Part of this patch was already committed, and the overall patch has had
its fair share of review for this commitfest, so I'm marking this as
"Returned with feedback". The benchmark results for the bgreclaimer
showed a fairly small improvement, so it doesn't seem like anyone's
going to commit the rest of the patch soon, not without more discussion
and testing anyway. Let's not hold up the commitfest for that.
- Heikki
