Ceph

Okay, this is definitely something we need to look into more. I tried running with tcmalloc and the standard malloc, and ran
"./rados -p data bench 3600 write -t 20 -b 10485760" (1 hour run, 10MB writes, 20 in-flight)
The standard malloc resulted in the OSD using 3.1GB resident and 3.6GB virtual memory at the end of the hour (peaking at 3.3GB and 3.7GB).
tcmalloc resulted in the OSD using 703.7MB resident and 1.0GB virtual at the end of the hour (that was the peak, but it did clean up at itself several times over the run).

Going to implement this as a compile-time option (based on available libraries) once I've audited the mds and osd for memory leaks so we can see if ptmalloc holds up better once those are toned down.

I guess Sage is going to handle the packaging once the kernel rbd split is accomplished.

merged by a5e582df85354d57b178697b7ad13a75078edb1e