kvm Library

Utilities like ps or vmstat use kvm library to get data from kernel. Traditionally, the library scanned /vmunix binary file for a list of kernel symbols and their addresses in memory. In case of embedded system, the kernel resides in flash memory, and is not present in the filesystem anymore. A solution is to modify the kvm library and kernel, to get symbol addresses from the kernel itself by utilizing sysctl() interface.

Here is a list of all utilities and kernel symbols to be exported via sysctl() call.

Source file	Kernel symbols
lib/libkvm/kvm_file.c	_filehead _nfiles
lib/libkvm/kvm_getloadavg.c	_averunnable _fscale
lib/libkvm/kvm_proc.c	_nprocs _allproc _zombproc
lib/libkvm/kvm_mips.c	Sysmap Sysmapsize
lib/libkvm/bin/ps/nlist.c	_fscale _ccpu _avail_start _avail_end
sbin/dmesg/dmesg.c	_msgbufp
usr.bin/netstat/main.c	_icmpstat _ifnet _igmpstat _ip_mrtproto _ipstat _mbstat _mrtstat _mrttable _rtstat _rt_tables _tcb _tcpstat _udb _udpstat _unixsw _viftable
usr.bin/nfsstat/nfsstat.c	_nfsstats
usr.bin/systat/disks.c	_dk_ndrive _dk_wpms _scsi_dinit
usr.bin/systat/iostat.c	_dk_busy _dk_time _dk_xfer _dk_wds _dk_seek _cp_time
usr.bin/systat/main.c	_hz _stathz
usr.bin/systat/mbufs.c	_mbstat
usr.bin/systat/netstat.c	_tcb _udb
usr.bin/systat/pigs.c	_cp_time _ccpu _fscale
usr.bin/systat/swap.c	_swapmap _nswapmap _swdevt _nswap _nswdev _dmmax
usr.bin/systat/vmstat.c	_cp_time _cnt _total _dk_busy _dk_time _dk_xfer _dk_wds _dk_seek _nchstats _intrnames _eintrnames _intrcnt _eintrcnt
usr.bin/vmstat/vmstat.c	_cp_time _dk_ndrive _cnt _boottime _dk_xfer _hz _stathz _nchstats _intrnames _eintrnames _intrcnt _eintrcnt _kmemstats _bucket _scsi_dinit
usr.sbin/iostat/iostat.c	_dk_time _dk_xfer _dk_wds _tk_nin _tk_nout _dk_seek _cp_time _dk_wpms _hz _stathz _dk_ndrive _scsi_dinit
usr.sbin/kgmon/kgmon.c	__gmonparam _profhz
usr.sbin/pstat/pstat.c	_swapmap _nswapmap _swdevt _nswap _nswdev _dmmax _mountlist _numvnodes _nfiles _maxfiles _niswap _niswdev _cons _pt_tty _npty _uart_tty _uart_cnt