1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Linux 3.17 Lands Memfd, A KDBUS Prerequisite

Linux Kernel

Published on 19 August 2014 04:54 PM EDT
Written by Michael Larabel in Linux Kernel
16 Comments

There's many new features to Linux 3.17 that were covered over the past two weeks on Phoronix. One of the merged Linux 3.17 features that went under our radar at the time was the new memfd syscall was merged, which is a requirement of the forthcoming KDBUS, the kernel-based D-Bus implementation sought after by the systemd crew.

Memfd is a mechanism similar to Android's Ashmem that allows zero-copy message passing in KDBUS. Memfd effectively comes down to just a chunk of memory with a file descriptor attached that can be passed to mmap(). The memfd_create() function returns a raw shmem file and there's optional support for sealing.

Memfd is needed by KDBUS for message passing and now the code -- after being public but out-of-tree for several months -- is finally mainline. As a result, the KDBUS code has been updated to take advantage of the mainline Linux 3.17 state.

While KDBUS wasn't merged for Linux 3.17, it seems to be getting closer to being in shape for merging. At the start of the year the developers expressed a goal of mainlining KDBUS in 2014 and now their next opportunity would be Linux 3.18 otherwise Linux 3.19 would be cutting it close to the end of the year.

Those wishing to checkout the latest KDBUS code can find it via Greg KH's GitHub.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  2. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  3. AMD Radeon R9 285 Tonga Performance On Linux
  4. Apotop Wi-Copy
Latest Linux Articles
  1. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
  2. MSI: Update Your BIOS From The Linux Desktop
  3. NVIDIA vs. AMD 2D Linux Drivers: Catalyst Is Getting Quite Good At 2D
  4. 15-Way GPU Comparison With Mesa 10.3 + Linux 3.17
Latest Linux News
  1. Linux 3.18-rc1 Released One Week Early With Many Changes
  2. The VC4 Gallium3D Driver Is Still Moving Along For The Raspberry Pi
  3. Direct3D 9 Support Might Land Within Mainline Mesa 3D Drivers
  4. OpenGL Preview Benchmarks For NVIDIA's GeForce GTX 970
  5. HOPE: The Ease Of Python With The Speed Of C++
  6. Vitesse: Using LLVM To Speed Up Databases
  7. AMD Is Restructuring Again, Losing 7% Of Employees
  8. Linux Testing Of The NVIDIA GeForce GTX 970
  9. Qt 5.4 Now In Beta With Web, Bluetooth LE, Graphics Improvements
  10. AMD's Radeon R9 285 On Linux Offers Good OpenCL Performance
Latest Forum Discussions
  1. NVIDIA Presents Its Driver Plans To Support Mir/Wayland & KMS On Linux
  2. AMD Is Restructuring Again, Losing 7% Of Employees
  3. Bye bye BSD, Hello Linux: A Sys Admin's Story
  4. Open-Source AMD Fusion E-350 Support Takes A Dive
  5. Upgrade to Kaveri, very slow VDPAU performance
  6. ChromeOS Drops Support For EXT2/EXT3/EXT4 File-Systems
  7. Lennart Poettering On The Open-Source Community: A Sick Place To Be In
  8. The Slides Announcing The New "AMDGPU" Kernel Driver