Provide VM.events diagnostic command

Summary

Add a VM.events command to jcmd to display event logs.

Problem

Event logs are a valuable problem analysis tool. Right now the only way to see them is via hs-err file in case the VM died, or as part of the VM.info output.

Solution

Add a command to jcmd to print out event logs. The proposed name is "VM.events".

It should have the following features:

• ability to select a single event log (by default, all should be printed)

• ability to limit the number of printed events (by default, all events in the selected event log should be printed)

Specification

VM.events [log="log name"] [max="number"]

optional option log=.. would select for a single named event log.
optional option max=.. would limit the number of events printed.

Events shall be printed in chronological reverse order (youngest events first).