parachain-system: send core selector ump signal #5888
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| @@ -1418,6 +1429,21 @@ impl<T: Config> Pallet<T> { | |||
| CustomValidationHeadData::<T>::put(head_data); | |||
| } | |||
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| /// Send the ump signals | |||
| #[cfg(feature = "experimental-ump-signals")] | |||
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Wondering if it would be a good idea to hide the `select_core_for_child runtime API behind this feature ?
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I don't think it helps us. The parachain can implement the API without any problem. I introduced the compile-time feature because otherwise the relay chain would have rejected these candidates
| @@ -260,8 +262,7 @@ where | |||
| relay_parent, | |||
| params.para_id, | |||
| &mut params.relay_client, | |||
| // Use depth 0, to preserve behaviour. | |||
| ClaimQueueOffset(0), | |||
| ClaimQueueOffset(DEFAULT_CLAIM_QUEUE_OFFSET), | |||
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Didn't we want to use 0 to preserve old behaviour ?
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the problem with using 0 is this:
we have a DEFAULT_CLAIM_QUEUE_OFFSET of 1 (as you also suggested).
The default implementation of the SelectCore trait uses DEFAULT_CLAIM_QUEUE_OFFSET.
if we instead use here offset 0 and the runtime is updated to use offset 1, there will be a discrepancy and the collator will not advertise to the right core. we need these two places to use the same offset.
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Explanation makes sense to me, offset of 1 should also not break anything here.
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an alternative would be to set the DEFAULT_CLAIM_QUEUE_OFFSET to 0 and have some kind of LookaheadCoreSelector impl of SelectCore that uses a claim queue offset of 1.
the current state of the PR (with lookahead using offset 1) breaks the coretime-shared-core zombienet test because core sharing doesn't work between paras if one of the paras is not producing blocks. will be fixed by #5461
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actually I think using a default claim queue offset of 0 is a must, because if the UMP signal is not present, the runtime will assume offset 0: #5423
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and another reason to use default offset 0 is because the claim queue size is at least 1 (so an offset of 1 will not work on a network that is configured with size 1)
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an alternative would be to set the DEFAULT_CLAIM_QUEUE_OFFSET to 0 and have some kind of LookaheadCoreSelector impl of SelectCore that uses a claim queue offset of 1.
I've implemented this now
alindima
added
T9-cumulus
| @@ -260,8 +262,7 @@ where | |||
| relay_parent, | |||
| params.para_id, | |||
| &mut params.relay_client, | |||
| // Use depth 0, to preserve behaviour. | |||
| ClaimQueueOffset(0), | |||
| ClaimQueueOffset(DEFAULT_CLAIM_QUEUE_OFFSET), | |||
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Explanation makes sense to me, offset of 1 should also not break anything here.
Runtime side of #5048
Send the core selector ump signal in cumulus. Guarded by a compile time feature until nodes are upgraded to a version that includes #5423 for gracefully handling ump signals.