From a40c6e1715e75a579a4740c811b26af712aed43e Mon Sep 17 00:00:00 2001
From: Li Li <dualli@google.com>
Date: Thu, 23 Mar 2023 22:50:39 -0700
Subject: [PATCH] Add log to explain why freezer is not supported

The old log is too vague to identify what's wrong with the cgroup
freezer configuration. That makes debugging unnecessarily time
consuming. Improve the log with more details.

Bug: 269312428
Test: check logcat during Android boot
Change-Id: I7c2518aef003cca990ed321e22890bddde2c5d13
---
 .../core/java/com/android/server/am/CachedAppOptimizer.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/services/core/java/com/android/server/am/CachedAppOptimizer.java b/services/core/java/com/android/server/am/CachedAppOptimizer.java
index 2617fb74cbb30..b293bcf0e17d8 100644
--- a/services/core/java/com/android/server/am/CachedAppOptimizer.java
+++ b/services/core/java/com/android/server/am/CachedAppOptimizer.java
@@ -941,11 +941,14 @@ public final class CachedAppOptimizer {
         FileReader fr = null;
 
         try {
-            fr = new FileReader(getFreezerCheckPath());
+            String path = getFreezerCheckPath();
+            Slog.d(TAG_AM, "Checking cgroup freezer: " + path);
+            fr = new FileReader(path);
             char state = (char) fr.read();
 
             if (state == '1' || state == '0') {
                 // Also check freezer binder ioctl
+                Slog.d(TAG_AM, "Checking binder freezer ioctl");
                 getBinderFreezeInfo(Process.myPid());
                 supported = true;
             } else {
@@ -967,6 +970,7 @@ public final class CachedAppOptimizer {
             }
         }
 
+        Slog.d(TAG_AM, "Freezer supported: " + supported);
         return supported;
     }