perf diff: Make hist_entry_diff fields union
The period_ratio_delta, period_ratio and wdiff are never by used at the same time. Instead, Just one of them is accessed according to a comparison method. So make it union to reduce memory footprint. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1429416255-12070-3-git-send-email-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Showing
Please register or sign in to comment