ftrace: Add :mod: caching infrastructure to trace_array

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This is the start of the infrastructure work to allow for tracing module
functions before it is loaded.

Currently the following command:

  # echo :mod:some-mod > set_ftrace_filter

will enable tracing of all functions within the module "some-mod" if it is
loaded. What we want, is if the module is not loaded, that line will be
saved. When the module is loaded, then the "some-mod" will have that line
executed on it, so that the functions within it starts being traced.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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This commit is contained in:

Steven Rostedt (VMware) 2017-06-23 15:26:26 -04:00

parent feaf1283d1

commit 673feb9d76

2 changed files with 148 additions and 6 deletions

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142

kernel/trace/ftrace.c

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12

kernel/trace/trace.h

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