linux-kernel - [PATCH v2 3/3] trace-cmd: Making stat to report when the stack tracer is ON

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Date:   Thu, 21 Dec 2017 17:25:20 +0200
From:   "Vladislav Valtchev (VMware)" <vladislav.valtchev@...il.com>
To:     rostedt@...dmis.org
Cc:     y.karadz@...il.com, linux-trace-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Vladislav Valtchev (VMware)" <vladislav.valtchev@...il.com>
Subject: [PATCH v2 3/3] trace-cmd: Making stat to report when the stack tracer is ON

trace-cmd stat is a handy way for users to see what tracing is currently going
on, but currently it does not say anything about the stack tracing. This patch
makes the command to show a message when the stack tracer is ON.

Signed-off-by: Vladislav Valtchev (VMware) <vladislav.valtchev@...il.com>
---
 trace-cmd.h   | 2 ++
 trace-stack.c | 6 ++++++
 trace-stat.c  | 8 ++++++++
 3 files changed, 16 insertions(+)

diff --git a/trace-cmd.h b/trace-cmd.h
index 6fd34d7..9704b2e 100644
--- a/trace-cmd.h
+++ b/trace-cmd.h
@@ -358,6 +358,8 @@ void tracecmd_free_hooks(struct hook_list *hooks);
 /* --- Hack! --- */
 int tracecmd_blk_hack(struct tracecmd_input *handle);
 
+/* --- Stack tracer functions --- */
+int tracecmd_stack_tracer_status(int *status);
 
 /* --- Debugging --- */
 struct kbuffer *tracecmd_record_kbuf(struct tracecmd_input *handle,
diff --git a/trace-stack.c b/trace-stack.c
index d55d994..0028ecc 100644
--- a/trace-stack.c
+++ b/trace-stack.c
@@ -107,6 +107,12 @@ static int read_proc(int *status)
 	return 1; /* full success */
 }
 
+/* Public wrapper of read_proc() */
+int tracecmd_stack_tracer_status(int *status)
+{
+	return read_proc(status);
+}
+
 /* NOTE: this implementation only accepts new_status in the range [0..9]. */
 static void change_stack_tracer_status(int new_status)
 {
diff --git a/trace-stat.c b/trace-stat.c
index fd16354..61dd41f 100644
--- a/trace-stat.c
+++ b/trace-stat.c
@@ -894,6 +894,7 @@ void trace_stat (int argc, char **argv)
 	struct buffer_instance *instance = &top_instance;
 	int topt = 0;
 	int c;
+	int stack_tracer_status;
 
 	for (;;) {
 		c = getopt(argc-1, argv+1, "tB:");
@@ -928,5 +929,12 @@ void trace_stat (int argc, char **argv)
 		stat_instance(instance);
 	}
 
+	if (tracecmd_stack_tracer_status(&stack_tracer_status) >= 0) {
+		if (stack_tracer_status > 0)
+			printf("Stack tracing is enabled\n\n");
+	} else {
+		printf("The status of the stack tracer is indeterminate\n\n");
+	}
+
 	exit(0);
 }
-- 
2.14.1