Add MemoryReservation::{split_off, take, new_empty}#7184
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alamb merged 2 commits intoapache:mainfrom Aug 3, 2023
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alamb
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Aug 2, 2023
| if consumer.can_spill { | ||
| self.state.lock().num_spill -= 1; | ||
| let mut state = self.state.lock(); | ||
| state.num_spill = state.num_spill.checked_sub(1).unwrap(); |
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this will now panic rather than silently underflow
| r1.grow(2000); | ||
| assert_eq!(pool.reserved(), 2000); | ||
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| let mut r2 = MemoryConsumer::new("s1") |
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I renamed the names to match the local variable names as the indirection of a different number was very confusing to me when debugging this test.
| /// the underlying pool. | ||
| #[derive(Debug)] | ||
| pub struct MemoryReservation { | ||
| struct SharedRegistration { |
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This structure allows different MemoryReservations to share the same consumer
| /// # Panics | ||
| /// | ||
| /// Panics if `capacity` exceeds [`Self::size`] | ||
| pub fn split(&mut self, capacity: usize) -> MemoryReservation { |
| impl Drop for MemoryReservation { | ||
| fn drop(&mut self) { | ||
| self.free(); | ||
| self.policy.unregister(&self.consumer); |
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This is moved to SharedReservation::drop
tustvold
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Aug 2, 2023
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Which issue does this PR close?
Part of #5885
Rationale for this change
This PR contains new MemoryReservation APIs used in #7130. They were originally written by @tustvold and I polished them up, fixed a bug, and added tests
I broke it into its own PR for ease in reviewing. You can see the usecase in #7130.
What changes are included in this PR?
Are these changes tested?
Yes
Are there any user-facing changes?