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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
Download patch file Download diff file Expand all files Collapse all files

21
kernel/trace/trace_functions.c
View file

@ -574,7 +574,8 @@ static struct ftrace_probe_ops stacktrace_probe_ops = {
};
static int
ftrace_trace_probe_callback(struct ftrace_probe_ops *ops,
ftrace_trace_probe_callback(struct trace_array *tr,
struct ftrace_probe_ops *ops,
struct ftrace_hash *hash, char *glob,
char *cmd, char *param, int enable)
{
@ -612,13 +613,13 @@ ftrace_trace_probe_callback(struct ftrace_probe_ops *ops,
return ret;
out_reg:
ret = register_ftrace_function_probe(glob, ops, count);
ret = register_ftrace_function_probe(glob, tr, ops, count);
return ret < 0 ? ret : 0;
}
static int
ftrace_trace_onoff_callback(struct ftrace_hash *hash,
ftrace_trace_onoff_callback(struct trace_array *tr, struct ftrace_hash *hash,
char *glob, char *cmd, char *param, int enable)
{
struct ftrace_probe_ops *ops;
@ -629,24 +630,24 @@ ftrace_trace_onoff_callback(struct ftrace_hash *hash,
else
ops = param ? &traceoff_count_probe_ops : &traceoff_probe_ops;
return ftrace_trace_probe_callback(ops, hash, glob, cmd,
return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd,
param, enable);
}
static int
ftrace_stacktrace_callback(struct ftrace_hash *hash,
ftrace_stacktrace_callback(struct trace_array *tr, struct ftrace_hash *hash,
char *glob, char *cmd, char *param, int enable)
{
struct ftrace_probe_ops *ops;
ops = param ? &stacktrace_count_probe_ops : &stacktrace_probe_ops;
return ftrace_trace_probe_callback(ops, hash, glob, cmd,
return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd,
param, enable);
}
static int
ftrace_dump_callback(struct ftrace_hash *hash,
ftrace_dump_callback(struct trace_array *tr, struct ftrace_hash *hash,
char *glob, char *cmd, char *param, int enable)
{
struct ftrace_probe_ops *ops;
@ -654,12 +655,12 @@ ftrace_dump_callback(struct ftrace_hash *hash,
ops = &dump_probe_ops;
/* Only dump once. */
return ftrace_trace_probe_callback(ops, hash, glob, cmd,
return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd,
"1", enable);
}
static int
ftrace_cpudump_callback(struct ftrace_hash *hash,
ftrace_cpudump_callback(struct trace_array *tr, struct ftrace_hash *hash,
char *glob, char *cmd, char *param, int enable)
{
struct ftrace_probe_ops *ops;
@ -667,7 +668,7 @@ ftrace_cpudump_callback(struct ftrace_hash *hash,
ops = &cpudump_probe_ops;
/* Only dump once. */
return ftrace_trace_probe_callback(ops, hash, glob, cmd,
return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd,
"1", enable);
}