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tracing: Have the trace_array hold the list of registered func probes

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Add a link list to the trace_array to hold func probes that are registered.
Currently, all function probes are the same for all instances as it was
before, that is, only the top level trace_array holds the function probes.
But this lays the ground work to have function probes be attached to
individual instances, and having the event trigger only affect events in the
given instance. But that work is still to be done.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware)
2017-04-05 13:12:55 -04:00
parent 8d70725e45
commit 04ec7bb642
5 changed files with 56 additions and 30 deletions
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6
kernel/trace/trace.c
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@@ -6815,7 +6815,7 @@ static struct ftrace_probe_ops snapshot_count_probe_ops = {
};
static int
ftrace_trace_snapshot_callback(struct ftrace_hash *hash,
ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash,
char *glob, char *cmd, char *param, int enable)
{
struct ftrace_probe_ops *ops;
@@ -6855,7 +6855,7 @@ ftrace_trace_snapshot_callback(struct ftrace_hash *hash,
return ret;
out_reg:
ret = register_ftrace_function_probe(glob, ops, count);
ret = register_ftrace_function_probe(glob, tr, ops, count);
if (ret >= 0)
alloc_snapshot(&global_trace);
@@ -7468,6 +7468,8 @@ static int instance_mkdir(const char *name)
goto out_free_tr;
}
ftrace_init_trace_array(tr);
init_tracer_tracefs(tr, tr->dir);
init_trace_flags_index(tr);
__update_tracer_options(tr);