Linux Kernel News Archives

John Ogness of Linutronix today sent out the second iteration of his patches working on threaded printing support for printk() and related rework of that code that is a necessary step before the real-time (RT) kernel patches can be finally mainlined.

With the in-development Linux 6.10 kernel Eric Biggers of Google landed new AES-XTS implementations for much faster performance for Intel/AMD processors via new AES-NI + AVX, VAES + AVX2, VAES + AVX10/256, and VAES + AVX10/512 code paths. Biggers has since begun tackling even better AES-GCM encryption/decryption performance by leveraging a new code path to utilize AVX-512/AVX10 and/or VAES.

Linus Torvalds just released Linux 6.10-rc2 with a busy week's worth of fixes.

Now past the Linux 6.10 merge window, this week brought an initial batch of drm-misc-next changes submitted to the Direct Rendering Manager subsystem's DRM-Next for queuing until the Linux 6.11 merge window opens up in July. The changes this week include a notable addition for the open-source NVIDIA (Nouveau) driver and some improvements for the Intel iVPU driver for their Neural Processing Unit (NPU).

Ahead of today's Linux 6.10-rc2 kerne weekly test release a few "x86/urgent" patches were submitted for addressing some fallout on Intel and AMD processors.

The Linux 6.10-rc1 kernel was just released to top off the Linux 6.10 merge window.

With the memory management "MM" updates merged for the Linux 6.10 there is now NUMA balancing support for multi-size transparent hugepages (THPs). This is yielding some nice performance results and there is also other work in this new kernel around multi-size THPs.

Andrew Morton sent out more patches on Wednesday that have been pulled into the Linux 6.10 kernel. Notable from this latest round of "non-MM" updates is enabling more compiler warnings by default and getting newer AMD GPUs working on the RISC-V architecture.

Greg Kroah-Hartman today sent in the char/misc updates for Linux 6.10 alongside the other areas of the kernel he oversees. Among the char/misc changes is adding the NTSYNC driver that exposes the /dev/ntsync character device for use by the likes of Wine and Valve's Steam Play (Proton). But for Linux 6.10 the driver is effectively "broken" as most of the feature patches have yet to be included.

Introduced last year with the Linux 6.7 kernel was a hardening configuration to allow for "make hardening.config" as an easy way of building a security-hardened Linux kernel with sane defaults. With Linux 6.10 there are some additional security minded features now enabled.

As a small information heads up, the Linux 6.10 kernel will print the number of populated memory slots at boot time to the kernel log as a little helper.

Alongside all of the other pull requests by Ingo Molnar submitted at the start of the week during the opening of the Linux 6.10 merge window were the scheduler updates. As usual, the kernel scheduler work continues to see various tweaks and refinements to enhance its behavior.

While machine check exception (MCE) events tend to be uncommon, a change made by Intel engineers is accommodating the ability in the Linux kernel to store more machine check records for "when things go seriously wrong" on increasingly high core count servers.

The year-long effort to removal the sysctl sentinel for clearing bloat from the kernel and allowing faster build times should be crossing the finish line in Linux 6.10.

Besides Linus Torvalds examining various elements of code he's merging and build testing it on his AMD Ryzen Threadripper workstation and now also testing more on ARM64 with Ampere Altra, he does these days still believe in "dogfooding" and is in fact running the leading-edge Linux kernel code even during the merge window.

The big batch of Direct Rendering Manager (DRM) kernel graphics/display driver updates for the Linux 6.10 merge window were sent out today that includes the new "Panthor" driver for newer ARM Mali/Immortalis graphics processors and the usual hearty assortment of Intel and AMD graphics driver changes.

Linux kernel and Git creator Linus Torvalds is known for his current use of an AMD Ryzen Threadripper workstation as his main system after years of using Intel hardware. The past few years he's also been doing more ARM64 testing now that he has an Apple MacBook using Apple Silicon that serves as a nice travel device and for routinely compiling new ARM64 Linux kernel builds. More recently, his ARM64 Linux testing has increased now that he has a more powerful AArch64 system to complement his collection of routine gear.

The work written about one month ago on Phoronix for much faster AES-XTS on modern Intel/AMD CPUs for speeding up disk and file encryption by as much as 155% with AMD Zen 4 CPUs has been submitted for Linux 6.10! As expected, this work providing new AES-XTS implementations for modern x86_64 processors is going into Linux 6.10 as part of the crypto subsystem updates.

Today marks the first official day of the Linux 6.10 merge window. Among the horde of pull requests sent out today were the numerous x86 pull requests of material that's been queuing up in TIP.git of which there are many changes benefiting both Intel and AMD.

Linux 6.9 is out! Linux 6.9 has been released on time as the newest stable kernel version for rolling-release Linux distributions and other summer releases/updates. Linux 6.9 has a number of exciting features and improvements for those habitually updating to the newest version.

Barring any last minute reservations by Linus Torvalds, Linux 6.9 stable should release later today. In turn the Linux 6.10 merge window will then open for the next two weeks and already some early pull requests have been submitted for this next kernel version. Here is a look at some of what to expect with the Linux 6.10 kernel.

For those interested in some insightful Linux kernel mailing list reading this weekend, there's been a vibrant discussion on the ability for the Linux kernel to mitigate unexpected arithmetic overflows/underflows/wraparounds.

Barring any last minute reservations by Linus Torvalds, the Linux 6.9 kernel should be released as stable on Sunday. It's been a fairly quiet week so Linux 6.9 stable will likely happen as opposed to going through an extra week with a 6.9-rc8 candidate. With this spring 2024 kernel there are many great features and improvements, especially for modern Intel and AMD platforms.

