Who are the "us-ward" of whom Peter is speaking in its context? (They are also the "any" and "all" in that verse as well)
A person might think this is directed to the saints,but God wants all people to come to repentance,for it was not directed at only the saints,for they have already repented.
Act 17:30 And the times of this ignorance God winked at; but now commandeth all men every where to repent.
God wants all people to come to repentance,so I believe when it states not willing that any perish,but all come to repentance,that is means all of mankind coming to repentance.
1Ti 2:3 For this is good and acceptable in the sight of God our Saviour;
1Ti 2:4 Who will have all men to be saved, and to come unto the knowledge of the truth.
Rev 22:17 And the Spirit and the bride say, Come. And let him that heareth say, Come. And let him that is athirst come. And whosoever will, let him take the water of life freely.
Which these scriptures state God wants all people to saved.