Using process address space on the GPU
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1 Using process address space on the GPU Jérôme Glisse September 2013 Jérôme Glisse - Using process address space on the GPU 1/18
2 Outline Motivation Memory management Hardware solution Software solution On the graphic side Jérôme Glisse - Using process address space on the GPU 2/18
3 The middle man v o i d vec add ( f l o a t vr, f l o a t va, f l o a t vb, u n s i g n e d s { gpu bo gpu a, gpu b, gpu r ; gpu a = g p u a l l o c ( s i z e o f ( f l o a t ) s i z e ) ; gpu b = g p u a l l o c ( s i z e o f ( f l o a t ) s i z e ) ; gpu r = g p u a l l o c ( s i z e o f ( f l o a t ) s i z e ) ; gpu upload ( gpu a, va, s i z e o f ( f l o a t ) s i z e ) ; gpu upload ( gpu b, vb, s i z e o f ( f l o a t ) s i z e ) ; g p u s h a d e r e x e c u t e ( v e c a d d s h a d e r, gpu r, gpu a, gpu b gpu downoad ( gpu r, vr, s i z e o f ( f l o a t ) s i z e ) ; } Jérôme Glisse - Using process address space on the GPU 3/18
4 Cut the middle man v o i d vec add ( f l o a t vr, f l o a t va, f l o a t vb, u n s i g n e d s { g p u s h a d e r e x e c u t e ( v e c a d d s h a d e r, vr, va, vb, s i z e ) ; } Jérôme Glisse - Using process address space on the GPU 4/18
5 Memory management inherently concurrent Pagetable concurrent update Userspace map/unmap. Memory reclaim. Deduplication (KSM). Migration (NUMA architecture). Compaction.... The more memory pressure the more concurrent update. Jérôme Glisse - Using process address space on the GPU 5/18
6 Synchronization Pagetable update Concurrency imply no serialization. Pagetable is synchronization point. Save pte (pagetable entry). Perform job (swapping, migrating,...). Check pte is same if so update, otherwise back off. Page backing an address might change at any time. Pinning would defeat memory management. Taking reference defeat memory management too. Jérôme Glisse - Using process address space on the GPU 6/18
7 Notify me Virtualization Host kernel has global overview. Guest kernel has local overview. Efficiency needs communication both ways. Meet the mmu notifier API Bracket large pagetable update with range start/end callback. Allow proper youngness accounting... No serialization, concurrent notification on overlapping range. Jérôme Glisse - Using process address space on the GPU 7/18
8 Moving target Catch me if you can Pagetable is a moving target. Page behind an address might change at any time. Playing catchup. Mirroring process address space requirements Both CPU and GPU use same page for same address. Concurrent access by both (in most cases at least). No pinning. No references.... Jérôme Glisse - Using process address space on the GPU 8/18
9 Road forks Hardware solution. Software solution. Jérôme Glisse - Using process address space on the GPU 9/18
10 Meet the new middle man, IOMMU IOMMU original motivation I/O protection and isolation (security). Easy remapping and scatter gather. Middle man between device and system memory. Virtualization and device isolation.... IOMMU unique position Middle man. Close CPU (same die since memory controller got merge). IOMMU can be tie to specific CPU. IOMMU can understand CPU pagetable format. IOMMU can walk any process pagetable and relay information. Jérôme Glisse - Using process address space on the GPU 10/18
11 IOMMU and the PCIE ATS/PASID case PASID PCIE specification PASID = Process address space identifiant. Unique ID associated with a process and thus a pagetable. Device can tell IOMMU which process they are interested in.... ATS PCIE specification ATS = address translation service. IOMMU translate virtual address to physical address. Device can cash in TLB IOMMU translation. Device must offer TLB flush/invalidation mechanism. Carry over protection (read, write, execute,...)... Jérôme Glisse - Using process address space on the GPU 11/18
12 How device make use of address translation Device pagetable case Device manage its own pagetable, a bit flag in each entry tell if the address should use IOMMU address translation or not. Flexible, can mix VRAM and SRAM. Flag on any level of the pagetable (TLB cache optimization). Complex TLB cache and memory controller. Device use aperture case Address inside (or outside) aperture use ATS/PASID. Address outside (or inside) usual device memory controller. Not flexible. Coarse granularity. Simpler memory controller and TLB cache. Jérôme Glisse - Using process address space on the GPU 12/18
13 The limits of hardware solution Partial solution One way, device asking pagetable controlled by CPU. Can not copy temporarily data into VRAM. IOMMUv2 linux limitations IOMMU use empty pagetable during CPU pagetable update : Add latency Can be very frequent with memory pressure. Solvable by adding a flag to CPU pagetable entry Jérôme Glisse - Using process address space on the GPU 13/18
14 GPUs are VRAM junkies Never fast enough, never big enough GPU crave for big bandwidth and low latency. VRAM up to 200GB/s vs 20GB/s for system memory. Up to 4 times lower latency with VRAM. Such bandwith unlikely to happen soon for system memory. Software solution Use of VRAM require change to linux kernel. Kernel must know about VRAM and where are things. Not exclusive with hardware solution. Software can handle VRAM object only. Jérôme Glisse - Using process address space on the GPU 14/18
15 Challenges Serialize Device pagetable update can not be done from CPU. Serialization between CPU and device pagetable. Pagetable coherency (same page backing same address). Serialization might badly hurt performances. Minimize Minimize changes needed to core mm codepath. Avoid disruptive changes. Do not break linux API (like memory cgroup). Add another point of failure for process or file corruption.... Jérôme Glisse - Using process address space on the GPU 15/18
16 It is happening Partnership between NVidia and Red Hat. Working prototype. Should be soon send as an RFC upstream. Jérôme Glisse - Using process address space on the GPU 16/18
17 Open and useful to other Generic device agnostic API. No assumption on what the device do. Useful for any hardware with : Pagetable and support true pagefault. Support read only page entry. Preemptable workload. Page size on the device can be different from the CPU. Best to have : Dirty accounting to avoid over dirtying. Fast preemption. Fast device page table update.... Jérôme Glisse - Using process address space on the GPU 17/18
18 Graphic use case Texture upload without memcpy. Next sparse texture extension automatic load from disk. GL using process address for seemless compute shader. Cache policy need custom API (UC, WC,...). Jérôme Glisse - Using process address space on the GPU 18/18
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