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Summary: This release includes the new BFQ I/O scheduler which provides a much better interactive experience;


1. Prominent features

1.1. Preliminary Radeon Vega support

1.2. New BFQ I/O scheduler for a more reponsive desktop

BFQ (Budget Fair Queuing) is a new I/O scheduler. For personal systems, BFQ provides low latency for interactive applications, low latency for soft real-time applications, higher speed for code-development tasks, high throughput, and strong fairness, bandwidth and delay guarantees. For servers, besides the same benefits as above, BFQ guarantees: audio and video-streaming with zero or very low jitter and drop rate; fast retrieval of WEB pages and embedded objects; real-time recording of data in live-dumping applications (e.g., packet logging); responsiveness in local and remote access to a server. For more details and benchmarks, see the [ Documentation] or the [ project site]

Recommended LWN article: [ Two new block I/O schedulers for 4.12]

Code: [ commit], [ commit], [ commit], [ commit], [ commit], [ commit], [ commit], [ commit], [ commit], [ commit], [ commit] ,[ commit], [ commit], [ commit], [ commit]

1.3. New Kyber I/O scheduler

The Kyber I/O scheduler is a low-overhead scheduler suitable for multiqueue and other fast devices. Given target latencies for reads and synchronous writes, it will self-tune queue depths to achieve that goal, similary to blk-wbt.

Recommended LWN article: [ Two new block I/O schedulers for 4.12]

Code: [ commit], [ commit]

1.4. Progress in Live kernel patching

Live patching is a feature [ merged in Linux 4.0] that allows to patch the kernel code in running systems, which in turn allows to patch security issues without rebooting.

This release adds a so-called per-task consistency model - a foundation which will eventually enable to patch those ~10% of security patches which change function or data semantics. This is the biggest remaining piece needed to make livepatch more generally useful. This code stems from the [ design proposal] made in November 2014. It's a hybrid of kGraft and kpatch: it uses kGraft's per-task consistency and syscall barrier switching combined with kpatch's stack trace switching.

Recommended LWN article: [ Topics in live kernel patching]

Code: [ commit], [ commit], [ commit]

2. Core (various)

3. File systems

4. Memory management

5. Block layer

6. Tracing and perf tool

7. Virtualization

8. Cryptography

9. Security

10. Networking

11. Architectures

12. Drivers

12.1. Graphics

12.2. Storage

12.3. Drivers in the Staging area

12.4. Networking

12.5. Audio

12.6. Tablets, touch screens, keyboards, mouses

12.7. TV tuners, webcams, video capturers

12.8. Universal Serial Bus

12.9. Serial Peripheral Interface (SPI)

12.10. Serial

12.11. ACPI, EFI, cpufreq, thermal, Power Management

12.12. Real Time Clock (RTC)

12.13. Voltage, current regulators, power capping, power supply

12.14. Pin Controllers (pinctrl)

12.15. Multi Media Card (MMC)

12.16. Memory Technology Devices (MTD)

12.17. Industrial I/O (iio)

12.18. Multi Function Devices (MFD)

12.19. Pulse-Width Modulation (PWM)

12.20. Inter-Integrated Circuit (I2C)

12.21. Hardware monitoring (hwmon)

12.22. General Purpose I/O (gpio)

12.23. Leds

12.24. DMA engines

12.25. Cryptography hardware acceleration

12.26. PCI

12.27. Clock

12.28. Various

13. List of merges

14. Other news sites

KernelNewbies: Linux_4.12 (last edited 2017-07-16 16:33:38 by diegocalleja)