Re: [PATCH v4 0/2] cpufreq: intel_pstate: Implement passive mode with HWP enabled
From: Rafael J. Wysocki
Date: Mon Aug 03 2020 - 13:23:31 EST
On Saturday, August 1, 2020 6:39:30 PM CEST Srinivas Pandruvada wrote:
> Content-Type: text/plain; charset="UTF-8"
> Content-Transfer-Encoding: 7bit
> On Tue, 2020-07-28 at 17:09 +0200, Rafael J. Wysocki wrote:
> > Hi All,
> > On Monday, July 27, 2020 5:13:40 PM CEST Rafael J. Wysocki wrote:
> > > On Thursday, July 16, 2020 7:37:04 PM CEST Rafael J. Wysocki wrote:
> > > > This really is a v2 of this patch:
> > > >
> > > > https://patchwork.kernel.org/patch/11663271/
> > > >
> > > > with an extra preceding cleanup patch to avoid making unrelated
> > > > changes in the
> > > > [2/2].
> > >
> I applied this series along with
> [PATCH] cpufreq: intel_pstate: Fix EPP setting via sysfs in active mode
> on 5.8 latest master (On top of raw epp patchset).
> When intel_pstate=passive from kernel command line then it is fine, no
> crash. But switch dynamically, crashed:
> Attached crash.txt. I may need to try your linux-pm tree.
Please try the v5 on top of my linux-next branch:
FWIW, I cannot reproduce the crash with it.
> Then after some playing I reached a state when I monitor MSR 0x774:
> while true; do rdmsr 0x774; sleep 1; done
> Don't have a recipe to reproduce this.
Well, maybe it locked up due to the deadlock in the v4 of the patch.
Please see if you get this with the v5 above applied.