Add total GPU usage report into dumpsys meminfo output

With latest kernel changes, total GPU memory usage is reported and can
be obtained via a BPF program. Create JNI interface to query it and
report inside dumpsys meminfo output.

Bug: 171261987
Test: dumpsys meminfo
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I949a13836d5b5bc87fc43f60871b4fbf2add6480

core/java/android/os/Debug.java

@@ -2581,6 +2581,13 @@ public final class Debug
      */
     public static native long getIonMappedSizeKb();
 
+    /**
+     * Return memory size in kilobytes used by GPU.
+     *
+     * @hide
+     */
+    public static native long getGpuTotalUsageKb();
+
     /**
      * Return whether virtually-mapped kernel stacks are enabled (CONFIG_VMAP_STACK).
      * Note: caller needs config_gz read sepolicy permission

core/jni/android_os_Debug.cpp

@@ -847,6 +847,17 @@ static jlong android_os_Debug_getIonMappedSizeKb(JNIEnv* env, jobject clazz) {
     return ionPss;
 }
 
+static jlong android_os_Debug_getGpuTotalUsageKb(JNIEnv* env, jobject clazz) {
+    jlong sizeKb = -1;
+    uint64_t size;
+
+    if (meminfo::ReadGpuTotalUsageKb(&size)) {
+        sizeKb = size;
+    }
+
+    return sizeKb;
+}
+
 static jboolean android_os_Debug_isVmapStack(JNIEnv *env, jobject clazz)
 {
     static enum {
@@ -915,6 +926,8 @@ static const JNINativeMethod gMethods[] = {
             (void*)android_os_Debug_getIonPoolsSizeKb },
     { "getIonMappedSizeKb", "()J",
             (void*)android_os_Debug_getIonMappedSizeKb },
+    { "getGpuTotalUsageKb", "()J",
+            (void*)android_os_Debug_getGpuTotalUsageKb },
     { "isVmapStack", "()Z",
             (void*)android_os_Debug_isVmapStack },
 };

services/core/java/com/android/server/am/ActivityManagerService.java

@@ -11247,6 +11247,10 @@ public class ActivityManagerService extends IActivityManager.Stub
                 // set on ION VMAs, therefore consider the entire ION heap as used kernel memory
                 kernelUsed += ionHeap;
             }
+            final long gpuUsage = Debug.getGpuTotalUsageKb();
+            if (gpuUsage >= 0) {
+                pw.print("      GPU: "); pw.println(stringifyKBSize(gpuUsage));
+            }
             final long lostRAM = memInfo.getTotalSizeKb()
                     - (ss[INDEX_TOTAL_PSS] - ss[INDEX_TOTAL_SWAP_PSS])
                     - memInfo.getFreeSizeKb() - memInfo.getCachedSizeKb()
@@ -12041,6 +12045,12 @@ public class ActivityManagerService extends IActivityManager.Stub
             // set on ION VMAs, therefore consider the entire ION heap as used kernel memory
             kernelUsed += ionHeap;
         }
+        final long gpuUsage = Debug.getGpuTotalUsageKb();
+        if (gpuUsage >= 0) {
+            memInfoBuilder.append("       GPU: ");
+            memInfoBuilder.append(stringifyKBSize(gpuUsage));
+            memInfoBuilder.append("\n");
+        }
         memInfoBuilder.append("  Used RAM: ");
         memInfoBuilder.append(stringifyKBSize(
                                   totalPss - cachedPss + kernelUsed));