arm64 sched_clock cpu accounting

[Mario Smarduch]

Also with tick accounting enabled, and periodic timer HZ set to 1000 no irq time
is reported. That's with running a ping flood - 1200 int/s, not sure why
wouldn't any irq time be reported? The other two modes report irq time as expected.

On 11/18/2015 11:46 AM, Mario Smarduch wrote:
> Hello,
>   I noticed sched clock accounting can be enabled when arch-timer is
> initialized. But arm64 doesn't appear to have 'HAVE_IRQ_TIME_ACCOUNTING'
> selected (as of mainline 4.4-rc1) and IRQ_TIME_ACCOUNTING can't be selected.
> After adding it to arch/arm64/Kconfig, option appears to work fine. Depending on
> need all accounting options are fine, but irq time accounting appears to be most
> preferable.
> 
> Any thoughts? Is it fine to enable it?
> 
> Thanks,
>   Mario
> 
> 
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