Re: [Xen-devel] [PATCH] tools/misc/xenpm: fix getting info when some CPUs are offline

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 31.10.18 at 11:53, <marmarek@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, Oct 31, 2018 at 03:33:58AM -0600, Jan Beulich wrote:
>> I'm also afraid there are further quirks here, with various constructs
>> along the lines of (as bodies of aforementioned for())
>> 
>>         if ( show_cxstat_by_cpuid(xc_handle, i) == -ENODEV )
>>             break;
>> 
>> which I suspect would terminate processing early when hitting a true
>> gap (i.e. not one resulting from a parked CPU). 
> 
> How that would happen? Hotplug?

xen-hptool on AMD might trigger this, afaict.

> Also I've tried to look at error codes to distinguish offline cpu and
> avoid printing that error, but looks EINVAL is used for a lot of cases.

Yeah, the common problem with EINVAL.

Jan



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