Re: [RFC PATCH v4 5/6] drivers/migrate_offload: add DMA batch copy driver (dcbm)

[Huang, Ying]

Hi, Shivank,

Shivank Garg <shivankg@xxxxxxx> writes:

> Simple DMAEngine based driver that uses memcpy channels to batch-copy
> folios during page migration. Primarily for testing the copy offload
> infrastructure.
>
> When DMA fails the callback returns an error and the migration path
> falls back to per-folio CPU copy.
>
> Sysfs interface under /sys/kernel/dcbm/:
>   offloading      - enable/disable DMA offload
>   nr_dma_chan     - max number of DMA channels to use
>   folios_migrated - folios copied via DMA
>   folios_failures - fallback count

How about placing the sysfs interface under /sys/module/dcbm/?  We will
have multiple migrator implementations in the future, so dcbm behaves
more like a driver, right?

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Best Regards,
Huang, Ying

[snip]