$ ./funcgraph USAGE: funcgraph [-aCDhHPtT] [-m maxdepth] [-p PID] [-L TID] [-d secs] funcstring -a # all info (same as -HPt) -C # measure on-CPU time only -d seconds # trace duration, and use buffers -D # do not show function duration -h # this usage message -H # include column headers -m maxdepth # max stack depth to show -p PID # trace when this pid is on-CPU -L TID # trace when this thread is on-CPU -P # show process names & PIDs -t # show timestamps -T # comment function tails eg, funcgraph do_nanosleep # trace do_nanosleep() and children funcgraph -m 3 do_sys_open # trace do_sys_open() to 3 levels only funcgraph -a do_sys_open # include timestamps and process name funcgraph -p 198 do_sys_open # trace vfs_read() for PID 198 only funcgraph -d 1 do_sys_open >out # trace 1 sec, then write to file
