[PATCH 10/12 v2] tracing: Do not disable tracing when reading the trace file

From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Peter Wu <peter@lekensteyn.nl>, Jonathan Corbet <corbet@lwn.net>,
	Tom Zanussi <zanussi@kernel.org>,
	Shuah Khan <shuahkhan@gmail.com>, bpf <bpf@vger.kernel.org>
Subject: [PATCH 10/12 v2] tracing: Do not disable tracing when reading the trace file
Date: Thu, 19 Mar 2020 19:22:29 -0400	[thread overview]
Message-ID: <20200319232732.999288179@goodmis.org> (raw)
In-Reply-To: 20200319232219.446480829@goodmis.org

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

When opening the "trace" file, it is no longer necessary to disable tracing.

Link: http://lkml.kernel.org/r/20200317213416.903351225@goodmis.org

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 47889123be7f..b7052ffb0211 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4273,10 +4273,6 @@ __tracing_open(struct inode *inode, struct file *file, bool snapshot)
 	if (trace_clocks[tr->clock_id].in_ns)
 		iter->iter_flags |= TRACE_FILE_TIME_IN_NS;
 
-	/* stop the trace while dumping if we are not opening "snapshot" */
-	if (!iter->snapshot)
-		tracing_stop_tr(tr);
-
 	if (iter->cpu_file == RING_BUFFER_ALL_CPUS) {
 		for_each_tracing_cpu(cpu) {
 			iter->buffer_iter[cpu] =
@@ -4371,10 +4367,6 @@ static int tracing_release(struct inode *inode, struct file *file)
 	if (iter->trace && iter->trace->close)
 		iter->trace->close(iter);
 
-	if (!iter->snapshot)
-		/* reenable tracing if it was previously enabled */
-		tracing_start_tr(tr);
-
 	__trace_array_put(tr);
 
 	mutex_unlock(&trace_types_lock);
-- 
2.25.1


