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fix: preserve SWA host lock on node split #38138

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Merged
alphabetc1 merged 3 commits into from
Sep 7, 2026
Merged

fix: preserve SWA host lock on node split #38138

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6dd113f
fix: preserve SWA host lock on node split
alphabetc1 Sep 5, 2026
4a7a72b
Merge branch 'main' into fix/unified-swa-host-split-lock
alphabetc1 Sep 6, 2026
8b2b15b
Merge branch 'main' into fix/unified-swa-host-split-lock
alphabetc1 Sep 6, 2026
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20 changes: 16 additions & 4 deletions python/sglang/srt/mem_cache/unified_cache/components/swa_component.py
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Original file line number Diff line number Diff line change
Expand Up @@ -602,12 +602,24 @@ def redistribute_on_node_split(
child.component_data[self.component_type].host_value = child_swa_host_value[
split_len:
].clone()
parent_swa_data = new_parent.component_data[self.component_type]
child_swa_data = child.component_data[self.component_type]
parent_swa_data.host_lock_ref = child_swa_data.host_lock_ref
host_uuid = child_swa_data.metadata.pop("host_uuid", None)
if host_uuid is not None:
parent_swa_data.metadata["host_uuid"] = host_uuid

host_lru = self.tree_core.host_lru_lists[self.component_type]
if new_parent.component_data[self.component_type].value is None:
if (
new_parent.component_data[self.component_type].value is None
and parent_swa_data.host_lock_ref == 0
):
host_lru.insert_mru(new_parent)
if child.component_data[
self.component_type
].value is None and not host_lru.in_list(child):
if (
child.component_data[self.component_type].value is None
and child_swa_data.host_lock_ref == 0
and not host_lru.in_list(child)
):
host_lru.insert_mru(child)

# parent inherits the swa_uuid from child for swa lock ref
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