RE: [EXT] Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting

[Alison Wang]

Hi, Kurt,

> On Wed Jul 29 2020, Alison Wang wrote:
> > In the current arm64 defconfig, CONFIG_IRQ_TIME_ACCOUNTING is enabled
> > as default. According to my tests on NXP's LayerScape and i.MX
> > platforms, the system hangs when running the command "stress-ng
> > --hrtimers 1" with CONFIG_IRQ_TIME_ACCOUNTING enabled. Disabling this
> > option, the issue disappears. CONFIG_IRQ_TIME_ACCOUNTING causes
> > serious performance impact when running hrtimer stress test at the same
> time.
> 
> I think instead of disabling the option for all arm64 devices, it might be better
> to analyze the root-cause why the hrtimer test hangs when this option is
> enabled.
> 
> +Cc hrtimer maintainers: Thomas and Anna-Maria
> 
[Alison] Yes, I agree. I hope others can give me some clues for the root cause.


Best Regards,
Alison Wang