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. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
