Re: [PATCH v3] IB/mlx5: Reduce max order of memory allocated for xlt update

[Leon Romanovsky <leon@kernel.org>]

On Sat, Apr 03, 2021 at 04:53:55AM +0000, Praveen Kumar Kannoju wrote:
> To update xlt (during mlx5_ib_reg_user_mr()), the driver can request up to
> 1 MB (order-8) memory, depending on the size of the MR. This costly
> allocation can sometimes take very long to return (a few seconds). This
> causes the calling application to hang for a long time, especially when the
> system is fragmented.  To avoid these long latency spikes, the calls the
> higher order allocations need to fail faster in case they are not
> available. In order to acheive this we need __GFP_NORETRY flag in the
> gfp_mask before during fetching the free pages. This patch adds this flag
> to the mask.
> 
> Signed-off-by: Praveen Kumar Kannoju <praveen.kannoju@oracle.com>
> ---
>  drivers/infiniband/hw/mlx5/mr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Thanks a lot,
Acked-by: Leon Romanovsky <leonro@nvidia.com>