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ZrxPMTP9AojOt4VKWVx6v2qo0ldrGbJyKTLruGGo0Vq7O5MFw3HTm7GEXfq8Yl9r2RteT+Nae9jxGrCHQ49wqu/XEDlvCnvqLx2daVWeHRv+AdwGaFD9nGt9Z8KS30SezhPo49is2sJzB8PES/dTroaIFDhY6ju4bdYAeC/piWOYMm5ZpYFnAYOQWG4AsYwzO5CKmJJtmdMS1QBEcpnQeH3CL4+wQIOx8LT2QtHCuJiZ7XIjyKwDRSy7E3OWveD3YoMna3LAkB21srkCpcoVe5CfMoitKuKx5Nwy+UzvFzBaR5Pmry4piAeUYyBvFZkx1VQ+/50nAtqziO89soR21fCu6iFMHZ7q9Kse/ZiuNzpeEomVUdJSANqfT86aHLa8R+MJZfNW1+KXNdLLUhMRMAmabKMMo5xD9PaqikbFOeb7nLZW3+663ZJQsoM0j43wjNYdj7jxQqeG3BzaCWLMhKQq5v/GxN5jjkuIYxDo/A3bcglI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 24.08.26 17:29, Luigi Rizzo wrote: > Conditionally divert receive buffer allocations in page_pool > to the SWIOTLB page allocator. > > This only happens when swiotlb usage is below the threshold set by module > parameter swiotlb.nocopy_rx_percent (default 0, range 0..90). > A value of 0 disables the feature. > > To prevent existing DRAM or SWIOTLB pages from circulating indefinitely > in the lockless receive ring after changing the parameter at runtime, > __page_pool_put_page() checks residency against the active parameter > state. Mismatched pages are immediately evicted back to their > respective allocators, achieving rapid, lockless mode conversion across > active network streams without requiring interface or queue resets. > This could be a separate page_pool allocator. It could be similar to how ZC works: pre-allocate some coherent DMA buffers and allocate from there. Thanks, Dragps