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Pinned SHM arena on ROCm and one staging copy per step - #1095

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Pinned SHM arena on ROCm and one staging copy per step#1095
merceod wants to merge 5 commits into
users/atindra/pr-23-t5-hostfrom
users/atindra/pr-29-s5-pinned-arena

Commits on Nov 1, 2026
- platforms: page-lock SHM arena segments through Platform.host_register (hipHostRegister on ROCm)
  
  merceod
  authored and
  merceod
  committed
  ebcd61f
- arena: one slot and one copy per step for small device rows, and one read batch per message pass
  
  merceod
  authored and
  merceod
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  b1c4dd2
- arena: charge a read batch's copy time to its edge reads in the transfer metrics
  
  merceod
  authored and
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  074846f
- test: the GPU shared-slot test's consumer records the acks its reads send
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  42b80c1
- arena: a read batch keeps the slices of a TP-sharded tensor apart
  merceod
  committed
  777cf84