From: Frederic Weisbecker <fweisbec@gmail.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
eric.dumazet@gmail.com, darren@dvhart.com, patches@linaro.org,
"Paul E. McKenney" <paul.mckenney@linaro.org>,
"H. Peter Anvin" <hpa@zytor.com>, Len Brown <lenb@kernel.org>,
Borislav Petkov <bp@alien8.de>,
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
Stephen Wilson <wilsons@start.ca>,
linux-pm@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH RFC idle 1/3] x86: Avoid invoking RCU when CPU is idle
Date: Thu, 2 Feb 2012 02:54:30 +0100 [thread overview]
Message-ID: <20120202015428.GA8807@somewhere.redhat.com> (raw)
In-Reply-To: <1328143404-11038-1-git-send-email-paulmck@linux.vnet.ibm.com>
On Wed, Feb 01, 2012 at 04:43:22PM -0800, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paul.mckenney@linaro.org>
>
> The idle loop is a quiscent state for RCU, which means that RCU ignores
> CPUs that have told RCU that they are idle via rcu_idle_enter(). There
> are nevertheless quite a few places where idle CPUs use RCU, most commonly
> indirectly via tracing. This patch fixes these problems for x86.
>
> Many of these bugs have been in the kernel for quite some time, but
> Frederic's recent change now gives warnings.
>
> This patch takes the straightforward approach of pushing the
> rcu_idle_enter()/rcu_idle_exit() pair further down into the core
> of the idle loop.
I guess this is about the trace_power_*() things, right?
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Thanks.
next prev parent reply other threads:[~2012-02-02 1:54 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-02 0:42 [PATCH RFC idle] Make arm, sh, and x86 stop using RCU when idle Paul E. McKenney
2012-02-02 0:43 ` [PATCH RFC idle 1/3] x86: Avoid invoking RCU when CPU is idle Paul E. McKenney
2012-02-02 0:43 ` [PATCH RFC idle 2/3] arm: " Paul E. McKenney
2012-02-02 0:43 ` Paul E. McKenney
2012-02-02 2:48 ` Rob Herring
2012-02-02 2:48 ` Rob Herring
2012-02-02 4:40 ` Paul E. McKenney
2012-02-02 4:40 ` Paul E. McKenney
2012-02-02 3:49 ` Nicolas Pitre
2012-02-02 3:49 ` Nicolas Pitre
2012-02-02 4:44 ` Paul E. McKenney
2012-02-02 4:44 ` Paul E. McKenney
2012-02-02 17:13 ` Nicolas Pitre
2012-02-02 17:13 ` Nicolas Pitre
2012-02-02 17:43 ` Paul E. McKenney
2012-02-02 17:43 ` Paul E. McKenney
2012-02-02 18:31 ` Nicolas Pitre
2012-02-02 18:31 ` Nicolas Pitre
2012-02-02 19:07 ` Paul E. McKenney
2012-02-02 19:07 ` Paul E. McKenney
2012-02-02 22:20 ` Kevin Hilman
2012-02-02 22:20 ` Kevin Hilman
2012-02-02 22:49 ` Rob Herring
2012-02-02 22:49 ` Rob Herring
2012-02-02 23:03 ` Steven Rostedt
2012-02-02 23:03 ` Steven Rostedt
2012-02-02 23:27 ` Paul E. McKenney
2012-02-02 23:27 ` Paul E. McKenney
2012-02-02 23:51 ` Paul E. McKenney
2012-02-02 23:51 ` Paul E. McKenney
2012-02-03 2:45 ` Steven Rostedt
2012-02-03 2:45 ` Steven Rostedt
2012-02-03 6:04 ` Paul E. McKenney
2012-02-03 6:04 ` Paul E. McKenney
2012-02-03 18:55 ` Steven Rostedt
2012-02-03 18:55 ` Steven Rostedt
2012-02-03 19:40 ` Paul E. McKenney
2012-02-03 19:40 ` Paul E. McKenney
2012-02-03 20:02 ` Steven Rostedt
2012-02-03 20:02 ` Steven Rostedt
2012-02-03 20:23 ` Paul E. McKenney
2012-02-03 20:23 ` Paul E. McKenney
2012-02-06 21:18 ` [PATCH][RFC] tracing/rcu: Add trace_##name##__rcuidle() static tracepoint for inside rcu_idle_exit() sections Steven Rostedt
2012-02-06 21:18 ` Steven Rostedt
2012-02-06 23:38 ` Paul E. McKenney
2012-02-06 23:38 ` Paul E. McKenney
2012-02-07 12:32 ` Steven Rostedt
2012-02-07 12:32 ` Steven Rostedt
2012-02-07 14:11 ` Paul E. McKenney
2012-02-07 14:11 ` Paul E. McKenney
2012-02-08 13:57 ` Frederic Weisbecker
2012-02-08 13:57 ` Frederic Weisbecker
2012-02-07 14:40 ` Josh Triplett
2012-02-07 14:40 ` Josh Triplett
[not found] ` <20120206220502.GA21340@leaf>
2012-02-07 0:36 ` Steven Rostedt
2012-02-07 0:36 ` Steven Rostedt
2012-02-17 13:47 ` [tip:perf/core] " tip-bot for Steven Rostedt
[not found] ` <20120203025350.GF13456@leaf>
2012-02-03 6:06 ` [PATCH RFC idle 2/3] arm: Avoid invoking RCU when CPU is idle Paul E. McKenney
2012-02-03 6:06 ` Paul E. McKenney
2012-02-02 23:39 ` Rob Herring
2012-02-02 23:39 ` Rob Herring
2012-02-03 18:41 ` Kevin Hilman
2012-02-03 18:41 ` Kevin Hilman
2012-02-03 19:26 ` Paul E. McKenney
2012-02-03 19:26 ` Paul E. McKenney
2012-02-03 19:36 ` Steven Rostedt
2012-02-03 19:36 ` Steven Rostedt
2012-02-04 14:21 ` Paul E. McKenney
2012-02-04 14:21 ` Paul E. McKenney
2012-02-06 19:32 ` Steven Rostedt
2012-02-06 19:32 ` Steven Rostedt
2012-02-02 23:03 ` Paul E. McKenney
2012-02-02 23:03 ` Paul E. McKenney
2012-02-03 19:12 ` Kevin Hilman
2012-02-03 19:12 ` Kevin Hilman
2012-02-03 19:26 ` Paul E. McKenney
2012-02-03 19:26 ` Paul E. McKenney
2012-02-02 0:43 ` [PATCH RFC idle 3/3] sh: " Paul E. McKenney
2012-02-02 0:43 ` Paul E. McKenney
2012-02-02 1:54 ` Frederic Weisbecker [this message]
2012-02-02 4:55 ` [PATCH RFC idle 1/3] x86: " Paul E. McKenney
2012-02-02 0:48 ` [PATCH RFC idle] Make arm, sh, and x86 stop using RCU when idle Josh Triplett
2012-02-02 1:14 ` Paul E. McKenney
2012-02-02 2:29 ` Paul Mundt
2012-02-02 4:58 ` Paul E. McKenney
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