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It has been determined that the map is for overwrite mode (evlist->overwrite_mmap) or non-overwrite mode (evlist->mmap) when calling perf_evlist__alloc_mmap(). Store the information in struct perf_mmap, which will be used later to simplify the perf_mmap__read*() interfaces. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Suggested-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Andi Kleen <ak@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1520350567-80082-1-git-send-email-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>