On Wed, Apr 08, 2015 at 02:12:34PM -0400, Chris Metcalf wrote:

> >But you're doing the reverse! You're setting nohz_full for isolcpus, not
> >limiting the nohz_full mask to isolcpus.
> 
> Ah, I see.  Yes, that's right.  

No its not, you should correct me when I'm wrong ;-)

So the problem is that:

+       tick_nohz_full_set_cpus(cpu_isolated_map);

reads like you're doing:

  nohz_full_map |= isolcpus_map

But in actual fact you're doing:

  isolcpus_map |= nohz_full_map

So that function is retarded, but the logic is fine.

So NAK on both patches for the reason that they're utterly confusing as
to wtf they actually do.
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