tracing: Add hook to function tracing for other subsystems to use

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Currently Function traces can be only exported to the ring buffer. This
adds a trace_export concept which can process traces and export
them to a registered destination as an addition to the current
one that outputs to Ftrace - i.e. ring buffer.

In this way, if we want function traces to be sent to other destinations
rather than only to the ring buffer, we just need to register a new
trace_export and implement its own .write() function for writing traces to
storage.

With this patch, only function tracing (trace type is TRACE_FN)
is supported.

Link: http://lkml.kernel.org/r/1479715043-6534-2-git-send-email-zhang.chunyan@linaro.org

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Chunyan Zhang 2016-11-21 15:57:18 +08:00 • committed by Steven Rostedt

parent 153aae5f99

commit 478409dd68

2 changed files with 156 additions and 1 deletions

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28

include/linux/trace.h

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129

kernel/trace/trace.c

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