Messages in this thread | | | From | Julien Grall <> | Date | Thu, 18 Jul 2013 18:20:52 +0100 | Subject | Re: [Xen-devel] [PATCH] xen/arm: disable cpuidle when linux is running as dom0 |
| |
On 17 July 2013 14:28, Stefano Stabellini <stefano.stabellini@eu.citrix.com> wrote: > On Mon, 15 Jul 2013, Konrad Rzeszutek Wilk wrote: >> On Mon, Jul 15, 2013 at 03:21:41PM +0100, Julien Grall wrote: >> > When linux is running as dom0, Xen doesn't show the physical cpu but a >> > virtual CPU. >> > On some ARM SOC (for instance the exynos 5250), linux registers callbacks >> > for cpuidle. When these callbacks are called, they will modify >> > directly the physical cpu not the virtual one. >> It can impact the whole board >> > instead of dom0. > > Certainly this is something that should be fixed at the hypervisor level > too. However I agree that Linux should try to avoid doing that when > running on Xen. > > > >> Should you also call disable_cpufreq() ? > > Sounds like a good idea. > Julien, could you add that to this patch?
I have checked with both the Arndale and Versatile Express without any issue. I will resend this patch with disable_cpufreq().
-- Julien Grall
| |