Re: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones

[Peter Zijlstra]

On Tue, Jun 30, 2015 at 04:46:33PM -0700, josh@xxxxxxxxxxxxxxxx wrote:
> Consider it a fairly weak concern against.  Increasing performance seems
> like a good thing in general; I just don't relish the future "feels less
> responsive" bug reports that take a long time to track down and turn out
> to be "this completely unrelated driver was loaded and started using
> expedited grace periods".

random drivers, or for that matter, new-code of any sort. Should _NOT_
be using expedited grace periods.

They're a horrid hack only suitable for unfixable ABI.

> Then again, perhaps the more relevant concern would be why drivers use
> expedited grace periods in the first place.

Right.
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