From 27db62fa49f662c5e81ca72f08b7e70d932e7fc6 Mon Sep 17 00:00:00 2001
From: Jerry Chang <chenghsiuchang@google.com>
Date: Wed, 19 Jun 2024 11:38:29 +0000
Subject: Apply input event profile to mitigate input latency of input threads

Bug: 347122505
Flag: com.android.input.flags.enable_input_policy_profile
Test: check the priority and latency of input thread in Perffeto
Change-Id: I428b9e718eace0bc39f1965d98475eebe9d3aaa5
---
 services/inputflinger/InputThread.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'services/inputflinger/InputThread.cpp')

diff --git a/services/inputflinger/InputThread.cpp b/services/inputflinger/InputThread.cpp
index e74f258168..449eb45b4b 100644
--- a/services/inputflinger/InputThread.cpp
+++ b/services/inputflinger/InputThread.cpp
@@ -16,8 +16,14 @@
 
 #include "InputThread.h"
 
+#include <android-base/logging.h>
+#include <com_android_input_flags.h>
+#include <processgroup/processgroup.h>
+
 namespace android {
 
+namespace input_flags = com::android::input::flags;
+
 namespace {
 
 // Implementation of Thread from libutils.
@@ -43,6 +49,11 @@ InputThread::InputThread(std::string name, std::function<void()> loop, std::func
       : mName(name), mThreadWake(wake) {
     mThread = sp<InputThreadImpl>::make(loop);
     mThread->run(mName.c_str(), ANDROID_PRIORITY_URGENT_DISPLAY);
+    if (input_flags::enable_input_policy_profile()) {
+        if (!applyInputEventProfile()) {
+            LOG(ERROR) << "Couldn't apply input policy profile for " << name;
+        }
+    }
 }
 
 InputThread::~InputThread() {
@@ -63,4 +74,14 @@ bool InputThread::isCallingThread() {
 #endif
 }
 
+bool InputThread::applyInputEventProfile() {
+#if defined(__ANDROID__)
+    return SetTaskProfiles(mThread->getTid(), {"InputPolicy"});
+#else
+    // Since thread information is not available and there's no benefit of
+    // applying the task profile on host, return directly.
+    return true;
+#endif
+}
+
 } // namespace android
\ No newline at end of file
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