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[KV cache] Reserve execution capacity and ownership for checkpoint restores #922

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[KV cache] Reserve execution capacity and ownership for checkpoint restores #922

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d581242
Preserve external checkpoint restores through capacity-constrained ad…
ktsaou Sep 27, 2026
351b975
Link checkpoint admission release note to PR 922
ktsaou Sep 27, 2026
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20 changes: 20 additions & 0 deletions .lil/changes/vllm-restore-admission.json
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{
"schema": "local-inference-release-change/v1",
"id": "vllm-restore-admission",
"category": "fix",
"summary": "External recurrent checkpoint restores can reserve execution capacity and retain ownership through admission.",
"models": [
"all"
],
"compatibility": "Use with the paired LMCache restore-admission change to wait for checkpoint capacity instead of recomputing cached prefixes.",
"details": [
"Restores reserve GPU blocks and running slots before copies start, and keep restored pages owned until execution takes over.",
"Sliding-window and chunked-local continuation reservations count physical pages rather than skipped positions in the block table.",
"Requests with reserved capacity can progress past a blocked queue head; cancellation releases reservations after submitted copies drain.",
"Existing external-checkpoint callers retain their previous behavior unless they opt into admission reservations."
],
"requires": [],
"pull_requests": [
922
]
}
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