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

[Garg, Shivank]

On 3/24/2026 1:40 PM, Huang, Ying wrote:
> 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?
> 

Good point, I'll move it to /sys/module/dcbm.

Thanks for the review :)

Thanks,
Shivank