Re: [PATCH v4 4/4] dma-buf: heaps: add chunk heap to dmabuf heaps

[Minchan Kim]

On Tue, Jan 26, 2021 at 08:46:05AM +0100, Michal Hocko wrote:
> On Thu 21-01-21 09:55:02, Minchan Kim wrote:
> > From: Hyesoo Yu <hyesoo.yu@xxxxxxxxxxx>
> > 
> > This patch supports chunk heap that allocates the buffers that
> > arranged into a list a fixed size chunks taken from CMA.
> > 
> > The chunk heap driver is bound directly to a reserved_memory
> > node by following Rob Herring's suggestion in [1].
> > 
> > [1] https://lore.kernel.org/lkml/20191025225009.50305-2-john.stultz@xxxxxxxxxx/T/#m3dc63acd33fea269a584f43bb799a876f0b2b45d
> 
> Who is using this allocator in the kernel?

Userspace uses the memory via mapping it via dmabuf.