Add JNI API to query sizes of ION heaps, pools and mapped part of the heaps

Provide means for system_server to query ION memory usage. The new API
allows to get total size of ION heaps, pools and part of ION heaps that
is mapped into user space.

Bug: 138148041
Test: dumpsys meminfo
Change-Id: I6d76d534bbab5ee1646e8e3e3fe5210dcf76bc23
Signed-off-by: Suren Baghdasaryan <surenb@google.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/core/java/android/os/Debug.java b/core/java/android/os/Debug.java
index e34b5238aee5..9b707484cfe0 100644
--- a/core/java/android/os/Debug.java
+++ b/core/java/android/os/Debug.java
@@ -2567,4 +2567,27 @@ public final class Debug
      * @hide
      */
     public static native long getZramFreeKb();
+
+    /**
+     * Return memory size in kilobytes allocated for ION heaps.
+     *
+     * @hide
+     */
+    public static native long getIonHeapsSizeKb();
+
+    /**
+     * Return memory size in kilobytes allocated for ION pools.
+     *
+     * @hide
+     */
+    public static native long getIonPoolsSizeKb();
+
+    /**
+     * Return ION memory mapped by processes in kB.
+     * Notes:
+     *  * Warning: Might impact performance as it reads /proc/<pid>/maps files for each process.
+     *
+     * @hide
+     */
+    public static native long getIonMappedSizeKb();
 }