echo with escape sequences isn't portable. Use printf instead.

Two fixes for replication: Slave performs the AOF rewrite at the right point. Non blocking connect also uses readable handler as with old Linux kernels like 2.6.18 on connection refused the writable even is not fired (kernel bug).

INFO now contains the time (in usecs) needed to fork() in order to persist. The info is available in the stats section of INFO.

Warn the user that will try to enable VM that VM sucks. But still allows him to enable VM with a special option.

jemalloc support backported in 2.4 using part of the Pieter Noordhuis and Didier Spezia original implementations