linux-kernel - Re: [RFC PATCH 00/11] rcu: Userspace RCU extended quiescent state v2

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Message-ID: <20120716221556.GH2403@linux.vnet.ibm.com>
Date:	Mon, 16 Jul 2012 15:15:56 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 00/11] rcu: Userspace RCU extended quiescent state v2

On Wed, Jul 11, 2012 at 08:26:29PM +0200, Frederic Weisbecker wrote:
> Hi,
> 
> There are significant changes this time. I reverted back to using
> a TIF flag to hook on syscalls slow path and put the hooks on
> high level exception handlers instead of low level ones.
> 
> It makes the code more portable between x86-32 and x86-64, it
> makes the hooks clearer and easier to review and the overhead
> is lowered in the off-case. This can be even better if we use
> jump labels later.

Thank you, Frederic, I have queued these:

git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/idle

I had to rework patch 4 a bit to take into account that I dropped the
rcu_switch_from() patch, please check it to make sure that I didn't
rework it out of existence.

							Thanx, Paul

> Thanks.
> 
> git://github.com/fweisbec/linux-dynticks.git
> 	rcu/user-2
> 
> Frederic Weisbecker (11):
>   rcu: Settle config for userspace extended quiescent state
>   rcu: Allow rcu_user_enter()/exit() to nest
>   rcu: Ignore userspace extended quiescent state by default
>   rcu: Switch task's syscall hooks on context switch
>   x86: Syscall hooks for userspace RCU extended QS
>   x86: Exception hooks for userspace RCU extended QS
>   rcu: Exit RCU extended QS on kernel preemption after irq/exception
>   rcu: Exit RCU extended QS on user preemption
>   x86: Use the new schedule_user API on userspace preemption
>   x86: Exit RCU extended QS on notify resume
>   rcu: Userspace RCU extended QS selftest
> 
>  arch/Kconfig                       |   10 ++++++
>  arch/um/drivers/mconsole_kern.c    |    2 +-
>  arch/x86/Kconfig                   |    1 +
>  arch/x86/include/asm/rcu.h         |   20 +++++++++++
>  arch/x86/include/asm/thread_info.h |   10 ++++--
>  arch/x86/kernel/entry_64.S         |    8 ++--
>  arch/x86/kernel/ptrace.c           |    5 +++
>  arch/x86/kernel/signal.c           |    4 ++
>  arch/x86/kernel/traps.c            |   30 ++++++++++++----
>  arch/x86/mm/fault.c                |   13 ++++++-
>  include/linux/rcupdate.h           |   10 ++++++
>  include/linux/sched.h              |   20 ++++++-----
>  init/Kconfig                       |   18 ++++++++++
>  kernel/rcutree.c                   |   64 +++++++++++++++++++++++++++++++-----
>  kernel/rcutree.h                   |    4 ++
>  kernel/sched/core.c                |   10 +++++-
>  16 files changed, 192 insertions(+), 37 deletions(-)
>  create mode 100644 arch/x86/include/asm/rcu.h
> 
> -- 
> 1.7.5.4
> 

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