From: "Huang, Ying" <ying.huang@linux.alibaba.com>
To: Shivank Garg <shivankg@amd.com>
Cc: <akpm@linux-foundation.org>, <david@kernel.org>,
<lorenzo.stoakes@oracle.com>, <Liam.Howlett@oracle.com>,
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<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: Tue, 24 Mar 2026 16:10:43 +0800 [thread overview]
Message-ID: <874im51wcc.fsf@DESKTOP-5N7EMDA> (raw)
In-Reply-To: <20260309120725.308854-14-shivankg@amd.com> (Shivank Garg's message of "Mon, 9 Mar 2026 12:07:31 +0000")
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?
---
Best Regards,
Huang, Ying
[snip]
next prev parent reply other threads:[~2026-03-24 8:11 UTC|newest]
Thread overview: 33+ 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
2026-04-07 6:52 ` Huang, Ying
2026-04-23 12:20 ` 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
2026-04-07 7:40 ` Huang, Ying
2026-04-28 12:10 ` Garg, Shivank
2026-04-30 1:23 ` Huang, Ying
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 [this message]
2026-04-03 11:06 ` Garg, Shivank
2026-04-23 12:10 ` Garg, Shivank
2026-04-23 14:13 ` Vinod Koul
2026-04-24 11:26 ` Garg, Shivank
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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