Contact
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Jan-Harald Fredriksen [GitHub]janharaldfredriksen-arm
Other Extension Metadata
- Last Modified Date
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2025-09-09
- IP Status
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No known IP claims.
- Contributors
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Jan-Harald Fredriksen, Arm Ltd.
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Lisa Wu, Arm Ltd.
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Ting Wei, Arm Ltd.
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Nikunj Patel, Arm Ltd.
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Peter Harris, Arm Ltd.
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Camden Mannett, Arm Ltd.
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Description
This extension provides the ability to capture performance counters per region ('tile').
It exposes an enumeration of the available counters, and a way to request counters to be captured per render pass instance.
New Structures
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Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
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Extending VkPhysicalDeviceProperties2:
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Extending VkRenderPassBeginInfo, VkRenderingInfo:
New Enum Constants
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VK_ARM_PERFORMANCE_COUNTERS_BY_REGION_EXTENSION_NAME -
VK_ARM_PERFORMANCE_COUNTERS_BY_REGION_SPEC_VERSION -
Extending VkStructureType:
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VK_STRUCTURE_TYPE_PERFORMANCE_COUNTER_ARM -
VK_STRUCTURE_TYPE_PERFORMANCE_COUNTER_DESCRIPTION_ARM -
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PERFORMANCE_COUNTERS_BY_REGION_FEATURES_ARM -
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PERFORMANCE_COUNTERS_BY_REGION_PROPERTIES_ARM -
VK_STRUCTURE_TYPE_RENDER_PASS_PERFORMANCE_COUNTERS_BY_REGION_BEGIN_INFO_ARM
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Issues
What is the security model of this extension?
RESOLVED
The GPU hardware is able to run workloads from multiple applications concurrently. This introduces the possibility of side-channel leaks where one process can observe the side effects (e.g., memory pressure) of work done in another process.
To prevent such leaks when using this extension, the following is guaranteed:
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Command buffers that capture performance counters are automatically executed in an “exclusive mode”, meaning that they do not run concurrently with workloads from any other process.
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The physical device, at the level of hardware and firmware, guarantees that performance counters are only captured in “exclusive mode”, and otherwise returns zero for all counters.
Additionally, this performance counter mechanism only exposes shader core counters. Counters related to the external memory system or interactions between external memory and L2 caches are not available.
Document Notes
For more information, see the Vulkan Specification.
This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.