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2021-05-26ripple/driver.pl: a basic syscall tracing driveredef
This program spawns a child in a new cgroup (using systemd-run) under bpftrace and counts syscall invocations for each (syscall, comm) pair. It outputs a TSV of (syscall, comm, count) tuples to STDERR. This makes it easy to assess which system calls a build process uses, segmented by a useful approximation of the invoking programs. Change-Id: I9ab7a34fda82245d3fa22b47840de16d1decf719