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ClockEviction

featherdb_storage

Struct ClockEviction 

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

Clock eviction policy (second-chance algorithm)

Simple and efficient. Each page has a reference bit that is set on access. The clock hand sweeps through pages, evicting the first page with reference bit = 0, and clearing reference bits as it goes.

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impl ClockEviction

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pub fn new() -> Self

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impl Default for ClockEviction

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl EvictionPolicy for ClockEviction

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fn on_access(&mut self, page_id: PageId)

Called when a page is accessed (cache hit)
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fn on_load(&mut self, page_id: PageId)

Called when a new page is loaded into the buffer pool
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fn select_victim(&mut self) -> Option<PageId>

Select a victim page for eviction Returns None if no page can be evicted
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fn remove(&mut self, page_id: PageId)

Remove a page from tracking (called when page is evicted or freed)
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fn name(&self) -> &'static str

Get the name of this eviction policy

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where Self: LowerHex,

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where Self: UpperHex,

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