trace - show (real-time) process behavior trace [ -d file ] [ -v ] [ -w ] [ pid ... ] Trace displays the behavior of processes running on the machine. In its window it shows a time line for each traced process. Running processes appear as colored blocks, with arrows marking important events in real-time processes (see proc (3)). Black up arrows mark process releases, black down arrows mark process deadlines, green down arrows mark times when a process yielded the processor before its deadline, red down arrows mark times when the process overran its allotted time.

Trace reads /proc/trace to retrieve trace events from the kernel scheduler. Trace events are binary data structures generated by the kernel scheduler. It is assumed that the reader of /proc/trace and the kernel providing it have the same byte order.

The options are:

-d specify an alternate trace event file

-v print events as they are read from the trace event file

-w run in a new window rather than using the current one

Trace recognizes these keystroke commands while it is running:

+ zoom in by a factor of two

- zoom out by a factor of two

p pause or resume

q quit

proc (3) .TF /sys/include/trace.h

/proc/trace trace event file

/sys/include/trace.h trace event data structures

/sys/src/cmd/trace.c