lkml.org 
[lkml]   [2018]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH V2] mlx4_core: allocate ICM memory in page size chunks
From
Date


On 5/15/2018 12:08 PM, Eric Dumazet wrote:
>
> 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.

Thanks for the review. There are many places in kernel and applications
where physically contiguous pages are needed.
We saw quite a few issues when there were not enough contiguous phy mem
available. My main concern here is that why
using physically contiguous pages when they are not really needed?




\
 
 \ /
  Last update: 2018-05-15 21:46    [W:0.057 / U:0.968 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site