linux-kernel - Re: [PATCH V4] mlx4_core: allocate ICM memory in page size chunks

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Date:   Wed, 30 May 2018 10:39:14 -0700
From:   Qing Huang <qing.huang@...cle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     tariqt@...lanox.com, haakon.bugge@...cle.com,
        yanjun.zhu@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        gi-oh.kim@...fitbricks.com
Subject: Re: [PATCH V4] mlx4_core: allocate ICM memory in page size chunks



On 5/29/2018 8:49 PM, Eric Dumazet wrote:
>
> On 05/29/2018 11:44 PM, Eric Dumazet wrote:
>
>> And I will add this simple fix, this really should address your initial concern much better.
>>
>> @@ -99,6 +100,8 @@ static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order,
>>   {
>>          struct page *page;
>>   
>> +       if (order)
>> +               gfp_mask |= __GFP_NORETRY;
>      and also      gfp_mask &= ~__GFP_DIRECT_RECLAIM
>

Would this just fail the allocation without trying to reclaim memory 
under memory pressure? We've tried something similar but it didn't fix 
the original problem we were facing.


>>          page = alloc_pages_node(node, gfp_mask, order);
>>          if (!page) {
>>                  page = alloc_pages(gfp_mask, order);
>>