[PATCH v3 2/2] trace-cmd: Add --no-filter option to not filter recording processes

[Slavomir Kaslev <kaslevs@vmware.com>]

Add --no-filter option which doesn't install filters for the trace-cmd recording
processes pids.

Signed-off-by: Slavomir Kaslev <kaslevs@vmware.com>
Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 tracecmd/trace-record.c | 14 +++++++++++---
 tracecmd/trace-usage.c  |  1 +
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index dae0396..05a313b 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -86,6 +86,7 @@ static int do_ptrace;
 
 static int filter_task;
 static int filter_pid = -1;
+static bool no_filter = false;
 
 static int local_cpu_count;
 
@@ -1063,6 +1064,9 @@ static void update_task_filter(void)
 	struct buffer_instance *instance;
 	int pid = getpid();
 
+	if (no_filter)
+		return;
+
 	if (filter_task)
 		add_filter_pid(pid, 0);
 
@@ -4377,9 +4381,9 @@ void update_first_instance(struct buffer_instance *instance, int topt)
 }
 
 enum {
-
-	OPT_quiet		= 246,
-	OPT_debug		= 247,
+	OPT_quiet		= 245,
+	OPT_debug		= 246,
+	OPT_no_filter		= 247,
 	OPT_max_graph_depth	= 248,
 	OPT_tsoffset		= 249,
 	OPT_bycomm		= 250,
@@ -4603,6 +4607,7 @@ static void parse_record_options(int argc,
 			{"by-comm", no_argument, NULL, OPT_bycomm},
 			{"ts-offset", required_argument, NULL, OPT_tsoffset},
 			{"max-graph-depth", required_argument, NULL, OPT_max_graph_depth},
+			{"no-filter", no_argument, NULL, OPT_no_filter},
 			{"debug", no_argument, NULL, OPT_debug},
 			{"quiet", no_argument, NULL, OPT_quiet},
 			{"help", no_argument, NULL, '?'},
@@ -4877,6 +4882,9 @@ static void parse_record_options(int argc,
 			if (!ctx->max_graph_depth)
 				die("Could not allocate option");
 			break;
+		case OPT_no_filter:
+			no_filter = true;
+			break;
 		case OPT_debug:
 			debug = 1;
 			break;
diff --git a/tracecmd/trace-usage.c b/tracecmd/trace-usage.c
index 9ea1906..29a7081 100644
--- a/tracecmd/trace-usage.c
+++ b/tracecmd/trace-usage.c
@@ -56,6 +56,7 @@ static struct usage_help usage_help[] = {
 		"          --func-stack perform a stack trace for function tracer\n"
 		"             (use with caution)\n"
 		"          --max-graph-depth limit function_graph depth\n"
+		"          --no-filter do not set any event filters\n"
 	},
 	{
 		"start",
-- 
2.19.1