From e09098ee3446a51f78b32096e3754250cefd95b4 Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan@google.com>
Date: Sun, 20 Feb 2022 21:39:18 -0800
Subject: [PATCH] init: gs101: improve first cma allocation latency for
 faceauth

When the system boot, migrate big mapped movable pages created by
Android boot sequence(e.g., zygote) out of cma to improve first cma
allocation. The test with cma trace shows cma allocation reduction
from 136ms to 25ms.

Test: atest com.google.android.camera.pts.SecurePreviewTest with cma
trace
Bug: 218731671
Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: Iaa2a2f8c0c3256face3ce9cd21fa4acd6fb531ea
---
 conf/init.gs101.rc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/conf/init.gs101.rc b/conf/init.gs101.rc
index 14b494b1..1260df94 100644
--- a/conf/init.gs101.rc
+++ b/conf/init.gs101.rc
@@ -687,6 +687,9 @@ on property:sys.boot_completed=1
     swapon_all /vendor/etc/fstab.${ro.board.platform}
     write /proc/sys/vm/swappiness 100
 
+    # Force empty CMA
+    write /sys/kernel/vendor_mm/cma/farawimg/force_empty 1
+
     # Back to default VM settings
     write /proc/sys/vm/dirty_expire_centisecs 3000
     write /proc/sys/vm/dirty_background_ratio 10