I don't think that we will implement that any time soon. Today we too often require more mlock-able memory than available and in this case Libgcrypt resorts to allocating new memory arenas which are not locked. This is not as worse as one might think: the majro advantage with secmem is that a free() on secmem allocated memory will also wipe that memory. A better solution has always been to use an encrypted swap/paging file. 25 years ago, it was not easy to configure but today there should be no problem and hopefully already the default.