Process 'system/bin/installd' causing memory leak
/system/bin/installd is a system daemon that is involved in the installation of applications. System classes like PackageInstaller use it in their execution.

This article from DZone dates back to 2013, but it gives some pointers that can put on track:


  PackageInstaller is the default application for Android to interactively install a normal package. PackageInstaller provide user interface to manage applications/packages. PackageInstaller calls InstallAppProgress activity to receive instructions from the user. InstallAppProgress will ask Package Manager Service to install package via installd. Source code is available at  /packages/apps/PackageInstaller.


Today's Android code states (for example: services/core/java/com/android/server/pm/Installer.java):

 public void onStart() {
    Slog.i(TAG, "Waiting for installd to be ready.");
    mInstaller.waitForConnection();
}


The same file comments on checking out frameworks/native/cmds/installd/installd.h (I did not look further for now).

In short, you may need to look at the source code to know more about installd, depending on what you are up to.