From 50fd822149d305b8fb53f2d9f650bb246acaf0ae Mon Sep 17 00:00:00 2001
From: "T.J. Mercier" <tjmercier@google.com>
Date: Fri, 4 Oct 2024 14:53:27 +0000
Subject: [PATCH] init: Remove schedtune support

Schedtune was an out of tree cgroup controller present in Android
kernels up to 4.19. It was replaced with uclamp and the cpu controller.
Now that 4.19 is EOL and unsupported, and schedtune is not present in
any supported Android kernels, remove the userspace support for
schedtune.

Bug: 362504801
Change-Id: Iab7b7295d1fb443209d5868ac5c65dca0aabfbab
---
 init/service_parser.cpp |  3 ---
 rootdir/init.rc         | 49 -----------------------------------------
 2 files changed, 52 deletions(-)

diff --git a/init/service_parser.cpp b/init/service_parser.cpp
index e6f3af617..ec3b176d4 100644
--- a/init/service_parser.cpp
+++ b/init/service_parser.cpp
@@ -538,12 +538,9 @@ Result<void> ServiceParser::ParseUser(std::vector<std::string>&& args) {
 // when we migrate to cgroups v2 while these hardcoded paths stay the same.
 static std::optional<const std::string> ConvertTaskFileToProfile(const std::string& file) {
     static const std::map<const std::string, const std::string> map = {
-            {"/dev/stune/top-app/tasks", "MaxPerformance"},
-            {"/dev/stune/foreground/tasks", "HighPerformance"},
             {"/dev/cpuset/camera-daemon/tasks", "CameraServiceCapacity"},
             {"/dev/cpuset/foreground/tasks", "ProcessCapacityHigh"},
             {"/dev/cpuset/system-background/tasks", "ServiceCapacityLow"},
-            {"/dev/stune/nnapi-hal/tasks", "NNApiHALPerformance"},
             {"/dev/blkio/background/tasks", "LowIoPriority"},
     };
     auto iter = map.find(file);
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 1acd63774..c8b725d1e 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -112,37 +112,6 @@ on init
     # Create socket dir for ot-daemon
     mkdir /dev/socket/ot-daemon 0770 thread_network thread_network
 
-    # Create energy-aware scheduler tuning nodes
-    mkdir /dev/stune/foreground
-    mkdir /dev/stune/background
-    mkdir /dev/stune/top-app
-    mkdir /dev/stune/rt
-    chown system system /dev/stune
-    chown system system /dev/stune/foreground
-    chown system system /dev/stune/background
-    chown system system /dev/stune/top-app
-    chown system system /dev/stune/rt
-    chown system system /dev/stune/tasks
-    chown system system /dev/stune/foreground/tasks
-    chown system system /dev/stune/background/tasks
-    chown system system /dev/stune/top-app/tasks
-    chown system system /dev/stune/rt/tasks
-    chown system system /dev/stune/cgroup.procs
-    chown system system /dev/stune/foreground/cgroup.procs
-    chown system system /dev/stune/background/cgroup.procs
-    chown system system /dev/stune/top-app/cgroup.procs
-    chown system system /dev/stune/rt/cgroup.procs
-    chmod 0664 /dev/stune/tasks
-    chmod 0664 /dev/stune/foreground/tasks
-    chmod 0664 /dev/stune/background/tasks
-    chmod 0664 /dev/stune/top-app/tasks
-    chmod 0664 /dev/stune/rt/tasks
-    chmod 0664 /dev/stune/cgroup.procs
-    chmod 0664 /dev/stune/foreground/cgroup.procs
-    chmod 0664 /dev/stune/background/cgroup.procs
-    chmod 0664 /dev/stune/top-app/cgroup.procs
-    chmod 0664 /dev/stune/rt/cgroup.procs
-
     # cpuctl hierarchy for devices using utilclamp
     mkdir /dev/cpuctl/foreground
     mkdir /dev/cpuctl/foreground_window
@@ -216,24 +185,6 @@ on init
     chmod 0664 /dev/cpuctl/camera-daemon/tasks
     chmod 0664 /dev/cpuctl/camera-daemon/cgroup.procs
 
-    # Create an stune group for camera-specific processes
-    mkdir /dev/stune/camera-daemon
-    chown system system /dev/stune/camera-daemon
-    chown system system /dev/stune/camera-daemon/tasks
-    chown system system /dev/stune/camera-daemon/cgroup.procs
-    chmod 0664 /dev/stune/camera-daemon/tasks
-    chmod 0664 /dev/stune/camera-daemon/cgroup.procs
-
-    # Create an stune group for NNAPI HAL processes
-    mkdir /dev/stune/nnapi-hal
-    chown system system /dev/stune/nnapi-hal
-    chown system system /dev/stune/nnapi-hal/tasks
-    chown system system /dev/stune/nnapi-hal/cgroup.procs
-    chmod 0664 /dev/stune/nnapi-hal/tasks
-    chmod 0664 /dev/stune/nnapi-hal/cgroup.procs
-    write /dev/stune/nnapi-hal/schedtune.boost 1
-    write /dev/stune/nnapi-hal/schedtune.prefer_idle 1
-
     # Create blkio group and apply initial settings.
     # This feature needs kernel to support it, and the
     # device's init.rc must actually set the correct values.