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