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From: "Garg, Shivank" <shivankg@amd.com>
To: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: akpm@linux-foundation.org, david@kernel.org,
	lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com,
	vbabka@kernel.org, willy@infradead.org, rppt@kernel.org,
	surenb@google.com, mhocko@suse.com, ziy@nvidia.com,
	matthew.brost@intel.com, joshua.hahnjy@gmail.com,
	rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net,
	apopple@nvidia.com, dave@stgolabs.net,
	Jonathan.Cameron@huawei.com, rkodsara@amd.com, vkoul@kernel.org,
	bharata@amd.com, sj@kernel.org, weixugc@google.com,
	dan.j.williams@intel.com, rientjes@google.com,
	xuezhengchu@huawei.com, yiannis@zptcorp.com,
	dave.hansen@intel.com, hannes@cmpxchg.org, jhubbard@nvidia.com,
	peterx@redhat.com, riel@surriel.com, shakeel.butt@linux.dev,
	stalexan@redhat.com, tj@kernel.org, nifan.cxl@gmail.com,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC PATCH v4 5/6] drivers/migrate_offload: add DMA batch copy driver (dcbm)
Date: Fri, 3 Apr 2026 16:36:32 +0530	[thread overview]
Message-ID: <198ca11f-8918-4f47-afad-e8ff14643254@amd.com> (raw)
In-Reply-To: <874im51wcc.fsf@DESKTOP-5N7EMDA>



On 3/24/2026 1:40 PM, Huang, Ying wrote:
> Hi, Shivank,
> 
> Shivank Garg <shivankg@amd.com> 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



  reply	other threads:[~2026-04-03 11:06 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-09 12:07 [RFC PATCH v4 0/6] Accelerate page migration with batch copying and hardware offload Shivank Garg
2026-03-09 12:07 ` [RFC PATCH v4 1/6] mm: introduce folios_mc_copy() for batch folio copying Shivank Garg
2026-03-12  9:41   ` David Hildenbrand (Arm)
2026-03-15 18:09     ` Garg, Shivank
2026-03-09 12:07 ` [RFC PATCH v4 2/6] mm/migrate: skip data copy for already-copied folios Shivank Garg
2026-03-12  9:44   ` David Hildenbrand (Arm)
2026-03-15 18:25     ` Garg, Shivank
2026-03-23 12:20       ` David Hildenbrand (Arm)
2026-03-24  8:22   ` Huang, Ying
2026-04-03 11:08     ` Garg, Shivank
2026-03-09 12:07 ` [RFC PATCH v4 3/6] mm/migrate: add batch-copy path in migrate_pages_batch Shivank Garg
2026-03-24  8:42   ` Huang, Ying
2026-04-03 11:09     ` Garg, Shivank
2026-03-09 12:07 ` [RFC PATCH v4 4/6] mm/migrate: add copy offload registration infrastructure Shivank Garg
2026-03-09 17:54   ` Gregory Price
2026-03-10 10:07     ` Garg, Shivank
2026-03-24 10:54   ` Huang, Ying
2026-04-03 11:11     ` Garg, Shivank
2026-03-09 12:07 ` [RFC PATCH v4 5/6] drivers/migrate_offload: add DMA batch copy driver (dcbm) Shivank Garg
2026-03-09 18:04   ` Gregory Price
2026-03-12  9:33     ` Garg, Shivank
2026-03-24  8:10   ` Huang, Ying
2026-04-03 11:06     ` Garg, Shivank [this message]
2026-03-09 12:07 ` [RFC PATCH v4 6/6] mm/migrate: adjust NR_MAX_BATCHED_MIGRATION for testing Shivank Garg
2026-03-18 14:29 ` [RFC PATCH v4 0/6] Accelerate page migration with batch copying and hardware offload Garg, Shivank

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