Re: [PATCH 3/6] dataplane nohz: run softirqs synchronously on user entry

From: Peter Zijlstra
Date: Tue May 12 2015 - 05:32:23 EST

On Mon, May 11, 2015 at 04:13:16PM -0400, Chris Metcalf wrote:
> The thing you want to avoid is having two processes both
> runnable at once

Right, because as soon as nr_running > 1 we kill the entire nohz_full
thing. RT or not for ksoftirqd doesn't matter.

Then again, like interrupts, you basically want to avoid softirqs in
this mode.

So I think the right solution is to figure out why the softirqs get
raised and cure that.
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