[PATCH 0/3] powerpc/powernv/npu: Improve ATSD invalidation overhead

[Mark Hairgrove]

When ATS is used in a process, all CPU TLB invalidates in that process
also trigger ATSD invalidates via mmu_notifiers. This additional overhead
is noticeable in applications which do heavy memory allocation or page
migration among nodes, particularly to and from GPUs.

This patch set reduces that overhead by rearranging how the ATSDs are
issued and by using size-based ATSD invalidates.

Mark Hairgrove (3):
  powerpc/powernv/npu: Reduce eieio usage when issuing ATSD invalidates
  powerpc/powernv/npu: Use size-based ATSD invalidates
  powerpc/powernv/npu: Remove atsd_threshold debugfs setting

 arch/powerpc/platforms/powernv/npu-dma.c |  177 ++++++++++++++---------------
 1 files changed, 85 insertions(+), 92 deletions(-)

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1.7.2.5