Re: [PATCH] rcu: update: make RCU_EXPEDITE_BOOT default

[Sebastian Andrzej Siewior]

On 2016-11-07 12:19:39 [-0500], Steven Rostedt wrote:
> I agree, but if this creates a boot time regression in large machines,
> it may not be warranted.
> 
> I know Linus usually doesn't like options with default y, but this may
> be one of those exceptions. Perhaps we should make it on by default and
> say in the config "if you have a machine with 100s or 1000s of CPUs,
> you may want to disable this".

The default could change if we know where the limit is. I have access to
a box with approx 140 CPUs so I could check there if it is already bad.
But everything above that / in the 1000 range is a different story.

> -- Steve

Sebastian