New Background process in 11g.
I do not have more details on this until Oracle posts the complete Manual. Just giving you all heads up on this.
DIA0 - Hang and dead lock resolution
DIAG - Diagnostic dumps
DBRM - Resource manager process
EMNC - event monitor co-ordinator
VKTM - Virtual time keeper
FBDA - Flashback archive
GMON - Disk membership in ASM
ACMS - for RAC
KATE - I/O to an ASM when disk offline
GTX0j - Xa Global transaction in a RAC
PSP0 - Spawn a process
RMSn - RAC management process
RMSN - manage slave process in RAC
Wnnn - Space management coordination process