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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/11/2026 9:20 PM, David Hildenbrand (Arm) wrote: > On 4/28/26 17:50, Shivank Garg wrote: [...] >> +static bool migrate_offload_do_batch(int reason) >> +{ >> + if (!static_branch_unlikely(&migrate_offload_enabled)) >> + return false; >> + >> + switch (reason) { >> + case MR_COMPACTION: >> + case MR_SYSCALL: >> + case MR_DEMOTION: >> + case MR_NUMA_MISPLACED: >> + return true; >> + default: >> + return false; > > > What's the exact reason we don't do this for hotunplug etc? IOW, why do we make > this depend on a reason? Reason-based filtering could be a requirement for some users who want only specific use cases to go through DMA offload. For the RFC, I introduced a placeholder to enable further discussion on which use cases should allow migration offload and whether offload users actually need this control? Your other point also makes sense: "If someone migrates a handful of folios, latency is likely more important (and batching less beneficial)." Based on this, we could either fully rely on batch size. I'll think more about this. Thanks, Shivank