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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