[staleness] sub-malloc staleness

_From [derek.br...@gmail.com](https://code.google.com/u/117968039472581148324/) on December 10, 2010 19:52:18_

PR 553726

in my PR 551136 staleness prototype, the date of a malloc is the date of
its newest 8-byte piece: not supporting sub-malloc staleness. if app has
giant mallocs w/ only one field touched in each and solution is to split
into pieces then can't tell w/ newest and would want oldest: and also
offest of oldest so know which field? filing as a potential future
feature.

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=223_