ftrace: Access ret_stack->subtime only in the function profiler

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The subtime is used only for function profiler with function graph
tracer enabled.  Move the definition of subtime under
CONFIG_FUNCTION_PROFILER to reduce the memory usage.  Also move the
initialization of subtime into the graph entry callback.

Link: http://lkml.kernel.org/r/20160831025529.24018-1-namhyung@kernel.org

Cc: Ingo Molnar <mingo@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

...

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Namhyung Kim 2016-08-31 11:55:29 +09:00 • committed by Steven Rostedt

parent 613dccdf68

commit 8861dd303c

4 changed files with 13 additions and 6 deletions

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10

Documentation/trace/ftrace.txt

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2

include/linux/ftrace.h

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6

kernel/trace/ftrace.c

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1

kernel/trace/trace_functions_graph.c

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