kernel/linux.git/include/net/aligned_data.h, branch v6.19.11

udp: move udp_memory_allocated into net_aligned_data

2025-07-02T21:22:02+00:00

____cacheline_aligned_in_smp attribute only makes sure to align a field to a cache line. It does not prevent the linker to use the remaining of the cache line for other variables, causing potential false sharing. Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20250630093540.3052835-5-edumazet@google.com Signed-off-by: Jakub Kicinski

tcp: move tcp_memory_allocated into net_aligned_data

2025-07-02T21:22:02+00:00

____cacheline_aligned_in_smp attribute only makes sure to align a field to a cache line. It does not prevent the linker to use the remaining of the cache line for other variables, causing potential false sharing. Move tcp_memory_allocated into a dedicated cache line. Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20250630093540.3052835-4-edumazet@google.com Signed-off-by: Jakub Kicinski

net: move net_cookie into net_aligned_data

2025-07-02T21:22:02+00:00

Using per-cpu data for net->net_cookie generation is overkill, because even busy hosts do not create hundreds of netns per second. Make sure to put net_cookie in a private cache line to avoid potential false sharing. Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20250630093540.3052835-3-edumazet@google.com Signed-off-by: Jakub Kicinski

net: add struct net_aligned_data

2025-07-02T21:22:02+00:00

This structure will hold networking data that must consume a full cache line to avoid accidental false sharing. Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20250630093540.3052835-2-edumazet@google.com Signed-off-by: Jakub Kicinski