intel_upload_blit_large_gtt

This is not a standalone Linux command executable from the user space terminal. Therefore, it does not have a conventional command synopsis with options or arguments. Instead, "intel_upload_blit_large_gtt" is an internal kernel-level identifier, possibly a function name or a tracepoint, within the Intel i915 kernel graphics driver. It's part of the kernel's internal logic for managing graphics memory and operations.

N/A
    As "intel_upload_blit_large_gtt" is an internal kernel identifier and not a user-executable command, it does not accept any user-facing parameters or options. Its behavior is dictated by the internal logic of the Intel graphics driver within the Linux kernel.

The string "intel_upload_blit_large_gtt" is not a direct Linux command but rather an internal identifier likely referring to a function, tracepoint, or event within the Linux kernel's Intel graphics driver (i915 module). It signifies a specific operation involving the upload of data and a "blit" (block image transfer) operation, specifically utilizing a "large" allocation or region of the Graphics Translation Table (GTT). The GTT is crucial for managing memory access between the CPU and the Intel integrated graphics processor. This identifier would typically be encountered in kernel source code, kernel logs, or when using kernel tracing tools to monitor graphics driver behavior, especially concerning large memory transfers or rendering operations.

This identifier is not a user-space command. Attempting to execute it directly in a shell will result in a "command not found" error. It's a kernel internal symbol or event name, primarily relevant for kernel developers, debuggers, or those analyzing graphics driver performance using tools like ftrace or perf.

The GTT is a memory management unit within Intel graphics hardware that translates graphics virtual addresses into physical memory addresses. It's analogous to a CPU's page tables but specialized for GPU memory access. "Large GTT" implies operations involving significant portions of this address space.

Blitting (Block Image Transfer) is a common graphics operation where a rectangular block of pixels from one memory location (source) is rapidly copied to another memory location (destination). It's a fundamental building block for rendering, used for moving textures, updating frame buffers, or composing images.

Kernel tracing tools like ftrace and perf allow developers to monitor the execution of kernel functions and events. Identifiers like "intel_upload_blit_large_gtt" can appear in trace logs, providing insights into how the i915 driver performs memory uploads and blit operations, especially when diagnosing performance issues or memory usage patterns.

The Intel graphics driver (i915) in the Linux kernel has undergone continuous development for decades, adapting to new Intel GPU architectures and optimizing performance. Functions and identifiers like "intel_upload_blit_large_gtt" reflect the evolution of efficient memory management techniques (like GTT usage) and rendering path optimizations (like blitting) that are crucial for modern graphics workloads. Such detailed internal symbols became more visible with advanced kernel tracing capabilities, allowing deeper insights into driver behavior.

i915 module: The primary Linux kernel module for Intel integrated graphics., perf(1): Linux profiling tool, can trace kernel functions/events., ftrace: Linux kernel tracing framework, can monitor specific kernel functions or tracepoints., debugfs: A virtual filesystem in Linux often used by drivers (like i915) to expose debug information.