[Cpp API Compatibility] Remove deepep legacy apis

[youge325]

PR Category

Execute Infrastructure

PR Types

Improvements

Description

拆分自 #78484

是否引起精度变化

否

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[Copilot]

Pull request overview

This PR continues the C++ API compatibility cleanup by removing DeepEP-specific legacy stream/event APIs from the compat headers, aiming to converge on a PyTorch-shaped surface.

Changes:

• Tighten CUDA stream pool initialization by adding error checking and align getStreamFromPool overload shape to support an int priority entry point.
• Remove deprecated legacy APIs that exposed raw CUDA streams (CUDAStream::raw_stream(), Event::record(cudaStream_t), and Tensor::record_stream(cudaStream_t / at::cuda::CUDAStream)).
• Expose c10::Stream into namespace at to support at::Stream usage.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
paddle/phi/api/include/compat/c10/cuda/CUDAStream.h	Adds C10_CUDA_CHECK for priority range init; adds priority-based getStreamFromPool overload and maps bool overload to it.
paddle/phi/api/include/compat/c10/core/Stream.h	Introduces at::Stream aliasing/export of c10::Stream.
paddle/phi/api/include/compat/c10/core/Event.h	Removes legacy record(cudaStream_t) overload.
paddle/phi/api/include/compat/ATen/ops/record_stream.h	Removes legacy record_stream overloads taking at::cuda::CUDAStream and cudaStream_t.
paddle/phi/api/include/compat/ATen/core/TensorBody.h	Removes corresponding legacy record_stream declarations from Tensor.

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[Copilot]

Adding namespace at { using c10::Stream; } here conflicts with an existing at::Stream definition in paddle/phi/api/include/compat/ATen/core/TensorBody.h (currently using Stream = c10::Stream;). Since TensorBody.h includes <c10/core/Stream.h>, this will trigger a redefinition error when compiling any TU that includes ATen/core/TensorBody.h.

To fix: keep a single canonical at::Stream definition (either remove the Stream alias from TensorBody.h, or drop this new at::Stream export and rely on the existing one).

Suggested change

	namespace at {
	using c10::Stream;
	}

[youge325]

/re-run all-failed

[youge325]

/re-run all-failed

[ShigureNyako]

这轮清理方向和 PyTorch 对齐本身我认可：

• c10::cuda::CUDAStream 上游只有 stream()，没有 raw_stream()
• c10::Event 上游只有 record(const Stream&)
• getStreamFromPool 也确实有 int priority 形态

但当前时点我还是得先卡住，因为这会造成明确的 BREAKING CHANGE，且下游闭环还没完成：

1. PaddleFleet develop 目前仍固定 third_party/DeepEP 在 3fed158b4751a4a89c92902aeb20bb8c8384f1e7。
2. 这个版本的 DeepEP 还在直接使用这次要删掉的旧接口：
   • csrc/event.hpp：event->record(const cudaStream_t&)、at::cuda::getCurrentCUDAStream().raw_stream()
   • csrc/deep_ep.cpp：多处 t.record_stream(comm_stream)，其中 comm_stream 仍是 cudaStream_t
3. DeepEP 侧迁移 PR PFCCLab/DeepEP#10 虽然已经合到了 paddle 分支（merge commit 5f63568c9810b53e999fa56fd6981c40ba4a5d57），但 PaddleFleet 这边还没有把 third_party/DeepEP bump 过去。
4. 当前 PaddleFleet #712 标题写的是 “update submodule DeepEP”，但 diff 实际只改了 third_party/DeepGEMM，没有更新 third_party/DeepEP，所以还不能作为这个 cleanup 的解锁证据。

因此“暂时不能合入”这个判断我认为仍然成立。
请先把 PaddleFleet / 实际下游切到不依赖 raw_stream() / Event::record(cudaStream_t) / Tensor::record_stream(cudaStream_t) 的版本，并给出对应 cross-reference / CI 证据，再来清理这批兼容接口。

[ShigureNyako]

我重新看了这次 force-push。

当前 diff 相比上一版，主要是：

• 删除 Tensor::record_stream(cudaStream_t) 的 TODO / 测试；
• 保留 Tensor::record_stream(at::cuda::CUDAStream)，实现改为转发到 record_stream(s.unwrap())；
• 继续移除 Event::record(cudaStream_t) 和 CUDAStream::raw_stream()。

这些调整没有改变我上一轮卡住的核心点：下游闭环还没完成。

到目前为止，PaddlePaddle/PaddleFleet#712 的 head 仍然是 9789e7f，diff 也仍只改了 third_party/DeepGEMM，没有把 third_party/DeepEP bump 到兼容这批删除项的版本，所以还不能作为“下游已经切完”的证据。

因此我这边 blocker 维持不变：还是需要先补齐 DeepEP / PaddleFleet 侧的实际切换，以及对应的 cross-reference / CI 证据，再来清理这批兼容接口。

[youge325]

/re-run all-failed

[codecov-commenter]

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