On Mon, 2010-01-25 at 10:29 +0530, Ananth N Mavinakayanahalli wrote: > - Extend perf; would perf then use utrace underneath? Or would one have > to redo some of what utrace already does for thread level control?
No, perf is about monitoring/tracing not modifying. Its about minimal interference, the very opposite of what ptrace/utrace is about. >From a perf POV if you need to stop a task (changing it scheduling state) you've lost. Furthermore, despite the name utrace isn't about tracing at all, its a full blown debugging infrastructure which completely multiplexes the task state, not something perf is interested in at all.
