From: Daniel Bristot de Oliveira <bristot@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Tao Zhou <tao.zhou@linux.dev>,
Daniel Bristot de Oliveira <bristot@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Tom Zanussi <zanussi@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Juri Lelli <juri.lelli@redhat.com>,
Clark Williams <williams@redhat.com>,
John Kacur <jkacur@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-rt-users@vger.kernel.org,
linux-trace-devel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH V6 04/20] trace/osnoise: Use start/stop_per_cpu_kthreads() on osnoise_cpus_write()
Date: Wed, 27 Oct 2021 00:06:15 +0200 [thread overview]
Message-ID: <2b4ea45b1802844cffd98b6a208b22bc4664c795.1635284863.git.bristot@kernel.org> (raw)
In-Reply-To: <cover.1635284863.git.bristot@kernel.org>
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.
No functional change.
Cc: Steven Rostedt <rostedt@goodmis.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>
---
kernel/trace/trace_osnoise.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 4381a06af916..7453b96c548b 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1677,9 +1677,6 @@ osnoise_cpus_read(struct file *filp, char __user *ubuf, size_t count,
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
@@ -1724,7 +1721,7 @@ 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);
/*
@@ -1738,7 +1735,7 @@ 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);
--
2.31.1
next prev parent reply other threads:[~2021-10-26 22:08 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-26 22:06 [PATCH V6 00/20] RTLA: An interface for osnoise/timerlat tracers Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 01/20] trace/osnoise: Do not follow tracing_cpumask Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 02/20] trace/osnoise: Improve comments about barrier need for NMI callbacks Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 03/20] trace/osnoise: Split workload start from the tracer start Daniel Bristot de Oliveira
2021-10-26 22:06 ` Daniel Bristot de Oliveira [this message]
2021-10-26 22:06 ` [PATCH V6 05/20] trace/osnoise: Support a list of trace_array *tr Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 06/20] trace/osnoise: Allow multiple instances of the same tracer Daniel Bristot de Oliveira
2021-10-28 2:50 ` Steven Rostedt
2021-10-26 22:06 ` [PATCH V6 07/20] rtla: Real-Time Linux Analysis tool Daniel Bristot de Oliveira
2021-10-28 2:54 ` Steven Rostedt
2021-10-26 22:06 ` [PATCH V6 08/20] rtla: Helper functions for rtla Daniel Bristot de Oliveira
2021-10-27 14:02 ` Tao Zhou
2021-10-27 14:21 ` Steven Rostedt
2021-10-27 16:24 ` Daniel Bristot de Oliveira
2021-10-27 16:37 ` Steven Rostedt
2021-10-27 16:55 ` Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 09/20] rtla: Add osnoise tool Daniel Bristot de Oliveira
2021-10-27 16:30 ` Tao Zhou
2021-10-29 16:03 ` Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 10/20] rtla/osnoise: Add osnoise top mode Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 11/20] rtla/osnoise: Add the hist mode Daniel Bristot de Oliveira
2021-10-27 18:11 ` Tao Zhou
2021-10-27 18:29 ` Steven Rostedt
2021-10-27 22:32 ` Tao Zhou
2021-10-29 16:04 ` Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 12/20] rtla: Add timerlat tool and timelart top mode Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 13/20] rtla/timerlat: Add timerlat hist mode Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 14/20] rtla: Add Documentation Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 15/20] rtla: Add rtla osnoise man page Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 16/20] rtla: Add rtla osnoise top documentation Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 17/20] rtla: Add rtla osnoise hist documentation Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 18/20] rtla: Add rtla timerlat documentation Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 19/20] rtla: Add rtla timerlat top documentation Daniel Bristot de Oliveira
2021-10-26 22:06 ` [PATCH V6 20/20] rtla: Add rtla timerlat hist documentation Daniel Bristot de Oliveira
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