Keep delegate-consumed mutable buffers above the delegate (#21507) - #21507
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21507
Note: Links to docs will display an error until the docs builds have been completed. ✅ No FailuresAs of commit 6829cff with merge base 644990e ( This comment was automatically generated by Dr. CI and updates every 15 minutes. |
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) Summary: `tag_constant_data` freezes a const/param/buffer into a delegate when all of its users are partitioned. It recognized a *mutated* buffer only when a direct user's node name is a key in `buffers_to_mutate`. That misses the case where a buffer both feeds a delegate and is mutated *inside* it: the mutation is produced by a `getitem` off the `call_delegate`, so the buffer's only direct user is the delegate node (whose name is not a `buffers_to_mutate` key), and the buffer is wrongly frozen as constant data instead of staying a method-owned mutable buffer. Additionally treat a placeholder as a mutated buffer when its FQN is a `buffers_to_mutate` target, so a buffer a delegate updates in place stays owned above the delegate. This is the case anticipated by `test_not_delegate_mutable_buffers` ("consider when the delegate can consume the mutable buffer") — e.g. a backend that embeds a pre-compiled engine which updates a KV cache in place. Authored with AI assistance (Claude Code). Differential Revision: D114288921
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) Summary: `tag_constant_data` freezes a const/param/buffer into a delegate when all of its users are partitioned. It recognized a *mutated* buffer only when a direct user's node name is a key in `buffers_to_mutate`. That misses the case where a buffer both feeds a delegate and is mutated *inside* it: the mutation is produced by a `getitem` off the `call_delegate`, so the buffer's only direct user is the delegate node (whose name is not a `buffers_to_mutate` key), and the buffer is wrongly frozen as constant data instead of staying a method-owned mutable buffer. Additionally treat a placeholder as a mutated buffer when its FQN is a `buffers_to_mutate` target, so a buffer a delegate updates in place stays owned above the delegate. This is the case anticipated by `test_not_delegate_mutable_buffers` ("consider when the delegate can consume the mutable buffer") — e.g. a backend that embeds a pre-compiled engine which updates a KV cache in place. Authored with AI assistance (Claude Code). Differential Revision: D114288921
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) Summary: `tag_constant_data` freezes a const/param/buffer into a delegate when all of its users are partitioned. It recognized a *mutated* buffer only when a direct user's node name is a key in `buffers_to_mutate`. That misses the case where a buffer both feeds a delegate and is mutated *inside* it: the mutation is produced by a `getitem` off the `call_delegate`, so the buffer's only direct user is the delegate node (whose name is not a `buffers_to_mutate` key), and the buffer is wrongly frozen as constant data instead of staying a method-owned mutable buffer. Additionally treat a placeholder as a mutated buffer when its FQN is a `buffers_to_mutate` target, so a buffer a delegate updates in place stays owned above the delegate. This is the case anticipated by `test_not_delegate_mutable_buffers` ("consider when the delegate can consume the mutable buffer") — e.g. a backend that embeds a pre-compiled engine which updates a KV cache in place. Authored with AI assistance (Claude Code). Differential Revision: D114288921
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Summary:
tag_constant_datafreezes a const/param/buffer into a delegate when all of itsusers are partitioned. It recognized a mutated buffer only when a direct user's
node name is a key in
buffers_to_mutate. That misses the case where a bufferboth feeds a delegate and is mutated inside it: the mutation is produced by a
getitemoff thecall_delegate, so the buffer's only direct user is thedelegate node (whose name is not a
buffers_to_mutatekey), and the buffer iswrongly frozen as constant data instead of staying a method-owned mutable buffer.
Additionally treat a placeholder as a mutated buffer when its FQN is a
buffers_to_mutatetarget, so a buffer a delegate updates in place stays ownedabove the delegate. This is the case anticipated by
test_not_delegate_mutable_buffers("consider when the delegate can consume themutable buffer") — e.g. a backend that embeds a pre-compiled engine which updates
a KV cache in place.
Authored with AI assistance (Claude Code).
Differential Revision: D114288921