Re: [PATCH 0/8] use jump labels to streamline common APIC configuration

[Avi Kivity <avi@redhat.com>]

On 08/14/2012 05:58 PM, Jan Kiszka wrote:
>>>
>>> And regarding how common they are: Do standard OSes trigger any
>>> jump-label optimized switch during at least their boot-up? I thought so.
>>> In that case, if you co-locate RT and standard OSes on a shared host,
>>> you would have a conflict.
>>>
>> Yes, during boot up it happens. But it is rate limited to happen not
>> more than once per second. But I genuinely curious does RT guest have
>> any RT guaranties from QEMU/kvm combination today (with of without
>> jump-labels)?
> 
> Yes, when avoiding userspace exits. If you have a customized RTOS guest
> or are lucky with some existing one, that works pretty well for periodic
> processing in the 1 ms range.

I'd have expected better.

For more formal support, we need some ioctl() to pre-populate mappings,
or perhaps extend mmu notifiers to report mlock un munlock operations
and take them as a hint to premap.

-- 
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