retsnoop: handle idle threads properly #71
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Idle threads all have PID 0, one idle thread per each CPU. This screws up retsnoop's logic around using PID as a unique session ID. So for idle threads, use -(1 + CPU ID) as a session (session ID 0 will be reserved as invalid). Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
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Idle threads all have PID 0, one idle thread per each CPU. This screws up retsnoop's logic around using PID as a unique session ID. So for idle threads, use -(1 + CPU ID) as a session (session ID 0 will be reserved as invalid).