perf hists: Add more helpers for hist entry stat
Add and use he_stat__add_{period,stat} for calculating hist entry's stat. It will be used for accumulated stats later as well. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Arun Sharma <asharma@fb.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1349354994-17853-10-git-send-email-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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