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[FA] reuse max_seq_len for prefill_max_seq_len #286

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[FA] reuse max_seq_len for prefill_max_seq_len #286

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8 changes: 4 additions & 4 deletions vllm_metax/v1/attention/backends/flash_attn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -640,10 +640,10 @@ def build(
- common_attn_metadata.query_start_loc[num_decodes]
)
prefill_seq_lens = common_attn_metadata.seq_lens[num_decodes:num_reqs]
prefill_seq_lens_cpu = common_attn_metadata.seq_lens_cpu[
num_decodes:num_reqs
]
prefill_max_seq_len = int(prefill_seq_lens_cpu.max().item())
# max_seq_len already bounds the prefill rows and is all that
# max_seqlen_k needs, so reuse it instead of slicing the deprecated
# seq_lens_cpu just to take its max.
prefill_max_seq_len = max_seq_len
prefill_block_table_tensor = common_attn_metadata.block_table_tensor[
num_decodes:num_reqs
]
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