From ecd0b35267673689da0bc188ffa788cb6a13d57c Mon Sep 17 00:00:00 2001
From: Randall Huang <huangrandall@google.com>
Date: Thu, 22 Sep 2022 20:06:12 +0100
Subject: [PATCH] rosemary: Enable ZRAM-writeback job This patch enables
 zram-writeback job. It will run idle marking at 60m since the device is boot.
 After that, it will do first writeback after 3hour to sweep initiallized cold
 pages out. After that, it periodically write out every 24hour.

Bug: 117682284
Bug: 127185055
Test: confirm with manual testing

Signed-off-by: Randall Huang <huangrandall@google.com>
Change-Id: I6857c79ca3ce6a3619f4b7e200d7f17a8decd659
---
 overlay/frameworks/base/core/res/res/values/config.xml | 3 +++
 system.prop                                            | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index 4159622..7b031b6 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -435,6 +435,9 @@
       <item>0:2:15</item>
     </string-array>
 
+    <!-- Enable Zram writeback feature to allow unused pages in zram be written to flash. -->
+    <bool name="config_zramWriteback">true</bool>
+
     <!-- The bounding path of the cutout region of the main built-in display.
          Must either be empty if there is no cutout region, or a string that is parsable by
          {@link android.util.PathParser}.
diff --git a/system.prop b/system.prop
index b18739e..1360ca6 100644
--- a/system.prop
+++ b/system.prop
@@ -71,3 +71,8 @@ ro.mediatek.wlan.p2p=1
 mediatek.wlan.ctia=0
 wifi.tethering.interface=ap0
 wifi.direct.interface=p2p0
+
+# ZRAM
+ro.zram.mark_idle_delay_mins=60
+ro.zram.first_wb_delay_mins=180
+ro.zram.periodic_wb_delay_hours=24