sm6150-common: Setup zram with post-boot script

* This way zram size can be optimized.

Change-Id: Ida4fca8aab88ab5af3dcba166e98cf722bab6614
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: therealmharc <therealmharc@gmail.com>

rootdir/bin/init.qcom.post_boot.sh

@@ -254,6 +254,54 @@ case "$soc_id" in
     ;;
 esac
 
+function configure_zram_parameters() {
+    MemTotalStr=`cat /proc/meminfo | grep MemTotal`
+    MemTotal=${MemTotalStr:16:8}
+
+    let RamSizeGB="( $MemTotal / 1048576 ) + 1"
+    let zRamSizeMB="( $RamSizeGB * 1024 ) / 2"
+    diskSizeUnit=M
+
+    # use MB avoid 32 bit overflow
+    if [ $zRamSizeMB -gt 4096 ]; then
+        let zRamSizeMB=4096
+    fi
+
+    echo lz4 > /sys/block/zram0/comp_algorithm
+
+    if [ -f /sys/block/zram0/disksize ]; then
+        if [ -f /sys/block/zram0/use_dedup ]; then
+            echo 1 > /sys/block/zram0/use_dedup
+        fi
+        if [ $MemTotal -le 524288 ]; then
+           echo 402653184 > /sys/block/zram0/disksize
+        elif [ $MemTotal -le 1048576 ]; then
+            echo 805306368 > /sys/block/zram0/disksize
+        else
+            zramDiskSize=$zRamSizeMB$diskSizeUnit
+            echo $zramDiskSize > /sys/block/zram0/disksize
+        fi
+
+        # ZRAM may use more memory than it saves if SLAB_STORE_USER
+        # debug option is enabled.
+        if [ -e /sys/kernel/slab/zs_handle ]; then
+            echo 0 > /sys/kernel/slab/zs_handle/store_user
+        fi
+        if [ -e /sys/kernel/slab/zspage ]; then
+            echo 0 > /sys/kernel/slab/zspage/store_user
+        fi
+
+        mkswap /dev/block/zram0
+        swapon /dev/block/zram0 -p 32758
+    fi
+}
+
+# Enable ZRAM
+configure_zram_parameters
+echo 0 > /proc/sys/vm/page-cluster
+echo 0 > /sys/module/vmpressure/parameters/allocstall_threshold
+echo 100 > /proc/sys/vm/swappiness
+
 # Enable PowerHAL hint processing
 setprop vendor.powerhal.init 1
 

rootdir/etc/fstab.zram

@@ -1,4 +0,0 @@
-# Android fstab file.
-
-#<src>                                                  <mnt_point>            <type>  <mnt_flags and options>                              <fs_mgr_flags>
-/dev/block/zram0                                        none                   swap    defaults                                             zramsize=2147483648

rootdir/etc/init.target.rc

@@ -57,10 +57,6 @@ on init
     write /sys/block/sde/queue/read_ahead_kb 2048
     write /sys/block/sde/queue/nr_requests 256
 
-    # ZRAM setup
-    write /sys/block/zram0/comp_algorithm lz4
-    write /proc/sys/vm/page-cluster 0
-
 on fs
     mount_all --early
 
@@ -132,14 +128,6 @@ on boot
     write /sys/block/sda/queue/wbt_lat_usec 75000
 
 on property:sys.boot_completed=1
-    # Set allocstall_threshold to 0
-    # Set swappiness to 60
-    write /sys/module/vmpressure/parameters/allocstall_threshold 0
-    write /proc/sys/vm/swappiness 60
-
-    # Enable ZRAM on boot_complete
-    swapon_all /vendor/etc/fstab.zram
-
     # Runtime fs tuning
     write /sys/block/sda/queue/read_ahead_kb 128
     write /sys/block/sda/queue/nr_requests 128