[PATCH V3 5/5] ARM CoreSight: ETM: Add PID control support

On Thu, Jan 30, 2014 at 04:11:10PM +0000, Adrien Verg? wrote:

In the same manner as for enabling tracing, an entry is created in
sysfs to set the PID that triggers tracing. This change is effective
only if CONFIG_PID_IN_CONTEXTIDR is set.

When using PID namespaces, the virtual PID given by the user is
converted to the globally unique ID (task_pid_nr) that is present
in the Context ID register.

Hmm, I wonder whether debugfs would be more suitable for this?

Will