Re: CONFIG_ISOLATION=y (was: [PATCH 0/6] support "dataplane" mode for nohz_full)

From: Peter Zijlstra
Date: Tue May 12 2015 - 07:48:32 EST

On Tue, May 12, 2015 at 11:10:32AM +0200, Ingo Molnar wrote:
> So I'd vote for Frederic's CONFIG_ISOLATION=y, mostly because this is
> a high level kernel feature, so it won't conflict with isolation
> concepts in lower level subsystems such as IOMMU isolation - and other
> higher level features like scheduler isolation are basically another
> partial implementation we want to merge with all this...

But why do we need a CONFIG flag for something that has no content?

That is, I do not see anything much; except the 'I want to stay in
userspace and kill me otherwise' flag, and I'm not sure that warrants a
CONFIG flag like this.

Other than that, its all a combination of NOHZ_FULL and cpusets/isolcpus
and whatnot.
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