tracing/osnoise: Use start/stop_per_cpu_kthreads() on osnoise_cpus_write()

When writing a new CPU mask via osnoise/cpus, if the tracer is running,
the workload is restarted to follow the new cpumask. The restart is
currently done using osnoise_workload_start/stop(), which disables the
workload *and* the instrumentation. However, disabling the
instrumentation is not necessary.

Calling start/stop_per_cpu_kthreads() is enough to apply the new
osnoise/cpus config.

Link: https://lkml.kernel.org/r/ee633e82867c5b88851aa6040522a799c0034486.1635702894.git.bristot@kernel.org
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: linux-rt-users@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 5279a49..cacc11b 100644 (file)
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1678,9 +1678,6 @@ out_unlock:
        return count;
 }
 
-static int osnoise_workload_start(void);
-static void osnoise_workload_stop(void);
-
 /*
  * osnoise_cpus_write - Write function for "cpus" entry
  * @filp: The active open file structure
@@ -1725,7 +1722,7 @@ osnoise_cpus_write(struct file *filp, const char __user *ubuf, size_t count,
        mutex_lock(&trace_types_lock);
        running = osnoise_busy;
        if (running)
-               osnoise_workload_stop();
+               stop_per_cpu_kthreads();
 
        mutex_lock(&interface_lock);
        /*
@@ -1739,7 +1736,7 @@ osnoise_cpus_write(struct file *filp, const char __user *ubuf, size_t count,
        mutex_unlock(&interface_lock);
 
        if (running)
-               osnoise_workload_start();
+               start_per_cpu_kthreads();
        mutex_unlock(&trace_types_lock);
 
        free_cpumask_var(osnoise_cpumask_new);