> The objection comes down to this: it's an extremely large, invasive,
> and probably performance-losing patch, which apparently will be of use
> to only a rather small set of people. It's not unreasonable to discuss
> just how large that set might be while we debate whether to accept the
> patch.
Significant loss of performance for people who are not using the
feature seems like it ought to be considered a non-starter. "Not
using MAC" needs to be a fast-path.
...Robert