Macro kernel_launch_span 

macro_rules! kernel_launch_span {
    ($name:expr, $grid:expr, $block:expr) => { ... };
}

Emit a tracing span for a kernel launch.

Arguments

• $name — kernel function name (string literal or &str).
• $grid — grid dimensions (anything that implements Debug).
• $block — block dimensions (anything that implements Debug).

Behaviour

• With the tracing feature: returns an tracing::Span entered at INFO level. Assign the result to a variable; the span closes when the variable is dropped.
• Without the tracing feature: expands to ().