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

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Message-ID: <20210407233139.GA605674@nvidia.com>
Date:   Wed, 7 Apr 2021 20:31:39 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Praveen Kumar Kannoju <praveen.kannoju@...cle.com>
Cc:     leon@...nel.org, dledford@...hat.com, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        rajesh.sivaramasubramaniom@...cle.com,
        rama.nichanamatlu@...cle.com, aruna.ramakrishna@...cle.com,
        jeffery.yoder@...cle.com
Subject: Re: [PATCH v3] IB/mlx5: Reduce max order of memory allocated for xlt
 update

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@...cle.com>
> Acked-by: Leon Romanovsky <leonro@...dia.com>
> ---
>  drivers/infiniband/hw/mlx5/mr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied to for-next, thanks

Jason