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SubjectRe: [PATCH V2] mlx4_core: allocate ICM memory in page size chunks
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On 05/15/2018 11:53 AM, Qing Huang wrote:
>
>> This is control path so it is less latency-sensitive.
>> Let's not produce unnecessary degradation here, please call kvzalloc so we maintain a similar behavior when contiguous memory is available, and a fallback for resiliency.
>
> No sure what exactly degradation is caused by vzalloc here. I think it's better to keep physically contiguous pages
> to other requests which really need them. Besides slow path/mem compacting can be really expensive.
>

Just use kvzalloc(), and you get the benefit of having contiguous memory if available,
without expensive compact phase.

This thing _automatically_ falls back to vmalloc(), thus your problem will be solved.

If you are not sure, trust others.


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