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Add 'overwrite' attribute to evsel to mark whether this event is overwritable. The following commits will support syntax like: # perf record -e cycles/overwrite/ ... An overwritable evsel requires kernel support for the perf_event_attr.write_backward ring buffer feature. Add it to perf_missing_feature. Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1463762315-155689-2-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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