Re: [RFC] mmap(MAP_CONTIG)
From: Mike Kravetz <hidden>
Date: 2017-10-04 17:09:17
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On 10/04/2017 04:54 AM, Michal Nazarewicz wrote:
On Tue, Oct 03 2017, Mike Kravetz wrote:quoted
At Plumbers this year, Guy Shattah and Christoph Lameter gave a presentation titled 'User space contiguous memory allocation for DMA' [1]. The slides point out the performance benefits of devices that can take advantage of larger physically contiguous areas.Issue I have is that kind of memory needed may depend on a device. Some may require contiguous blocks. Some may support scatter-gather. Some may be behind IO-MMU and not care either way. Furthermore, I feel déjà vu. Wasn’t dmabuf supposed to address this issue?
Thanks Michal, I was unaware of dmabuf and am just now looking at capabilities. The question is whether or not the IB driver writers requesting mmap(MAP_CONTIG) functionality could make use of dmabuf. That is out of my are of expertise, so I will let them reply. -- Mike Kravetz -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>