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Sebastian Kunert
3386377b0f
# Runtime side for PoV Reclaim ## Implementation Overview - Hostfunction to fetch the storage proof size has been added to the PVF. It uses the size tracking recorder that was introduced in my previous PR. - Mechanisms to use the reclaim HostFunction have been introduced. - 1. A SignedExtension that checks the node-reported proof size before and after application of an extrinsic. Then it reclaims the difference. - 2. A manual helper to make reclaiming easier when manual interaction is required, for example in `on_idle` or other hooks. - In order to utilize the manual reclaiming, I modified `WeightMeter` to support the reduction of consumed weight, at least for storage proof size. ## How to use To enable the general functionality for a parachain: 1. Add the SignedExtension to your parachain runtime. 2. Provide the HostFunction to the node 3. Enable proof recording during block import ## TODO - [x] PRDoc --------- Co-authored-by: Dmitry Markin <dmitry@markin.tech> Co-authored-by: Davide Galassi <davxy@datawok.net> Co-authored-by: Bastian Köcher <git@kchr.de>
30 lines
1.4 KiB
Plaintext
30 lines
1.4 KiB
Plaintext
# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
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# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
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title: PoV Reclaim Runtime Side
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author: skunert
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topic: runtime
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doc:
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- audience: Runtime Dev
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description: |
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Adds a mechanism to reclaim proof size weight.
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1. Introduces a new `SignedExtension` that reclaims the difference
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between benchmarked proof size weight and actual consumed proof size weight.
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2. Introduces a manual mechanism, `StorageWeightReclaimer`, to reclaim excess storage weight for situations
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that require manual weight management. The most prominent case is the `on_idle` hook.
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3. Adds the `storage_proof_size` host function to the PVF. Parachain nodes should add it to ensure compatibility.
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To enable proof size reclaiming, add the host `storage_proof_size` host function to the parachain node. Add the
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`StorageWeightReclaim` `SignedExtension` to your runtime and enable proof recording during block import.
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crates:
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- name: "cumulus-primitives-storage-weight-reclaim"
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host_functions:
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- name: "storage_proof_size"
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description: |
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This host function is used to pass the current size of the storage proof to the runtime.
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It was introduced before but becomes relevant now.
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Note: This host function is intended to be used through `cumulus_primitives_storage_weight_reclaim::get_proof_size`.
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Direct usage is not recommended.
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