NAME

       threadsnoop.bt - Trace thread creation via pthread_create(). Uses bpftrace/eBPF.

SYNOPSIS

       threadsnoop.bt

DESCRIPTION

       threadsnoop  traces calls to pthread_create(), showing this path of thread creation. This can be used for
       workload characterization and discovery, and is a companion to execsnoop.bt(8) which traces execve(2).

       This works by tracing the pthread_create() from libpthread.so.0.  The  path  to  this  library  may  need
       adjusting in the tool source to match your system.

       Since this uses BPF, only the root user can use this tool.

REQUIREMENTS

       CONFIG_BPF and bpftrace.

EXAMPLES

       Trace calls pthread_create():
              # threadsnoop.bt

FIELDS

       TIME(ms)
              Elapsed time since the tool began tracing (in milliseconds).

       PID    The process ID.

       COMM   The process (thread) name.

       FUNC   The  name  of  the  start  routine,  if  the symbol is available, else a hex address for the start
              routine address.

OVERHEAD

       Thread creation is expected to be low (<< 1000/s), so the  overhead  of  this  tool  is  expected  to  be
       negligible.

SOURCE

       This tool originated from the book "BPF Performance Tools", published by Addison Wesley (2019):

              http://www.brendangregg.com/bpf-performance-tools-book.html

       See the book for more documentation on this tool.

       This version is in the bpftrace repository:

              https://github.com/iovisor/bpftrace

       Also  look  in  the  bpftrace  distribution  for a companion _examples.txt file containing example usage,
       output, and commentary for this tool.

OS

       Linux

STABILITY

       Unstable - in development.

AUTHOR

       Brendan Gregg

SEE ALSO

       execsnoop.bt(8)