linux-kernel - Re: [PATCH RFC 0/41] RCU commits for 3.4

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Message-ID: <20120202235852.GO2518@linux.vnet.ibm.com>
Date:	Thu, 2 Feb 2012 15:58:52 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Kevin Hilman <khilman@...com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	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 0/41] RCU commits for 3.4

On Thu, Feb 02, 2012 at 02:47:14PM -0800, Kevin Hilman wrote:
> Hi Paul,
> 
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> writes:
> 
> > This patchset makes RCU more aggressive about entering dyntick-idle mode
> > in order to improve energy efficiency, 
> 
> I gave this series a spin on an ARM/SMP platform (OMAP4) and the boot
> hung (tail end of boot log below.)  I then realized that had isolcpus=1
> on the cmdline from a previous experiment.  Removing isolcpus from the
> cmdline got me back to a working boot.
> 
> IIRC, some want to remove isolcpus, so I'm not sure if it's expected to
> work with your series, but thought you'd want to know.

Not expected behavior, thank you for testing!

Could you please share your .config?

							Thanx, Paul

> Kevin
> 
> 
> 
> [    1.105834] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> [    1.353942] omap_uart.0: ttyO0 at MMIO 0x4806a000 (irq = 104) is a OMAP UART0
> [    1.462707] omap_uart.1: ttyO1 at MMIO 0x4806c000 (irq = 105) is a OMAP UART1
> [    1.548614] omap_uart.2: ttyO2 at MMIO 0x48020000 (irq = 106) is a OMAP UART2
> [    1.556304] console [ttyO2] enabled, bootconsole disabled
> [    1.556304] console [ttyO2] enabled, bootconsole disabled
> [   61.587493] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=7682 jiffies)
> [   61.596649] INFO: Stall ended before state dump start
> 

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