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MN0PR12MB6176.namprd12.prod.outlook.com (2603:10b6:208:3c3::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9700.11; Tue, 10 Mar 2026 10:08:01 +0000 Received: from BN9PR12MB5259.namprd12.prod.outlook.com ([fe80::122c:cca7:c2b3:90ed]) by BN9PR12MB5259.namprd12.prod.outlook.com ([fe80::122c:cca7:c2b3:90ed%3]) with mapi id 15.20.9700.010; Tue, 10 Mar 2026 10:08:01 +0000 Message-ID: <84643d33-66bd-43b7-b3b0-cb6401a134e5@amd.com> Date: Tue, 10 Mar 2026 15:37:47 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v4 4/6] mm/migrate: add copy offload registration infrastructure To: Gregory Price 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, ying.huang@linux.alibaba.com, 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mG3AWNVjUwxzkU2hHW+gE6U6UCCSk3tHAll5mTtsgZIdZtY8rZD0FV7JRd2qXPKE61aZOSkaIjCnoY4xHcapuHZy++eB1LNi08bKCqwcokNsLea5lIZzO8ZNN8Bv6C9Az7mJex8MaeOhYcmwsS7F/Leoya5Xu1HJ/+Xpom1LE2rO2rK86MB+YHr+PYdsf78QMKSVzqsUgqxUT5fPEpXkyPPfW2tDVW72EO15l2vHLYmsfxOhpDRIMJTA9KF8yqnAIbj+mMo3i+6rQrXX2O1oWm0hQmV/Y/T1oVOFc+SIy9Ss6jUGwWHhrHi5LbyN43FjJGLZm/+PzJaoyxLCbmkAhSxnisZq3ZNHwUOpVNHLOHWwIQHRcTJXT225iOfNIDlDBsY2JupSRWKxDqG4QLOmewGN4Elr1WDmxJCDptvsxlwj6LN0mlfQL22l15CVoDSMFet9YN08PCTZ/73B+X5+AXr5V+vD6ZsxTAech Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/9/2026 11:24 PM, Gregory Price wrote: > On Mon, Mar 09, 2026 at 12:07:29PM +0000, Shivank Garg wrote: > ... snip ... >> >> Only one migrator can be active a time. A second registration returns >> -EBUSY, and only the active migrator can stop itself. The static_call >> dispatch is under SRCU so synchronize_srcu() in stop path guarantees >> no in-flight copy before the module reference is dropped. >> > ... snip ... > >> @@ -1820,11 +1833,18 @@ static int migrate_pages_batch(struct list_head *from, >> >> +#ifdef CONFIG_MIGRATION_COPY_OFFLOAD >> + /* Check if the offload driver wants to batch for this reason */ >> + if (static_branch_unlikely(&migrate_offload_enabled)) >> + do_batch = static_call(migrate_should_batch)(reason); >> +#endif >> + > > should the migrate_should_batch call also be done under srcu? > > In theory it's an incredibly small window, but there is a race window. Yes, right. thanks for pointing this out. Best regards, Shivank