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A framework for code tagging [LWN.net]

Kernel code can, at times, be quite inward looking; it often refers to
itself. To enable this introspection, the kernel has evolved several
mechanisms for identifying specific locations in the code and carrying out
actions related to those locations. The code-tagging
framework patch set, posted by Suren Baghdasaryan and Kent Overstreet,
is an attempt to replace various ad hoc implementations with a
single framework, and to add some new applications as well.
....

El Salvador , Kent Overstreet , Suren Baghdasaryan , Mel Gorman , Peter Zijlstra , Jonathan Corbet , Michal Hocko , Oscar Salvador ,

Linux Kernel Drama: AMD's Spectral Chicken

There's a bit of Linux kernel code for AMD Zen 2 processors called the 'spectral chicken' and a call for cleaning up that code, which was originally written by an Intel Linux engineer, has been rejected. ....

Borislav Petkov , Thomas Gleixner , Peter Zijlstra , System Research Center , Intel Linux , Inux Hardware Reviews , Inux Hardware Benchmarks , Inux Server Benchmarks , Inux Benchmarking , Esktop Linux , Inux Performance , Pen Source Graphics , Inux How To , Buntu Benchmarks , Buntu Hardware , Horonix Test Suite ,

The shrinking role of semaphores [LWN.net]

The kernel s handling of concurrency has changed a lot over the years. In
2023, a kernel developer s toolkit includes tools like completions, highly
optimized mutexes, and a variety of lockless
algorithms. But, once upon a time, concurrency control came down to
the use of simple semaphores; a discussion on a small change to the
semaphore API shows just how much the role of semaphores has changed over
the course of the kernel s history.
....

Luis Chamberlain , Sergey Senozhatsky , Linus Torvalds , Edsger Dijkstra , Ingo Molnar , Jonathan Corbet , Peter Zijlstra ,

EEVDF Scheduler Patches Updated For The Linux Kernel

Intel Linux engineer Peter Zijlstra has sent out updated patches on the kernel patch series he's been working on the past several months around the 'EEVDF' CPU scheduler for improving upon the current CFS scheduler code. ....

Peter Zijlstra , Intel Linux , Earliest Eligible Virtual Deadline First , Inux Hardware Reviews , Inux Hardware Benchmarks , Inux Server Benchmarks , Inux Benchmarking , Esktop Linux , Inux Performance , Pen Source Graphics , Inux How To , Buntu Benchmarks , Buntu Hardware , Horonix Test Suite ,

An EEVDF CPU scheduler for Linux [LWN.net]

The kernel s completely fair scheduler
(CFS) has the job of managing the allocation of CPU time for most of
the processes running on most Linux systems. CFS was merged for the 2.6.23
release in 2007 and has, with numerous ongoing tweaks, handled the job
reasonably well ever since. CFS is not perfect, though, and there are some
situations it does not handle as well as it should. The EEVDF
scheduler, posted by Peter Zijlstra, offers the possibility of
improving on CFS while reducing its dependence on often-fragile heuristics.
....

Jonathan Corbet , Ion Stoica , Hussein Abdel Wahab , Peter Zijlstra , Eligible Virtual Deadline , Earliest Deadline First ,