From: "H. Peter Anvin" <hpa@zytor.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Jiri Olsa <jolsa@redhat.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: [RFC][PATCH 17/18 v2] ftrace/cpuidle/x86: Mark functions that are RCU unsafe
Date: Tue, 03 Sep 2013 17:16:17 -0700 [thread overview]
Message-ID: <52267BD1.1070608@zytor.com> (raw)
In-Reply-To: <20130831051703.241036187@goodmis.org>
On 08/30/2013 10:11 PM, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
>
> Some callbacks of the function tracer use rcu_read_lock(). This means that
> there's places that can not be traced because RCU is not tracking the CPU
> for various reasons (like NO_HZ_FULL and coming back from userspace).
>
> Thes functions need to be marked so that callbacks that use RCU do not
> trace them.
>
> Cc: H. Peter Anvin <hpa@zytor.com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: H. Peter Anvin <hpa@zytor.com>
next prev parent reply other threads:[~2013-09-04 0:17 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-31 5:11 [RFC][PATCH 00/18 v2] ftrace/rcu: Handle unsafe RCU functions and ftrace callbacks Steven Rostedt
2013-08-31 5:11 ` [RFC][PATCH 01/18 v2] ftrace: Add hash list to save RCU unsafe functions Steven Rostedt
2013-08-31 19:28 ` Paul E. McKenney
2013-09-03 21:15 ` Steven Rostedt
2013-09-03 22:18 ` Paul E. McKenney
2013-09-03 23:57 ` Steven Rostedt
2013-09-04 0:18 ` Steven Rostedt
2013-09-04 1:11 ` [RFC][PATCH 19/18] ftrace: Print a message when the rcu checker is disabled Steven Rostedt
2013-09-04 1:25 ` Paul E. McKenney
2013-09-04 1:24 ` [RFC][PATCH 01/18 v2] ftrace: Add hash list to save RCU unsafe functions Paul E. McKenney
2013-09-04 1:51 ` Steven Rostedt
2013-09-04 1:56 ` Steven Rostedt
2013-09-04 2:01 ` Steven Rostedt
2013-09-04 2:03 ` Steven Rostedt
2013-09-04 4:18 ` Paul E. McKenney
2013-09-04 11:50 ` Steven Rostedt
2013-09-04 4:12 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 02/18 v2] ftrace: Do not set ftrace records for unsafe RCU when not allowed Steven Rostedt
2013-08-31 19:29 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 03/18 v2] ftrace: Set ftrace internal function tracing RCU safe Steven Rostedt
2013-08-31 19:30 ` Paul E. McKenney
2013-08-31 19:44 ` Paul E. McKenney
2013-09-03 13:22 ` Steven Rostedt
2013-09-03 13:54 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 04/18 v2] ftrace: Add test for ops against unsafe RCU functions in callback Steven Rostedt
2013-08-31 19:45 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 05/18 v2] ftrace: Do not display non safe RCU functions in available_filter_functions Steven Rostedt
2013-08-31 19:46 ` Paul E. McKenney
2013-08-31 20:35 ` Steven Rostedt
2013-08-31 20:54 ` Paul E. McKenney
2013-09-03 13:26 ` Steven Rostedt
2013-09-03 13:54 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 06/18 v2] ftrace: Add rcu_unsafe_filter_functions file Steven Rostedt
2013-08-31 19:46 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 07/18 v2] ftrace: Add selftest to check if RCU unsafe functions are filtered properly Steven Rostedt
2013-08-31 19:47 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 08/18 v2] ftrace/rcu: Do not trace debug_lockdep_rcu_enabled() Steven Rostedt
2013-08-31 19:21 ` Paul E. McKenney
2013-08-31 20:31 ` Steven Rostedt
2013-08-31 5:11 ` [RFC][PATCH 09/18 v2] ftrace: Fix a slight race in modifying what function callback gets traced Steven Rostedt
2013-08-31 5:11 ` [RFC][PATCH 10/18 v2] ftrace: Create a RCU unsafe checker Steven Rostedt
2013-08-31 19:49 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 11/18 v2] ftrace: Adde infrastructure to stop RCU unsafe checker from checking Steven Rostedt
2013-08-31 19:52 ` Paul E. McKenney
2013-08-31 20:40 ` Steven Rostedt
2013-09-03 13:43 ` Steven Rostedt
2013-09-03 15:22 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 12/18 v2] ftrace: Disable RCU unsafe checker when function graph is enabled Steven Rostedt
2013-08-31 19:55 ` Paul E. McKenney
2013-08-31 20:42 ` Steven Rostedt
2013-08-31 20:58 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 13/18 v2] ftrace: Disable the RCU unsafe checker when irqsoff " Steven Rostedt
2013-08-31 19:58 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 14/18 v2] ftrace/lockdep: Have the RCU lockdep splat show what function triggered Steven Rostedt
2013-08-31 19:59 ` Paul E. McKenney
2013-09-05 19:18 ` Peter Zijlstra
2013-09-05 19:52 ` Steven Rostedt
2013-09-06 12:57 ` Ingo Molnar
2013-09-06 13:16 ` Steven Rostedt
2013-09-05 19:35 ` Peter Zijlstra
2013-09-05 20:27 ` Steven Rostedt
2013-08-31 5:11 ` [RFC][PATCH 15/18 v2] ftrace/rcu: Mark functions that are RCU unsafe Steven Rostedt
2013-08-31 20:00 ` Paul E. McKenney
2013-08-31 20:43 ` Steven Rostedt
2013-08-31 20:54 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 16/18 v2] rcu/irq/x86: " Steven Rostedt
2013-08-31 20:01 ` Paul E. McKenney
2013-08-31 5:11 ` [RFC][PATCH 17/18 v2] ftrace/cpuidle/x86: " Steven Rostedt
2013-08-31 11:07 ` Wysocki, Rafael J
2013-08-31 20:02 ` Paul E. McKenney
2013-09-04 0:16 ` H. Peter Anvin [this message]
2013-08-31 5:11 ` [RFC][PATCH 18/18 v2] ftrace/sched: " Steven Rostedt
2013-08-31 20:01 ` Paul E. McKenney
2013-08-31 15:50 ` [RFC][PATCH 00/18 v2] ftrace/rcu: Handle unsafe RCU functions and ftrace callbacks Steven Rostedt
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