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Received: from DESKTOP-5N7EMDA(mailfrom:ying.huang@linux.alibaba.com fp:SMTPD_---0X.dvi7y_1774339843 cluster:ay36) by smtp.aliyun-inc.com; Tue, 24 Mar 2026 16:10:53 +0800 From: "Huang, Ying" To: Shivank Garg Cc: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [RFC PATCH v4 5/6] drivers/migrate_offload: add DMA batch copy driver (dcbm) In-Reply-To: <20260309120725.308854-14-shivankg@amd.com> (Shivank Garg's message of "Mon, 9 Mar 2026 12:07:31 +0000") References: <20260309120725.308854-3-shivankg@amd.com> <20260309120725.308854-14-shivankg@amd.com> Date: Tue, 24 Mar 2026 16:10:43 +0800 Message-ID: <874im51wcc.fsf@DESKTOP-5N7EMDA> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=ascii X-Rspam-User: X-Rspamd-Queue-Id: 572DE4000C X-Stat-Signature: adp3ktfz13xt93xx3f5rfryckg5b9rn5 X-Rspamd-Server: rspam06 X-HE-Tag: 1774339859-864872 X-HE-Meta: U2FsdGVkX1/7YGA9zmdlBDvLOKHBeh5DaSdB9zQ7s39QI2oGIDfIjrw6nlC+lL3UtbJKc6VnRvQu0rzgYI+yZ4Zr/rdQQcFg76Q18mthNREl1/wmXTFK3GwXVUlP0s/SLBYrwR1ZRpbxPUXrADfJgTdiCWraPkn3ERXjzZ+mTaokg2e9v2z3+8k1vLxpU2SAZTgmWfdmimAMZtvy1qve+siYdC5Bp/1jseS0B6yYD2IxGDqgRTLSxT5KM/TmbBtO+CmplxP1UCkJqK7c7A3xmYdLGpit1fpfhhpnbiaDpGPu8nXlLDNjr2+DvImNWQDRttkh4prvTtca8zUj4JEkstbB0rCyRJcQu7SKYzJU2ocint0mrEXiagsrD/Q4LNRoxkbCa4wyM2Bgfv605yBB48l1SGq1ep+toHq+QBoVrfK3LP+kS26lbk6ylj4bmhy/KRP4JfGVkK56ELkQl6jOOnDmKW/1tODr0kuAqjiHcys1aDypDzRyDZEwjDwjp0AgVE4kLz3CN2BJMlFW0ZNqL265lS/pGED/UWoXvsn4bH16QFjA9JBGawC0280l2oU1H9/AOPQSrmPRvR9+pKjgYB6GTbwKWVruXooskGzScA7+jGGYSZaZFZ3nahsL2m3XmZITpPO6b1Vd6YbtiMoVcU2M14fIbXXrA0n0fJvVfycDj9W/jmKpLoHlXj+GW0kAt8N35zRbHP+FUmKBS4pOGypQou0enrc/EstEMr3IpxpbMpsuMsTGnZSVzQPrn0gwLDufuUi4LziSj4OAi/wADwz/EGD2wBGpBb6YgezvSHsYvwD/Mzv+AJvvoTiOriUVevHq3oFpghSjTRANOboR652hZ8XsKJDBAHMrcgRUJOoyuTLDpuYWgDB1R0YAHhzfN54g4kbXFUYiLIEz7LKZKB5PfHYyNFsVVR5g2dxYXexyxC+UtSAXrbsQ/7+6pPIFZZg0RMWESdGRFcDsJZm H0OqJqGu LC5ibau7+4Q5Z059jtHp6MWGmm9rKQypvULxbQKxBffeOafo7wQx/jpYT5lNRIygCzS094dnB9AiczBKrUEqrE5fn5mzNnkF515mTUDI9XxWFbDEQgLUUYIB8Tq26JGvLHKGRSxRNrGqLWNgYlBJmfr2AmTJMuyaHRqPw9+PQ70+ZDNeM3rKzJvqg1cRFJNA3FvpapTwRd+25dfkc/US+rXH81jeU6aYeqZJoPgzBIly3sxHowv+VrtTD/T+sBRg3EJzSvqp7JANiHnSznA+9c+hm+O0FelkBA3BeR9mkenksItxmO1nz7lStv5BUYH/07cXSQmmlfJoh/anb8X/wSydN/LXnLaGgiWtlp8dHdvBdmcE4t9rLF1GvkTwU+1jRCLp7Bi8YdHUOVJpzTrFdDuPeUrrD7kGvKS3u Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, Shivank, Shivank Garg 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]