[PATCHSET] tracing: Make event triggers affect correct instance

[Howard Cochran]

Although all of the trace event triggers can be used in instances, most
of them affect the top-level instance even when triggered from within an
instance. This patch set makes them affect the instance in which the
trigger occurred. The enable_event & disable_event triggers already work
within the correct instance, so these are unchanged.

The same problem also exists with the function probe triggers, but they
will be fixed in a later patch set.

Patch 1 is preparatory.
Patch 2 fixes the stacktrace event trigger
Patch 3 fixes the traceon & traceoff event triggers
Patch 4 fixes the snapshot event trigger
Patch 5 Makes related warning messages also go to the correct instance

 kernel/trace/trace.c                | 96 +++++++++++++++++++++++++------------
 kernel/trace/trace.h                | 14 +++++-
 kernel/trace/trace_events_trigger.c | 62 ++++++++++++++----------
 3 files changed, 113 insertions(+), 59 deletions(-)