linux-kernel - Re: [PATCH RFC 0/3] Fix cpuidle_idle

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Date:	Thu, 2 Feb 2012 18:43:46 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org
Subject: Re: [PATCH RFC 0/3] Fix cpuidle_idle_call() RCU usage

On Thu, Feb 02, 2012 at 05:12:08PM -0800, Paul E. McKenney wrote:
> 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(-)

Looks good to me.  Much cleaner.

Reviewed-by: Josh Triplett <josh@...htriplett.org>
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