modcalls.d - kernel function calls by module. Uses DTrace. modcalls.d modcalls.d is a DTrace OneLiner to a report of the number of kernel function calls by module. This script may be useful to determine whether drivers are "thinking" when troubleshooting driver issues. Docs/oneliners.txt and Docs/Examples/oneliners_examples.txt in the DTraceToolkit contain this as a oneliner that can be cut-n-paste to run. Since this uses DTrace, only the root user or users with the dtrace_kernel privilege can run this command. Any stable - while this script uses the unstable fbt provider, it does so in a stable way.

This samples until Ctrl-C is hit. # modcalls.d

first field This is the module name, or kernel driver name. if a name is unfamiliar to you there may be a man page to explain what it is.

second field This is the number of function calls by this module.

See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output. modcalls.d will sample until Ctrl-C is hit. Brendan Gregg [Sydney, Australia] dtrace(1M)