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- What: /sys/kernel/debug/tracing
- Date: May 2008
- KernelVersion: 2.6.27
- Contact: linux-trace-kernel@vger.kernel.org
- Description:
- The ftrace was first added to the kernel, its interface was placed
- into the debugfs file system under the "tracing" directory. Access
- to the files were in /sys/kernel/debug/tracing. As systems wanted
- access to the tracing interface without having to enable debugfs, a
- new interface was created called "tracefs". This was a stand alone
- file system and was usually mounted in /sys/kernel/tracing.
- To allow older tooling to continue to operate, when mounting
- debugfs, the tracefs file system would automatically get mounted in
- the "tracing" directory of debugfs. The tracefs interface was added
- in January 2015 in the v4.1 kernel.
- All tooling should now be using tracefs directly and the "tracing"
- directory in debugfs should be removed by January 2030.
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