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Enhance the thread stack to output detailed information about paired calls and returns. The enhanced processing consumes sample information via thread_stack__process() and outputs information about paired calls / returns via a call-back. While the call-back makes it possible for the facility to be used by arbitrary tools, a subsequent patch will provide the information to Python scripting via the db-export interface. An important part of the call/return information is the call path which provides a structure that defines a context sensitive call graph. Note that there are now two ways to use the thread stack. For simply providing a call stack (like you would get from the perf record -g option) the interface consists of thread_stack__event() and thread_stack__sample(). Whereas the enhanced interface consists of call_return_processor__new() and thread_stack__process(). Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1414678188-14946-5-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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