Andi Kleen <[email protected]> writes:
> From: Ingo Molnar <[email protected]>
>
> Default to physical mode on hotplug CPU kernels. Furher simplify and clean up
> the APIC initialization code.
Where is the code that the subject describes?
I have two problems here.
- I don't see anything handling the hotplug case, and forcing us to
physical mode.
- Ingo's other patch asserts that hotplug should be made to handle
logical deliver mode.
With logical deliver mode the experimental evidence is that the
destination cpu is a hint, and you can arrive at a cpu that is not
in your cpu mask. Now I only saw that problem on hyperthreaded cpus
but we didn't have the code enabled long enough to see it in other
cases.
Maybe if I can finish getting irq migration back into process context,
and someone verifies that the cpu disable in the hotplug path actually
disables the cpu/hyperthread instead of sitting in a hlt loop. We
won't have a problem. But broadcast ipis and irqs that don't go where
you tell them to are things we need to be very careful with.
Eric
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
