Merge "Replace hardcoded cgroup paths"

core/jni/android_util_Process.cpp

@@ -346,30 +346,34 @@ static void parse_cpuset_cpus(char *cpus, cpu_set_t *cpu_set) {
 static void get_cpuset_cores_for_policy(SchedPolicy policy, cpu_set_t *cpu_set)
 {
     FILE *file;
-    const char *filename;
+    std::string filename;
 
     CPU_ZERO(cpu_set);
 
     switch (policy) {
         case SP_BACKGROUND:
-            filename = "/dev/cpuset/background/cpus";
+            if (!CgroupGetAttributePath("LowCapacityCPUs", &filename)) {
+                return;
+            }
             break;
         case SP_FOREGROUND:
         case SP_AUDIO_APP:
         case SP_AUDIO_SYS:
         case SP_RT_APP:
-            filename = "/dev/cpuset/foreground/cpus";
+            if (!CgroupGetAttributePath("HighCapacityCPUs", &filename)) {
+                return;
+            }
             break;
         case SP_TOP_APP:
-            filename = "/dev/cpuset/top-app/cpus";
+            if (!CgroupGetAttributePath("MaxCapacityCPUs", &filename)) {
+                return;
+            }
             break;
         default:
-            filename = NULL;
+            return;
     }
 
-    if (!filename) return;
-
-    file = fopen(filename, "re");
+    file = fopen(filename.c_str(), "re");
     if (file != NULL) {
         // Parse cpus string
         char *line = NULL;
@@ -379,7 +383,7 @@ static void get_cpuset_cores_for_policy(SchedPolicy policy, cpu_set_t *cpu_set)
         if (num_read > 0) {
             parse_cpuset_cpus(line, cpu_set);
         } else {
-            ALOGE("Failed to read %s", filename);
+            ALOGE("Failed to read %s", filename.c_str());
         }
         free(line);
     }

core/jni/com_android_internal_os_Zygote.cpp

@@ -1305,15 +1305,12 @@ static jint com_android_internal_os_Zygote_nativeForkSystemServer(
           RuntimeAbort(env, __LINE__, "System server process has died. Restarting Zygote!");
       }
 
-      bool low_ram_device = GetBoolProperty("ro.config.low_ram", false);
-      bool per_app_memcg = GetBoolProperty("ro.config.per_app_memcg", low_ram_device);
-      if (per_app_memcg) {
+      if (UsePerAppMemcg()) {
           // Assign system_server to the correct memory cgroup.
-          // Not all devices mount /dev/memcg so check for the file first
+          // Not all devices mount memcg so check if it is mounted first
           // to avoid unnecessarily printing errors and denials in the logs.
-          if (!access("/dev/memcg/system/tasks", F_OK) &&
-                !WriteStringToFile(StringPrintf("%d", pid), "/dev/memcg/system/tasks")) {
-              ALOGE("couldn't write %d to /dev/memcg/system/tasks", pid);
+          if (!SetTaskProfiles(pid, std::vector<std::string>{"SystemMemoryProcess"})) {
+              ALOGE("couldn't add process %d into system memcg group", pid);
           }
       }
   }

media/jni/Android.bp

@@ -51,6 +51,7 @@ cc_library_shared {
         "libmtp",
         "libexif",
         "libpiex",
+        "libprocessgroup",
         "libandroidfw",
         "libhidlallocatorutils",
         "libhidlbase",
@@ -131,6 +132,7 @@ cc_library_shared {
         "libcutils",
         "libdexfile",
         "liblzma",
+        "libjsoncpp",
         "libmedia_helper",
         "libmedia_player2_util",
         "libmediadrm",
@@ -140,6 +142,7 @@ cc_library_shared {
         "libmediautils",
         "libnativehelper",
         "libnetd_client",
+        "libprocessgroup",
         "libstagefright_esds",
         "libstagefright_foundation",
         "libstagefright_httplive",