netdev - Re: [PATCH 1/1] net/rds: suppress page allocation failure error in recv buffer refill

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Date:   Mon, 5 Oct 2020 14:39:16 -0700
From:   Manjunath Patil <manjunath.b.patil@...cle.com>
To:     David Miller <davem@...emloft.net>
Cc:     santosh.shilimkar@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, aruna.ramakrishna@...cle.com,
        rama.nichanamatlu@...cle.com
Subject: Re: [PATCH 1/1] net/rds: suppress page allocation failure error in
 recv buffer refill

Thanks David for your feedback.

I will submit v3 of this patch removing the warning.

-Manjunath
On 10/3/2020 5:26 PM, David Miller wrote:
> From: Manjunath Patil <manjunath.b.patil@...cle.com>
> Date: Fri,  2 Oct 2020 13:05:45 -0700
>
>> RDS/IB tries to refill the recv buffer in softirq context using
>> GFP_NOWAIT flag. However alloc failure is handled by queueing a work to
>> refill the recv buffer with GFP_KERNEL flag. This means failure to
>> allocate with GFP_NOWAIT isn't fatal. Do not print the PAF warnings if
>> softirq context fails to refill the recv buffer, instead print rate
>> limited warnings.
>>
>> Signed-off-by: Manjunath Patil <manjunath.b.patil@...cle.com>
>> Reviewed-by: Aruna Ramakrishna <aruna.ramakrishna@...cle.com>
> Honestly I don't think the subsystem should print any warning at all.
>
> Either it's a softirq failure, and that's ok because you will push
> the allocation to GFP_KERNEL via a work job.  Or it's a GFP_KERNEL
> failure in non-softirq context and the kernel will print a warning
> and a stack backtrace from the memory allocator.
>
> Therefore, please remove all of the warnings in the rds code.
>
> Thanks.