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Tag: john birrell
John Birrell - DTrace for FreeBSD
Source: BSDCan - The Technical BSD Conference
Added: 21 May 2008
Tags: bsdcan, bsdcan2008, slides, dtrace, freebsd, john birrell
PDF file (148 Kb, 49 pages)
DTrace for FreeBSD
What on earth is that system doing?!
DTrace is a comprehensive dynamic tracing facility
originally developed for Solaris that can be used
by administrators and developers on live production
systems to examine the behavior of both user programs
and of the operating system itself. DTrace enables
users to explore their system to understand how it
works, track down performance problems across many
layers of software, or locate the cause of aberrant
behavior. DTrace lets users create their own custom
programs to dynamically instrument the system and
provide immediate, concise answers to arbitrary
questions you can formulate using the DTrace D
This talk discusses the port of the DTrace facility
to FreeBSD and demonstrates examples on a live
- Introduction to the D language - probes, predicates and actions.
- dtrace(8) and libdtrace - the userland side of the DTrace story.
- The DTrace kernel module, it's ioctl interface to userland and the provider infrastructure in the kernel.
- DTrace kernel hooks and the problem of code licensed under Sun's CDDL.
- What does a DTrace probe actually do?
- DTrace safety and how it is implemented.
- Build system changes to add CTF (Compact C Type Format) data to objects, shared libraries and executables.
- The DTrace test suite.
- A brief list of things to do to port the DTrace facility to other BSD-derived operating systems.