From: Daniel Bristot de Oliveira <bristot@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: 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 V9 4/9] tracing/osnoise: Use start/stop_per_cpu_kthreads() on osnoise_cpus_write()
Date: Sun, 31 Oct 2021 19:04:59 +0100 [thread overview]
Message-ID: <ee633e82867c5b88851aa6040522a799c0034486.1635702894.git.bristot@kernel.org> (raw)
In-Reply-To: <cover.1635702894.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.
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 5279a4990493..cacc11b7d5ae 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1678,9 +1678,6 @@ 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
@@ -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);
--
2.31.1
next prev parent reply other threads:[~2021-10-31 18:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-31 18:04 [PATCH V9 0/9] osnoise: Support multiple instances (for RTLA) Daniel Bristot de Oliveira
2021-10-31 18:04 ` [PATCH V9 1/9] tracing/osnoise: Do not follow tracing_cpumask Daniel Bristot de Oliveira
2021-10-31 18:04 ` [PATCH V9 2/9] tracing/osnoise: Improve comments about barrier need for NMI callbacks Daniel Bristot de Oliveira
2021-10-31 18:04 ` [PATCH V9 3/9] tracing/osnoise: Split workload start from the tracer start Daniel Bristot de Oliveira
2021-10-31 18:04 ` Daniel Bristot de Oliveira [this message]
2021-10-31 18:05 ` [PATCH V9 5/9] tracing/osnoise: Support a list of trace_array *tr Daniel Bristot de Oliveira
2021-10-31 18:05 ` [PATCH V9 6/9] tracing/osnoise: Remove TIMERLAT ifdefs from inside functions Daniel Bristot de Oliveira
2021-10-31 18:05 ` [PATCH V9 7/9] tracing/osnoise: Allow multiple instances of the same tracer Daniel Bristot de Oliveira
2021-10-31 18:05 ` [PATCH V9 8/9] tracing/osnoise: Remove STACKTRACE ifdefs from inside functions Daniel Bristot de Oliveira
2021-10-31 18:05 ` [PATCH V9 9/9] tracing/osnoise: Remove PREEMPT_RT " Daniel Bristot de Oliveira
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ee633e82867c5b88851aa6040522a799c0034486.1635702894.git.bristot@kernel.org \
--to=bristot@kernel.org \
--cc=bigeasy@linutronix.de \
--cc=jkacur@redhat.com \
--cc=juri.lelli@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rt-users@vger.kernel.org \
--cc=linux-trace-devel@vger.kernel.org \
--cc=mhiramat@kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
--cc=williams@redhat.com \
--cc=zanussi@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).