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[review] mention that runtime may scale with # of mountpoints

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Co-authored-by: Josh Triplett <josh@joshtriplett.org>
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the8472 2022-07-22 22:18:07 +02:00 committed by GitHub
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library/std/src/thread/mod.rs
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@ -1575,6 +1575,11 @@ fn _assert_sync_and_send() {
/// queried, e.g. due to sandboxing.
/// - It may undercount the amount of parallelism if the current thread's affinity mask
/// does not reflect the process' cpuset, e.g. due to pinned threads.
/// - If the process is in a cgroup v1 cpu controller, this may need to
/// scan mountpoints to find the corresponding cgroup v1 controller,
/// which may take time on systems with large numbers of mountpoints.
/// (This does not apply to cgroup v2, or to processes not in a
/// cgroup.)
///
/// On all targets:
/// - It may overcount the amount of parallelism available when running in a VM