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Optionally produce stats on syscall latency
Time spent in system time is not useful where a syscall depends on some non-CPU resource, eg. typically open() or stat() to a network drive. This patch adds a new flag (-w) to produce a summary of the time difference between beginning and end of the system call (ie. latency) This functionality has been useful to profile slow processes that are not CPU-bound. Signed-off-by: Mark Hills <email@example.com>
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