Sharing Linux kernel-related cutting-edge technology, technical articles, technical news, and curated tutorials
UprobeStats, introduced in Android 15, uses the Linux kernel eBPF uprobe mechanism to dynamically insert probes into user‑space methods, capture timestamps and arguments, load BPF programs, and forward the data to StatsD via configurable protobufs, enabling flexible, source‑free instrumentation with minimal overhead.
The Android DisplayManagerService (DMS) orchestrates detection, addition, configuration, and removal of physical and logical displays, handling multi‑user, virtual, split‑screen, foldable, and HDR scenarios through components such as DisplayDeviceRepository, LogicalDisplayMapper, adapters, and power controllers, all initialized by SystemServer.
The article offers a thorough overview of audio technology fundamentals, tracing the evolution of audio effects and major brands, explaining sound physics and acoustic phenomena, detailing speaker and microphone types—including MEMS and multi‑mic systems—and covering power amplifiers, codec chips, and both subjective and objective methods for evaluating audio quality.
H.266/VVC, the next‑generation video coding standard finalized in 2020, delivers roughly 50 % bitrate savings over H.265/HEVC with modestly higher decoding complexity, introduces advanced intra‑ and inter‑prediction, transform, quantization, entropy and loop‑filtering tools, and faces patent‑pool and adoption challenges before widespread smartphone integration around 2026.
This guide walks developers with C and assembly experience through building a simple bare‑metal operating system that runs directly on ARM64 hardware without any existing OS or bootloader, offering a hands‑on introduction to low‑level system concepts for students, embedded engineers, and computer‑system enthusiasts.
The article explains WebRTC audio‑video synchronization by detailing the ITU‑R BT.1359‑1 standard, describing a synchronizer that computes target delays from desired and packet‑pair delays, applying bounded adjustments via sliding‑average filtering, and outlining a hardware method for measuring resulting latency.
This article explains the structure and generation of RTP timestamps for audio and video, the role of NTP timestamps as a common time base, how RTP and NTP are correlated through Sender Reports and linear regression, and the calculations used to achieve accurate audio‑video synchronization and target delay management in WebRTC.
The 19th China Linux Kernel Developers Conference in Wuhan on October 26, 2024 attracted over 80,000 online viewers and nearly 400 developers, showcased five technical sub‑forums—from memory and storage I/O to virtualization and scheduling—featured AI‑focused kernel talks, announced a new open‑source innovation institute, and made all materials publicly available on GitHub.
Android Dynamic Performance Framework (ADPF) lets apps and games send performance‑hint data—such as target work durations and preferred cores—to the kernel, enabling faster CPU frequency scaling and priority scheduling that mitigates the latency of PELT/WALT and DCVS, while developers use APIs like createHintSession and reportActualWorkDuration, though adoption remains limited.
The 19th China Linux Kernel Developers Conference (CLK 2024) in Wuhan on October 26 invites paper submissions from September 10‑25 on topics such as RISC‑V, ARM64, scheduling, memory, storage, networking, containers, AI, automotive and embedded Linux kernel optimization, with abstracts limited to 500 words and results announced September 30.
