KTAP: A New Dynamic Tracing Tool For Linux
Written by Michael Larabel in Linux Kernel on 31 December 2012 at 09:53 AM EST. 1 Comment
KTAP is an experimental project that's a new dynamic tracing tool for Linux. KTAP has several different design principles from SystemTap, one of the current most common dynamic instrumentation and tracing tools for Linux. This new project might satisfy some of those developers that have been wanting Sun/Oracle's DTrace to come to Linux.

Realizing SystemTap wasn't fulfilling all of his dynamic tracing needs on Linux, Jovi Zhang, an embedded Linux developer, wrote KTAP. KTAP uses a scripting language and lets users trace the Linux kernel dynamically. While different, KTAP does have some common points with the current Linux SystemTap and DTrace on Solaris.

Differentiating KTAP from SystemTap is that it dnes't depend upon GCC, doesn't require compiling a kernel module, has greater portability, uses its own "simple" dynamic-typed script language, KTAP cannot crash the Linux kernel, and KTAP is completely open-source under the GPL. Right now the project is just seeking "request for comments" while in an experimental state, but the developer may look at mainlining the code into the Linux kernel in the future. Another benefit of KTAP is that it won't require root privileges in a future update.

KTAP isn't trying to be a clone or port of DTrace from Solaris to Linux but is built from scratch. The custom KTAP script language shares a syntax similar to Lua and is all GPL licensed. KTAPC is the KTAP user-space compiler for compiling the KTAP script into a bytecode chunk file that the KTAP binary then loads and runs.

For more details on KTAP for the Linux kernel, see the KTAP announcement that was made on Sunday to the Linux kernel mailing list. The project is still experimental but is showing early promise.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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