From: Steven Rostedt <rostedt@goodmis.org>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: "Joel Fernandes (Google)" <joel@joelfernandes.org>,
linux-kernel@vger.kernel.org, Davidlohr Bueso <dave@stgolabs.net>,
Ingo Molnar <mingo@redhat.com>,
Josh Triplett <josh@joshtriplett.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Marco Elver <elver@google.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
rcu@vger.kernel.org, "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Subject: Re: [PATCH 3/7] rcu/trace: Add name of the source for gp_seq
Date: Thu, 18 Jun 2020 20:01:38 -0400 [thread overview]
Message-ID: <20200618200138.500b20cb@oasis.local.home> (raw)
In-Reply-To: <20200618221901.GZ2723@paulmck-ThinkPad-P72>
On Thu, 18 Jun 2020 15:19:01 -0700
"Paul E. McKenney" <paulmck@kernel.org> wrote:
> For future reference, the TPS() around strings is not optional. Without
> it, trace messages from crash dumps are garbled, if I remember correctly.
When you pass in a string like this, only the pointer to the string is
saved in the ring buffer. User space tools have no idea what those
pointers are. The TPS() around strings maps those pointers to the
string and shows them in the /sys/kernel/tracing/printk_formats file,
such that perf and trace-cmd know how to make sense of those strings.
-- Steve
next prev parent reply other threads:[~2020-06-19 0:01 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-18 20:29 [PATCH 1/7] rcu/segcblist: Prevent useless GP start if no CBs to accelerate Joel Fernandes (Google)
2020-06-18 20:29 ` [PATCH 2/7] rcu/trace: Add tracing for how segcb list changes Joel Fernandes (Google)
2020-06-18 22:16 ` Paul E. McKenney
2020-06-18 23:52 ` Joel Fernandes
2020-06-18 20:29 ` [PATCH 3/7] rcu/trace: Add name of the source for gp_seq Joel Fernandes (Google)
2020-06-18 22:19 ` Paul E. McKenney
2020-06-18 23:51 ` Joel Fernandes
2020-06-19 0:12 ` Paul E. McKenney
2020-06-19 0:56 ` Joel Fernandes
2020-06-19 1:08 ` Joel Fernandes
2020-06-19 0:01 ` Steven Rostedt [this message]
2020-06-19 1:01 ` Joel Fernandes
2020-06-18 20:29 ` [PATCH 4/7] rcu/trace: Print negative GP numbers correctly Joel Fernandes (Google)
2020-06-18 22:30 ` Paul E. McKenney
2020-06-18 20:29 ` [PATCH 5/7] rcu/trace: Use rsp's gp_seq in acceleration's rcu_grace_period tracepoint Joel Fernandes (Google)
2020-06-18 22:27 ` Paul E. McKenney
2020-06-18 23:54 ` Joel Fernandes
2020-06-18 20:29 ` [PATCH 6/7] rcutorture: Add support to get the number of wakeups of main GP kthread Joel Fernandes (Google)
2020-06-18 22:40 ` Paul E. McKenney
2020-06-19 0:01 ` Joel Fernandes
2020-06-19 0:12 ` Paul E. McKenney
2020-06-19 1:00 ` Joel Fernandes
2020-06-19 3:23 ` Paul E. McKenney
2020-06-18 20:29 ` [PATCH 7/7] rcutorture: Add number of GP information to reports Joel Fernandes (Google)
2020-06-18 23:27 ` Paul E. McKenney
2020-06-18 22:11 ` [PATCH 1/7] rcu/segcblist: Prevent useless GP start if no CBs to accelerate Paul E. McKenney
2020-06-18 23:09 ` Paul E. McKenney
2020-06-19 0:04 ` Joel Fernandes
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