[$] Allowing small allocations to fail

As Michal Hocko noted at the beginning of his session at the 2015 Linux Storage, Filesystem, and Memory Management Summit, the news that thememory-management code will normally retry small allocations indefinitelyrather than returning a failure status came as a surprise to manydevelopers. In this session, the assembled group attempted to come up withways to safely change this behavior. Click below (subscribers only) forthe full report from LSFMM 2015.