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Message-ID: <20110715233203.GM2327@linux.vnet.ibm.com>
Date: Fri, 15 Jul 2011 16:32:03 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
David Miller <davem@...emloft.net>,
Chris Metcalf <cmetcalf@...era.com>,
Guan Xuetao <gxt@...c.pku.edu.cn>,
Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>,
Mike Frysinger <vapier@...too.org>,
Ralf Baechle <ralf@...ux-mips.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Russell King <linux@....linux.org.uk>,
Paul Mackerras <paulus@...ba.org>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 0/3] rcu: Fix some rcu uses in extended quiescent state
On Mon, Jul 11, 2011 at 10:34:29PM +0200, Frederic Weisbecker wrote:
> Hi,
>
> First patch lays the ground to fix rcu uses in dyntick idle mode
> by splitting rcu extended qs state logic from tick nohz one.
>
> The rest fixes the misuses that RCU has detected for me in x86.
These look good to me -- I have queued them and will try testing
them out.
> I'll try to fix those Paul has detected in PowerPc.
Looking forward to that one as well. ;-)
It would be really cool if this approach could serve as RCU's idle-CPU
detection regardless of whether or not CONFIG_NO_HZ was set. For one
thing, this would simplify the RCU code that treats idle tasks as extended
quiescent states. Except during boot time. :-/
Thanx, Paul
> Frederic Weisbecker (3):
> nohz: Split extended quiescent state handling from nohz switch
> x86: Enter rcu extended qs after idle notifier call
> x86: Call idle notifier after irq_enter()
>
> arch/arm/kernel/process.c | 4 +-
> arch/avr32/kernel/process.c | 4 +-
> arch/blackfin/kernel/process.c | 4 +-
> arch/microblaze/kernel/process.c | 4 +-
> arch/mips/kernel/process.c | 4 +-
> arch/powerpc/kernel/idle.c | 4 +-
> arch/powerpc/platforms/iseries/setup.c | 8 +++---
> arch/s390/kernel/process.c | 4 +-
> arch/sh/kernel/idle.c | 2 +-
> arch/sparc/kernel/process_64.c | 4 +-
> arch/tile/kernel/process.c | 4 +-
> arch/um/kernel/process.c | 4 +-
> arch/unicore32/kernel/process.c | 4 +-
> arch/x86/kernel/apic/apic.c | 6 ++--
> arch/x86/kernel/apic/io_apic.c | 2 +-
> arch/x86/kernel/cpu/mcheck/mce.c | 2 +-
> arch/x86/kernel/cpu/mcheck/therm_throt.c | 2 +-
> arch/x86/kernel/cpu/mcheck/threshold.c | 2 +-
> arch/x86/kernel/irq.c | 6 ++--
> arch/x86/kernel/process_32.c | 4 +-
> arch/x86/kernel/process_64.c | 5 ++++
> include/linux/tick.h | 10 +++++--
> kernel/time/tick-sched.c | 36 ++++++++++++++++++++++++++---
> 23 files changed, 83 insertions(+), 46 deletions(-)
>
> --
> 1.7.5.4
>
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