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ftrace: document function and function graph implementation

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While implementing function tracer and function tracer graph support,
I found the exact arch implementation details to be a bit lacking
(and my x86 foo ain't great).  So after pounding out support for
the Blackfin arch, start documenting the requirements/details.

Signed-off-by: Mike Frysinger <[email protected]>
LKML-Reference: <[email protected]>
Acked-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
This commit is contained in:
Mike Frysinger 2009-09-14 20:10:15 -04:00 • committed by Steven Rostedt
commit 555f386c98
3 changed files with 252 additions and 3 deletions
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16
kernel/trace/Kconfig
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@ -11,12 +11,18 @@ config NOP_TRACER
config HAVE_FTRACE_NMI_ENTER
bool
help
See Documentation/trace/ftrace-implementation.txt
config HAVE_FUNCTION_TRACER
bool
help
See Documentation/trace/ftrace-implementation.txt
config HAVE_FUNCTION_GRAPH_TRACER
bool
help
See Documentation/trace/ftrace-implementation.txt
config HAVE_FUNCTION_GRAPH_FP_TEST
bool
@ -28,21 +34,25 @@ config HAVE_FUNCTION_GRAPH_FP_TEST
config HAVE_FUNCTION_TRACE_MCOUNT_TEST
bool
help
This gets selected when the arch tests the function_trace_stop
variable at the mcount call site. Otherwise, this variable
is tested by the called function.
See Documentation/trace/ftrace-implementation.txt
config HAVE_DYNAMIC_FTRACE
bool
help
See Documentation/trace/ftrace-implementation.txt
config HAVE_FTRACE_MCOUNT_RECORD
bool
help
See Documentation/trace/ftrace-implementation.txt
config HAVE_HW_BRANCH_TRACER
bool
config HAVE_SYSCALL_TRACEPOINTS
bool
help
See Documentation/trace/ftrace-implementation.txt
config TRACER_MAX_TRACE
bool