答复: [PATCH][rdma-next] RDMA/mlx5: Use NUMA-aware allocation for memory region descriptors

["Li,Rongqing(ACG CCN)" <lirongqing@baidu.com>]

> The mlx5_alloc_priv_descs() function currently uses kzalloc(), which allocates
> memory on the NUMA node of the calling CPU. On multi-socket systems, this
> can lead to cross-node memory access if the HCA is attached to a different
> NUMA node than the process allocating the Memory Region (MR).
> 
> Switch to kzalloc_node() and specify the node associated with the HCA's DMA
> device. This ensures that the MR descriptors are resident on the local NUMA
> node, reducing latency for hardware access.
> 
> Signed-off-by: Li RongQing <lirongqing@baidu.com>

ping

[Li,Rongqing] 



> ---
>  drivers/infiniband/hw/mlx5/mr.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
> index 665323b..5f4b4da 100644
> --- a/drivers/infiniband/hw/mlx5/mr.c
> +++ b/drivers/infiniband/hw/mlx5/mr.c
> @@ -1990,7 +1990,8 @@ mlx5_alloc_priv_descs(struct ib_device *device,
>  		add_size = min_t(int, end - size, add_size);
>  	}
> 
> -	mr->descs_alloc = kzalloc(size + add_size, GFP_KERNEL);
> +	mr->descs_alloc = kzalloc_node(size + add_size, GFP_KERNEL,
> +			dev_to_node(ddev));
>  	if (!mr->descs_alloc)
>  		return -ENOMEM;
> 
> --
> 2.9.4