From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: 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, fweisbec@gmail.com,
patches@linaro.org
Subject: [PATCH RFC idle] Make arm, sh, and x86 stop using RCU when idle
Date: Wed, 1 Feb 2012 16:42:53 -0800 [thread overview]
Message-ID: <20120202004253.GA10946@linux.vnet.ibm.com> (raw)
Hello!
RCU's shiny new diagnostics (thank you, Frederic!) for using RCU when idle
located a few problems in arm, sh, and x86. This patch series contains
alleged fixes for these problems. And they are real problems -- if RCU
believes that the CPU is idle, it is ignoring it. Which means that the
idle CPU can say "rcu_read_lock()" all it like, but there will be no
useful effect.
I was tempted to break these up, but doing so is bad for bisectability.
Thanx, Paul
------------------------------------------------------------------------
arch/arm/kernel/process.c | 2 --
arch/arm/mach-at91/cpuidle.c | 3 +++
arch/arm/mach-davinci/cpuidle.c | 3 +++
arch/arm/mach-exynos/common.c | 2 ++
arch/arm/mach-highbank/pm.c | 12 ++++++++++++
arch/arm/mach-imx/mm-imx3.c | 3 +++
arch/arm/mach-imx/pm-imx27.c | 4 ++++
arch/arm/mach-imx/pm-imx6q.c | 4 ++++
arch/arm/mach-kirkwood/cpuidle.c | 3 +++
arch/arm/mach-mx5/mm.c | 3 +++
arch/arm/mach-mx5/pm-imx5.c | 3 +++
arch/arm/mach-mxs/pm.c | 4 ++++
arch/arm/mach-omap1/pm.c | 4 ++++
arch/arm/mach-omap2/pm24xx.c | 2 ++
arch/arm/mach-omap2/pm34xx.c | 2 ++
arch/arm/mach-omap2/pm44xx.c | 3 +++
arch/arm/mach-pnx4008/pm.c | 2 ++
arch/arm/mach-prima2/pm.c | 4 ++++
arch/arm/mach-s5p64x0/common.c | 2 ++
arch/arm/mach-s5pc100/common.c | 2 ++
arch/arm/mach-s5pv210/common.c | 2 ++
arch/arm/mach-shmobile/cpuidle.c | 3 +++
arch/arm/mach-shmobile/pm-sh7372.c | 8 ++++++++
arch/sh/kernel/idle.c | 11 ++++++++---
arch/x86/kernel/process.c | 13 ++++++++++++-
arch/x86/kernel/process_32.c | 2 --
arch/x86/kernel/process_64.c | 4 ----
drivers/idle/intel_idle.c | 2 ++
28 files changed, 100 insertions(+), 12 deletions(-)
next reply other threads:[~2012-02-02 0:43 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-02 0:42 Paul E. McKenney [this message]
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 ` [PATCH RFC idle 1/3] x86: " Frederic Weisbecker
2012-02-02 4:55 ` 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
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=20120202004253.GA10946@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=Valdis.Kletnieks@vt.edu \
--cc=akpm@linux-foundation.org \
--cc=darren@dvhart.com \
--cc=dhowells@redhat.com \
--cc=dipankar@in.ibm.com \
--cc=eric.dumazet@gmail.com \
--cc=fweisbec@gmail.com \
--cc=josh@joshtriplett.org \
--cc=laijs@cn.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@polymtl.ca \
--cc=mingo@elte.hu \
--cc=niv@us.ibm.com \
--cc=patches@linaro.org \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.