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

[Kevin Hilman]

Hi Paul,

"Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> 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.

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/