Add total DMA-BUF heap pool size information to dumpsys meminfo

Some DMA-BUF heaps maintain pools of pre-zeroed memory for faster
allocations. Print the total size of all DMA-BUF heap pools as part of
dumpsys meminfo and use the same in LostRam calculation.

Test: dumpsys meminfo
Bug: 167709539
Change-Id: Ifb61fe596c1a8fab1bd536ec904285e532629b71
Merged-In: Ifb61fe596c1a8fab1bd536ec904285e532629b71

3 files changed, 42 insertions, 2 deletions

diff --git a/core/java/android/os/Debug.java b/core/java/android/os/Debug.java
index 5b2bef31d1ed..c82149e390ba 100644
--- a/core/java/android/os/Debug.java
+++ b/core/java/android/os/Debug.java
@@ -2567,6 +2567,14 @@ public final class Debug
     public static native long getIonHeapsSizeKb();
 
     /**
+     * Return memory size in kilobytes allocated for DMA-BUF heap pools or -1 if
+     * /sys/kernel/dma_heap/total_pools_kb could not be read.
+     *
+     * @hide
+     */
+    public static native long getDmabufHeapPoolsSizeKb();
+
+    /**
      * Return memory size in kilobytes allocated for ION pools or -1 if
      * /sys/kernel/ion/total_pools_kb could not be read.
      *
diff --git a/core/jni/android_os_Debug.cpp b/core/jni/android_os_Debug.cpp
index e0a3f2a398c7..2a93b4629e27 100644
--- a/core/jni/android_os_Debug.cpp
+++ b/core/jni/android_os_Debug.cpp
@@ -824,6 +824,17 @@ static jlong android_os_Debug_getIonPoolsSizeKb(JNIEnv* env, jobject clazz) {
     return poolsSizeKb;
 }
 
+static jlong android_os_Debug_getDmabufHeapPoolsSizeKb(JNIEnv* env, jobject clazz) {
+    jlong poolsSizeKb = -1;
+    uint64_t size;
+
+    if (meminfo::ReadDmabufHeapPoolsSizeKb(&size)) {
+        poolsSizeKb = size;
+    }
+
+    return poolsSizeKb;
+}
+
 static jlong android_os_Debug_getDmabufMappedSizeKb(JNIEnv* env, jobject clazz) {
     jlong dmabufPss = 0;
     std::vector<dmabufinfo::DmaBuffer> dmabufs;
@@ -936,6 +947,8 @@ static const JNINativeMethod gMethods[] = {
             (void*)android_os_Debug_getIonPoolsSizeKb },
     { "getDmabufMappedSizeKb", "()J",
             (void*)android_os_Debug_getDmabufMappedSizeKb },
+    { "getDmabufHeapPoolsSizeKb", "()J",
+            (void*)android_os_Debug_getDmabufHeapPoolsSizeKb },
     { "getGpuTotalUsageKb", "()J",
             (void*)android_os_Debug_getGpuTotalUsageKb },
     { "isVmapStack", "()Z",
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 97ad99595de0..be53adc82a2c 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -13756,14 +13756,23 @@ public class ActivityManagerService extends IActivityManager.Stub
                     pw.print(" mapped + ");
                     pw.print(stringifyKBSize(dmabufUnmapped));
                     pw.println(" unmapped)");
-                    // TODO(b/167709539): also add pooled memory from DMA-BUF heaps
                     kernelUsed += totalExportedDmabuf;
                 }
+                final long totalDmabufHeapPool = Debug.getDmabufHeapPoolsSizeKb();
+                if (totalDmabufHeapPool >= 0) {
+                    pw.print("DMA-BUF Heaps pool: ");
+                    pw.println(stringifyKBSize(totalDmabufHeapPool));
+                }
             }
             final long gpuUsage = Debug.getGpuTotalUsageKb();
             if (gpuUsage >= 0) {
                 pw.print("      GPU: "); pw.println(stringifyKBSize(gpuUsage));
             }
+
+            /*
+             * Note: ION/DMA-BUF heap pools are reclaimable and hence, they are included as part of
+             * memInfo.getCachedSizeKb().
+             */
             final long lostRAM = memInfo.getTotalSizeKb() - (totalPss - totalSwapPss)
                     - memInfo.getFreeSizeKb() - memInfo.getCachedSizeKb()
                     - kernelUsed - memInfo.getZramTotalSizeKb();
@@ -14575,9 +14584,14 @@ public class ActivityManagerService extends IActivityManager.Stub
                 memInfoBuilder.append("DMA-BUF: ");
                 memInfoBuilder.append(stringifyKBSize(totalExportedDmabuf));
                 memInfoBuilder.append("\n");
-                // TODO(b/167709539): also add pooled memory from DMA-BUF heaps
                 kernelUsed += totalExportedDmabuf;
             }
+            final long totalDmabufHeapPool = Debug.getDmabufHeapPoolsSizeKb();
+            if (totalDmabufHeapPool >= 0) {
+                memInfoBuilder.append("DMA-BUF Heaps pool: ");
+                memInfoBuilder.append(stringifyKBSize(totalDmabufHeapPool));
+                memInfoBuilder.append("\n");
+            }
         }
 
         final long gpuUsage = Debug.getGpuTotalUsageKb();
@@ -14590,6 +14604,11 @@ public class ActivityManagerService extends IActivityManager.Stub
         memInfoBuilder.append(stringifyKBSize(
                                   totalPss - cachedPss + kernelUsed));
         memInfoBuilder.append("\n");
+
+        /*
+         * Note: ION/DMA-BUF heap pools are reclaimable and hence, they are included as part of
+         * memInfo.getCachedSizeKb().
+         */
         memInfoBuilder.append("  Lost RAM: ");
         memInfoBuilder.append(stringifyKBSize(memInfo.getTotalSizeKb()
                 - (totalPss - totalSwapPss) - memInfo.getFreeSizeKb() - memInfo.getCachedSizeKb()