/usr/share/perf_3.16-core/scripts/perl/bin/rw-by-pid-report is in linux-tools-3.16 3.16.56-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/bash
# description: system-wide r/w activity
perf script $@ -s "$PERF_EXEC_PATH"/scripts/perl/rw-by-pid.pl
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