From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Don Zickus <dzickus@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 1/2] nohz: Disable LOCKUP_DETECTOR when NO_HZ_FULL is enabled
Date: Thu, 16 May 2013 10:10:27 +0200 [thread overview]
Message-ID: <20130516081027.GD19669@dyad.programming.kicks-ass.net> (raw)
In-Reply-To: <1368637441.6828.70.camel@gandalf.local.home>
On Wed, May 15, 2013 at 01:04:01PM -0400, Steven Rostedt wrote:
> On Wed, 2013-05-15 at 18:59 +0200, Peter Zijlstra wrote:
>
> > At which point we could run the watchdog without perf_event_task_tick().
>
> At which point we can drop the disable LOCKUP_DETECTOR when NO_HZ_FULL
> is enabled ;-)
>
Can we? The thing I'm worried about is RCU (of course!). ISTR we rely on RCU
working in NMI context. AFAIR for RCU to work, we need to come out of out magic
NO_HZ state since that would've put RCU into EQS.
Frederic, PaulMck?
next prev parent reply other threads:[~2013-05-16 8:12 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-14 16:02 [GIT PULL] Nohz fixes Frederic Weisbecker
2013-05-14 16:02 ` [PATCH 1/2] nohz: Disable LOCKUP_DETECTOR when NO_HZ_FULL is enabled Frederic Weisbecker
2013-05-15 8:37 ` Peter Zijlstra
2013-05-15 15:06 ` Don Zickus
2013-05-15 15:27 ` Steven Rostedt
2013-05-15 16:26 ` Don Zickus
2013-05-15 16:59 ` Peter Zijlstra
2013-05-15 17:04 ` Steven Rostedt
2013-05-16 8:10 ` Peter Zijlstra [this message]
2013-05-16 11:38 ` Frederic Weisbecker
2013-05-16 17:57 ` Peter Zijlstra
2013-05-16 15:07 ` Paul E. McKenney
2013-05-16 17:56 ` Peter Zijlstra
2013-05-16 18:32 ` Steven Rostedt
2013-05-16 23:14 ` Frederic Weisbecker
2013-05-19 16:18 ` Paul E. McKenney
2013-05-16 20:06 ` Paul E. McKenney
2013-05-15 17:11 ` Peter Zijlstra
2013-05-15 17:50 ` Don Zickus
2013-05-15 16:55 ` Peter Zijlstra
2013-05-15 15:59 ` Frederic Weisbecker
2013-05-14 16:02 ` [PATCH 2/2] nohz: Warn if the machine can not perform nohz_full Frederic Weisbecker
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