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authorStanislav Fomichev <stfomichev@yandex-team.ru>2014-07-18 15:17:27 +0400
committerSteven Rostedt <rostedt@goodmis.org>2014-07-18 15:48:52 -0400
commit6508fa761c330a1d2b4ae36199d08dbcb70e3ddb (patch)
treec5c76da37fddea1160d8a18ace06d89da3e20ec9 /kernel/trace/trace.h
parent021c5b34452d52e51664f09b98cd50c5495e74b6 (diff)
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op-kernel-dev-6508fa761c330a1d2b4ae36199d08dbcb70e3ddb.tar.gz
tracing: let user specify tracing_thresh after selecting function_graph
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>
Diffstat (limited to 'kernel/trace/trace.h')
-rw-r--r--kernel/trace/trace.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 9258f5a..385391f 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -339,6 +339,7 @@ struct tracer_flags {
* @reset: called when one switches to another tracer
* @start: called when tracing is unpaused (echo 1 > tracing_enabled)
* @stop: called when tracing is paused (echo 0 > tracing_enabled)
+ * @update_thresh: called when tracing_thresh is updated
* @open: called when the trace file is opened
* @pipe_open: called when the trace_pipe file is opened
* @close: called when the trace file is released
@@ -357,6 +358,7 @@ struct tracer {
void (*reset)(struct trace_array *tr);
void (*start)(struct trace_array *tr);
void (*stop)(struct trace_array *tr);
+ int (*update_thresh)(struct trace_array *tr);
void (*open)(struct trace_iterator *iter);
void (*pipe_open)(struct trace_iterator *iter);
void (*close)(struct trace_iterator *iter);
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