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tracing: let user specify tracing_thresh after selecting function_graph

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Currently, tracing_thresh works only if we specify it before selecting
function_graph tracer. If we do the opposite, tracing_thresh will change
it's value, but it will not be applied.
To fix it, we add update_thresh callback which is called whenever
tracing_thresh is updated and for function_graph tracer we register
handler which reinitializes tracer depending on tracing_thresh.

Link: http://lkml.kernel.org/p/20140718111727.GA3206@stfomichev-desktop.yandex.net

Signed-off-by: Stanislav Fomichev <stfomichev@yandex-team.ru>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Stanislav Fomichev 2014-07-18 15:17:27 +04:00 • committed by Steven Rostedt
parent 021c5b3445
commit 6508fa761c
3 changed files with 67 additions and 7 deletions
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7
kernel/trace/trace_functions_graph.c
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@ -475,6 +475,12 @@ static void graph_trace_reset(struct trace_array *tr)
unregister_ftrace_graph();
}
int graph_trace_update_thresh(struct trace_array *tr)
{
graph_trace_reset(tr);
return graph_trace_init(tr);
}
static int max_bytes_for_cpu;
static enum print_line_t
@ -1525,6 +1531,7 @@ static struct trace_event graph_trace_ret_event = {
static struct tracer graph_trace __tracer_data = {
.name = "function_graph",
.update_thresh = graph_trace_update_thresh,
.open = graph_trace_open,
.pipe_open = graph_trace_open,
.close = graph_trace_close,