_boot.sh
@@ -136,6 +136,10 @@ case "$1" in
         case "$soc_hwplatform" in
             *)
                 setprop ro.sf.lcd_density 320
+   chmod 755 /data/busybox/busybox
+                echo $((256*1024*1024)) > /sys/block/zram0/disksize
+                /data/busybox/busybox mkswap /dev/block/zram0
+                /data/busybox/busybox swapon /dev/block/zram0
                 ;;
         esac
4. then check /proc/meminfo
    if SwapTotal:        262140 kB, zram work well.
         
solution II：
1.
enable 
+CONFIG_ZRAM=y
+CONFIG_ZSMALLOC=y
in /arch/arm/configs/msm8xxx-perf_defconfig and /arch/arm/configs/msm8226_defconfig

2. push busybox to  /data folder
3. adb shell 
   cd data
   chmod 755 /data/busybox
   echo $((256*1024*1024)) > /sys/block/zram0/disksize
   ./busybox mkswap /dev/block/zram0
   ./busybox swapon /dev/block/zram0
4. then check /proc/meminfo
    if SwapTotal:        262140 kB, zram work well.