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Rollup merge of #90198 - the8472:available-parallelism-runtime, r=joshtriplett

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Add caveat about changing parallelism and function call overhead

As discussed in https://github.com/rust-lang/rust/pull/89670#discussion_r728179584

r? ``@joshtriplett``
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Matthias Krüger 2021-10-23 14:58:43 +02:00 committed by GitHub
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library/std/src/thread/mod.rs
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@ -1449,6 +1449,10 @@ fn _assert_sync_and_send() {
/// global state in order to more accurately query the amount of available
/// parallelism.
///
/// Resource limits can be changed during the runtime of a program, therefore the value is
/// not cached and instead recomputed every time this function is called. It should not be
/// called from hot code.
///
/// The value returned by this function should be considered a simplified
/// approximation of the actual amount of parallelism available at any given
/// time. To get a more detailed or precise overview of the amount of