MapInfoCache

starnix_core::mm

Struct MapInfoCache 

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pub struct MapInfoCache { /* private fields */ }
Expand description

A singleton cache that can be used to share pinned pages across all map info queries. These queries often generate lock contention in Zircon on Starnix’s shared address space when the buffer pages are faulted in. This type holds a long-running allocation in pinned memory to get reduced Zircon VmAspace lock contention in exchange for some extra memory usage and potential lock contention for /proc/pid/status and related files. Luckily it seems that in practice files like /proc/pid/status are not regularly accessed concurrently.

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impl MapInfoCache

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pub fn get_or_init(current_task: &CurrentTask) -> Result<Arc<Self>, Errno>

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pub fn with_map_infos<R>( &self, vmar: &Vmar, op: impl FnOnce(Result<&[MapInfo], Status>) -> R, ) -> R

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