On Wed, Oct 30, 2024 at 12:16:22PM +0100, metux wrote: > On 22.10.24 10:38, Maxime Ripard wrote: > > I'm still interested in merging a carve-out driver[1], since it seems to be > > in every vendor BSP and got asked again last week. > > > > I remember from our discussion that for new heap types to be merged, we > > needed a kernel use-case. Looking back, I'm not entirely sure how one > > can provide that given that heaps are essentially facilities for > > user-space. > > For those who didn't follow your work, could you please give a short > intro what's that all about ? > > If I understand you correctly, you'd like the infrastructure of > kmalloc() et al for things / memory regions that aren't the usual heap, > right ? No, not really. The discussion is about dma-buf heaps. They allow to allocate buffers suitable for DMA from userspace. It might or might not from the system memory, at the heap driver discretion. > What's the practical use case ? GPU memory ? Shared memory between > nodes in a multi-CPU / cluster machine ? > > Is it related to NUMA ? And since it's about DMA, it doesn't have much to do with CPUs either. Maxime
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