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 0/3] Fix cpuidle_idle_call() RCU usage
Date: Thu, 2 Feb 2012 17:12:08 -0800 [thread overview]
Message-ID: <20120203011208.GA2004@linux.vnet.ibm.com> (raw)
Hello!
This patch series is a second attempt to fix the idle-loop uses of RCU,
see https://lkml.org/lkml/2012/2/1/741 for v1. Where the first series
attempted to drive rcu_idle_enter() and rcu_idle_exit() further down
into the Linux kernels multitude of idle loops, this patch instead
marks specific idle-loop operations containing RCU read-side critical
sections, as suggested by Nicolas Pitre and Steven Rostedt. The possibility
of code shared between idle and non-idle also requires the ability to nest
rcu_idle_enter() calls. The individual patches are as follows:
1. Allow nesting of rcu_idle_enter() and rcu_idle_exit().
2. Add an RCU_NONIDLE() macro to enclose idle-loop code that
contains RCU read-side critical sections.
3. Use RCU_NONIDLE() to protect cpuidle_idle_call()'s tracepoints.
This patchset has the distinct advantage of avoiding touching any
architecture-specific code. ;-)
Thanx, Paul
------------------------------------------------------------------------
b/drivers/cpuidle/cpuidle.c | 12 ++++++++----
b/include/linux/rcupdate.h | 27 +++++++++++++++++++++++++++
b/kernel/rcu.h | 18 +++++++++++++++++-
b/kernel/rcutiny.c | 16 ++++++++++++----
b/kernel/rcutree.c | 19 +++++++++++++------
kernel/rcutiny.c | 2 ++
kernel/rcutree.c | 2 ++
7 files changed, 81 insertions(+), 15 deletions(-)
next reply other threads:[~2012-02-03 1:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-03 1:12 Paul E. McKenney [this message]
2012-02-03 1:12 ` [PATCH RFC tip/core/rcu 1/3] rcu: Allow nesting of rcu_idle_enter() and rcu_idle_exit() Paul E. McKenney
2012-02-03 1:12 ` [PATCH RFC tip/core/rcu 2/3] rcu: Add RCU_NONIDLE() for idle-loop RCU read-side critical sections Paul E. McKenney
2012-02-03 1:12 ` [PATCH RFC tip/core/rcu 3/3] cpuidle: Inform RCU of " Paul E. McKenney
2012-02-03 11:02 ` Deepthi Dharwar
2012-02-03 2:43 ` [PATCH RFC 0/3] Fix cpuidle_idle_call() RCU usage Josh Triplett
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