If all goes well the Linux 6.9 stable kernel will be released on Sunday and in turn mark the opening of the Linux 6.10 merge window. In hoping for an on-time release, some Linux kernel subsystem maintainers have been already submitting early pull requests of their feature material for v6.10. Among those early pulls are the SLAB (SLUB) updates.

Over the past year there's been much work happening within the Linux kernel's sysctl code for clearing up ~64 bytes of bloat per array throughout the kernel by dropping the last sysctl "sentinel" entry at the end of each array. This also helps in reducing the build time of the kernel and is a nice improvement. With Linux 6.10, the sysctl sentinel clearing throughout different subsystems is set to happen.

Linus Torvalds just released Linux 6.9-rc7 and it's looking good like the Linux 6.9 stable kernel will hopefully be out next Sunday.

Sent in to DRM-Next as part of last week's drm-misc-next changes is implementing support for tracking cleared free memory and is initially wired up for the AMDGPU kernel graphics driver.

Linus Torvalds just released Linux 6.9-rc6 as the latest weekly test release of Linux 6.9 as it works toward its stable release by mid-May.

The fifth weekly release candidate of Linux 6.9 is now available as the kernel cycle looks to get wrapped up by mid-May.

Ahead of the Linux 6.9-rc5 test kernel being released later today, this week's batch of "x86/urgent" fixes were sent out this morning.

While systemd 255 last year introduced a "blue screen of death" inspired solution with systemd-bsod for presenting logged error messages full-screen, it's not appropriate for all errors. Systemd-bsod can work out for presenting full-screen messages in case of boot failures and other problems where user-space is alive. But the user-space code does little good in case of a kernel panic and similar issues bringing the system to a halt. Set to be introduced now with Linux 6.10 is a parallel "blue screen of death" like error presenting experience with the introduction of the DRM panic handler.

Within yesterday's Linux 6.9-rc4 release is an interesting little nugget by Linus Torvalds to battle Kconfig parsers that can't correctly handle tabs but rather just assume spaces for whitespace for this kernel configuration format.

As expected the Linux 6.9-rc4 test kernel is out today as Linux 6.9 works its way toward release by mid-May.

In addition to a SLUB optimization for extreme scenarios, faster AES-XTS disk/file encryption for modern Intel/AMD CPUs, and other performance optimizations on the way for Linux 6.10, another minor one was queued up this week.

A patch to the Linux kernel's SLUB allocator has been queued ahead of the upcoming Linux 6.10 merge window to help reduce memory consumption in extreme scenarios.

Due to yesterday's Native BHI vulnerability disclosure affecting all Intel processors with this variant of Branch History Injection (BHI) not requiring BPF to exploit, a slew of new Linux kernel stable releases are out today to back-port this security mitigation.

For those making use of AES-XTS crypto for the likes of disk and file encryption on x86_64 CPUs, the upcoming Linux 6.10 kernel cycle is bringing some very tantalizing improvements especially if you are running recent AMD and Intel processors. With AMD Zen 4 processors the benefits can be as much as 155% faster while even Intel Ice Lake and Sapphire Rapids server processors can enjoy 127~151% faster AES-XTS-256.

Linux 6.9-rc3 is released and most notable are the Bcachefs fixes to which Torvalds quipped, "if you had a corrupted bcachefs filesystem you'd probably want this, and if you thought bcachefs was stable already, I have a bridge to sell you. Special deal only for you, real cheap." Plus various other fixes throughout.

Veteran Linux kernel developer Peter Zijlstra is working to wrap-up feature work around the EEVDF kernel scheduler code.

Following the recent upgrade to Rust 1.77, the Linux kernel Rust code is preparing to move to Rust 1.78 that will be released as stable in about one month.

A patch queued in TIP.git's "x86/cpu" branch for collecting ahead of the Linux 6.10 kernel cycle adds support for handling the AMD 0x80000026 leaf to correct CPU topology information reporting for some newer AMD processors.

Adding to the Linux 6.9 features one of the changes that went under my radar is that the s390 kernel builds can now be carried out using the full LLVM compiler stack.

Linus Torvalds just released Linux 6.9-rc2 as the newest test release of Linux 6.9 that will be out as stable in mid-May.

Back in Linux 6.6 the Shadow Stack support was finally merged as part of Intel's Control-flow Enforcement Technology (CET). This years-in-the-making effort allows for better defending against ROP attacks for newer generations of Intel processors. For Linux 6.10, Shadow Stack support is being extended to x32.

Linus Torvalds just released the first release candidate for Linux 6.9 that now marks the formal end of the two-week merge window.

Linux 6.8 dropped the SLAB allocator after its deprecation in v6.5 and now just leaving SLUB for all allocation duties. For Linux 6.9 there is continued cleaning from that SLAB removal as well as making more SLUB improvements.

Workqueues are commonly used within the Linux kernel for asynchronous process execution contexts. With Linux 6.9 the workqueue (WQ) code has seen "significant and invasive" changes.

So far when it comes to Direct Rendering Manager (DRM) / Kernel Mode-Setting (KMS) display drivers for Linux, there are Rust efforts underway for the Apple Silicon kernel graphics driver with the Asahi Linux project as well as the new Nova effort for a modern open-source NVIDIA kernel driver from Red Hat. Also now out from Red Hat is posting the Rust bindings for KMS to review plus porting the existing Virtual KMS driver over to Rust as the "RVKMS" driver.

Loongson continues enabling more kernel functionality for their LoongArch processor port for the upstream Linux kernel. With Linux 6.9 they sent out today a set of patches enabling more features for this Chinese CPU architecture.

With the frame-buffer device "FBDEV" subsystem changes sent out today for the Linux 6.9 kernel, there is support for larger console fonts to better handle today's ~4K displays.