tree 9a9ca02164dfb2c13afaa38ab67f3f15d8dd5ce8
parent 7d55718b0c19ba611241c330f688ee824e9bab79
author Markus Metzger <markus.t.metzger@intel.com> 1227600085 +0100
committer Ingo Molnar <mingo@elte.hu> 1227630671 +0100

x86, bts: base in-kernel ds interface on handles

Impact: generalize the DS code to shared buffers

Change the in-kernel ds.h interface to identify the tracer via a
handle returned on ds_request_~().

Tracers used to be identified via their task_struct.

The changes are required to allow DS to be shared between different
tasks, which is needed for perfmon2 and for ftrace.

For ptrace, the handle is stored in the traced task's task_struct.
This should probably go into a (arch-specific) ptrace context some
time.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>