ftrace
GNU GPL version 2[1] | |
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| Website | www |
ftrace (Function Tracer) is a
function calls performed while the kernel is running, ftrace's tracing capabilities cover a much broader range of kernel's internal operations.[2][3]
Details
With its various tracer plugins, ftrace can be targeted at different static tracepoints, such as
: 3–11, 14, 18An ftrace-enabled Linux kernel is built by enabling the CONFIG_FUNCTION_TRACER
userspace utilities to operate.[2][3][6] However, there are additional userspace utilities that provide more advanced features for data recording, analysis and visualization; examples of such utilities are trace-cmd and KernelShark.[2][5]: 31–47 [7][8]
Internally, ftrace relies on the
jumps to the tracing trampolines, depending on the tracing types and options configured at runtime.[9][10]
ftrace is developed primarily by Steven Rostedt, and it was merged into the
Linux kernel mainline in kernel version 2.6.27, which was released on October 9, 2008.[11]
See also
- DTrace – a tracing framework for troubleshooting kernel and application problems, originally developed for Solaris
- ktrace – a BSD Unix and Mac OS X utility that traces kernel–program interactions
- ltrace – a Linux debugging utility, displays the calls a userland application makes to shared libraries
- strace – a debugging utility for Linux and some other Unix-like systems, monitors system calls used by a program and all received signals
- SystemTap – a scripting language and utility used for instrumenting Linux systems
References
- ^ "Linux kernel source: kernel/COPYING file". kernel.org. March 13, 1994. Retrieved June 11, 2016.
- ^ a b c d Jake Edge (March 13, 2009). "A look at ftrace". LWN.net. Retrieved July 23, 2014.
- ^ a b Steven Rostedt (June 16, 2014). "Linux kernel documentation: Documentation/trace/ftrace.txt". kernel.org. Retrieved July 23, 2014.
- ^ "Red Hat Enterprise MRG 2 documentation, Section 3.8. Using the ftrace utility for tracing latencies". Red Hat. May 23, 2014. Retrieved July 24, 2014.
- ^ a b Steven Rostedt (October 18, 2010). "Ftrace: Linux Kernel Tracing" (PDF). linuxfoundation.org. Archived from the original (PDF) on March 8, 2013. Retrieved July 23, 2014.
- ^ "Red Hat Enterprise Linux 6 documentation, Section 6.5. ftrace". Red Hat. March 14, 2014. Retrieved July 23, 2014.
- ^ Steven Rostedt (October 20, 2010). "trace-cmd: A front-end for Ftrace". LWN.net. Retrieved January 19, 2015.
- ^ Steven Rostedt (February 2, 2011). "Using KernelShark to analyze the real-time scheduler". LWN.net. Retrieved June 11, 2016.
- ^ Steven Rostedt (January 5, 2015). "Ftrace Kernel Hooks: More than just tracing" (PDF). linuxplumbersconf.org. pp. 6–12, 24, 34, 56–58. Retrieved June 11, 2016.
- ^ Tim Bird (November 1, 2012). "Measuring Function Duration with Ftrace" (PDF). elinux.org. pp. 5–6, 12–14. Retrieved June 11, 2016.
- ^ "Linux kernel 2.6.27, Section 1.7. ftrace, sysprof support". kernelnewbies.org. October 9, 2008. Retrieved July 23, 2014.
External links
- Debugging the kernel using Ftrace – part 1 and part 2, LWN.net, December 2009, by Steven Rostedt
- Secrets of the Ftrace function tracer, LWN.net, January 20, 2010, by Steven Rostedt
- Ftrace: The hidden light switch, LWN.net, August 13, 2014, by Brendan Gregg
- The source of the e1000e corruption bug, LWN.net, October 21, 2008, by Jonathan Corbet
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