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| author | Steven Rostedt <srostedt@redhat.com> | 2012-05-04 05:09:03 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-03-15 05:34:40 +0100 |
| commit | ae63b31e4d0e2ec09c569306ea46f664508ef717 (patch) | |
| tree | 0d40e8fddca53d1776254cd92fc73bc4413ee1f5 /kernel/trace/trace.c | |
| parent | tracing: Prevent buffer overwrite disabled for latency tracers (diff) | |
| download | linux-ae63b31e4d0e2ec09c569306ea46f664508ef717.tar.xz linux-ae63b31e4d0e2ec09c569306ea46f664508ef717.zip | |
tracing: Separate out trace events from global variables
The trace events for ftrace are all defined via global variables.
The arrays of events and event systems are linked to a global list.
This prevents multiple users of the event system (what to enable and
what not to).
By adding descriptors to represent the event/file relation, as well
as to which trace_array descriptor they are associated with, allows
for more than one set of events to be defined. Once the trace events
files have a link between the trace event and the trace_array they
are associated with, we can create multiple trace_arrays that can
record separate events in separate buffers.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 4f1dade56981..932931897b8d 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -189,6 +189,8 @@ unsigned long long ns2usecs(cycle_t nsec) */ static struct trace_array global_trace; +LIST_HEAD(ftrace_trace_arrays); + static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); int filter_current_check_discard(struct ring_buffer *buffer, @@ -5359,6 +5361,12 @@ __init static int tracer_alloc_buffers(void) register_die_notifier(&trace_die_notifier); + global_trace.flags = TRACE_ARRAY_FL_GLOBAL; + + INIT_LIST_HEAD(&global_trace.systems); + INIT_LIST_HEAD(&global_trace.events); + list_add(&global_trace.list, &ftrace_trace_arrays); + while (trace_boot_options) { char *option; |