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Kernel and Graphics: Linux Plumbers Conference and More

Submitted by Roy Schestowitz on Tuesday 27th of July 2021 04:25:56 PM Filed under
Graphics/Benchmarks
Linux

        

  • Analyze the Linux kernel with ftrace | Opensource.com

    An operating system's kernel is one of the most elusive pieces of software out there. It's always there running in the background from the time your system gets turned on. Every user achieves their computing work with the help of the kernel, yet they never interact with it directly. The interaction with the kernel occurs by making system calls or having those calls made on behalf of the user by various libraries or applications that they use daily.

    I've covered how to trace system calls in an earlier article using strace. However, with strace, your visibility is limited. It allows you to view the system calls invoked with specific parameters and, after the work gets done, see the return value or status indicating whether they passed or failed. But you had no idea what happened inside the kernel during this time. Besides just serving system calls, there's a lot of other activity happening inside the kernel that you're oblivious to.

  • Google Continues Working On Suspend-Only Swap Spaces For Linux - Phoronix

    Google engineers and other parties are interested in being able to create swap spaces on Linux systems that would be reserved just for system suspend/hibernation purposes and not for generic swapping to disk. 

    The proposed SWAP_FLAG_HIBERNATE_ONLY would reserve a swap space just for suspend-to-disk usage and not swapping regular pages. To now, generic swap ultimately needs to be enabled if just wanting to use it for system suspend, short of workarounds for turning it on/off around the suspend process. 

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  • Linux Plumbers Conference: RISC-V Microconference Accepted into 2021 Linux Plumbers Conference

    We are pleased to announce that the RISC-V Microconference has been accepted into the 2021 Linux Plumbers Conference. The RISC-V software eco-system is gaining momentum at breakneck speed with three new Linux development platforms available this year. The new platforms bring new issues to deal with.

  • DMA-Fence Deadline Awareness Proposed To Help Ensure GPU Drivers Render On-Time - Phoronix

    There is the phenomenon on Linux where when double-buffered rendering and missing vblanks can lead to the GPU running at a lower frequency when instead the opposite should happen so it will try to not miss vblanks in the first place. In the past there's been talks of "boost" support in the GPU drivers or also workarounds from user-space like dynamic triple buffering, but sent out this week is a new proposal around DMA-Fence deadline awareness as another means of addressing this problem.

    DMA-Fence deadline awareness is about being able to set a desired deadline on a fence for when the waiter would like to see the fence signaled. With the use-case being pursued, the deadline would be set as the next vblank time. Over earlier approaches this deadline awareness method should work out better in the context of atomic helpers and where the display and GPU drivers are different.

  • H.264 SVC / Temporal Encoding Wired Up For AMD's Linux Graphics Driver - Phoronix

    For those making use of Radeon GPUs for H.264 encoding on Linux, the open-source Mesa driver stack for VCN hardware has just merged support for handling H.264 Scalable Video Coding (SVC) / temporal encoding.

    This merge request from AMD was just merged into Mesa 21.3-devel for expanding its H.264 encode capabilities with Video Core Next.

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