GPU L2 observer source attribution, 2026-11-04

Repository: accel-sim/gpgpu-sim_distribution
Pull request: https://github.com/accel-sim/gpgpu-sim_distribution/pull/151
Pinned source commit: 2beb8a461c50918caa2475b9c2075a1a73ec8934

Source files:
https://github.com/accel-sim/gpgpu-sim_distribution/blob/2beb8a461c50918caa2475b9c2075a1a73ec8934/src/gpgpu-sim/gpu-cache.cc
https://github.com/accel-sim/gpgpu-sim_distribution/blob/2beb8a461c50918caa2475b9c2075a1a73ec8934/src/gpgpu-sim/l2-cache-observer.h
https://github.com/accel-sim/gpgpu-sim_distribution/blob/2beb8a461c50918caa2475b9c2075a1a73ec8934/doc/l2-cache-observer.md

The website's HTML event-flow illustration was independently authored from
the source's event semantics. The cache access path appears at lines 2006-2040
of the pinned gpu-cache.cc. Accepted L2 accesses update native statistics,
construct an event using the same selected statistics status, and notify the
registered callback.

gpu-cache-BSD-3-Clause.txt preserves the complete copyright and license header
of gpu-cache.cc. COPYRIGHT.txt preserves the repository's root notice.
l2-cache-observer.h declares SPDX-License-Identifier: BSD-3-Clause.

The displayed notify method is reproduced from l2-cache-observer.h,
lines 55-57 of the pinned commit. Line breaks were adjusted for the website;
the code is otherwise unchanged.