'e' - Send a SIGTERM to all processes, except for init.
-'f' - Will call oom_kill to kill a memory hog process.
+'f' - Will call the oom killer to kill a memory hog process, but do not
+ panic if nothing can be killed.
'g' - Used by kgdb (kernel debugger)
'x' - Used by xmon interface on ppc/powerpc platforms.
Show global PMU Registers on sparc64.
+ Dump all TLB entries on MIPS.
'y' - Show global CPU Registers [SPARC-64 specific]