Linux 7.0 Scheduler Updates Land Time Slice Extension, Performance & Scalability Work
([Linux Kernel] 33 Minutes Ago
Linux 7.0 Scheduler)
- Reference: 0001612682
- News link: https://www.phoronix.com/news/Linux-7.0-Scheduler
- Source link:
Merged today for the [1]Linux 7.0 kernel are some pretty exciting scheduler changes: new features and never-ending work around scheduler performance optimizations and greater scalability with today's increasingly high core count systems.
Among the scheduler changes that were successfully merged today by Linus Torvalds includes [2]the time slice extension support that has been in development for about a decade ! There is a time slice extension for the kernel implemented via Restartable Sequences (RSEQ) that had undergone several different attempts over the years. The merged code lets user-space processes request a temporary, opportunistic extension of their CPU time slice without being preempted. The intent here is when a thread enters a critical section to avoid contention on a resource when the thread is scheduled outside of the critical section.
Also making it into Linux 7.0 is [3]just focusing on full and lazy preemption modes for modern CPU architectures . Affected architectures now limited to either full or lazy preemption modes include x86/x86_64, s390, RISC-V, POWER, LoongArch, and ARM64 in getting rid of the none and voluntary options.
Linux 7.0 also brings a number of scheduler performance and scalability improvements. There is work that helps scalability across various workloads, fair scheduler SMP NOHZ balancing code speed-ups, and other improvements.
The list of all the exciting scheduler feature updates now-merged for Linux 7.0 can be found via [4]this Git merge . Once the merge window settles down I'll begin with my Linux 7.0 kernel performance benchmarking and on the lookout for any regressions.
[1] https://www.phoronix.com/search/Linux+7.0
[2] https://www.phoronix.com/news/Linux-TIP-Time-Slice-Extension
[3] https://www.phoronix.com/news/Linux-Restrict-Preempt-Modes
[4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=36ae1c45b2cede43ab2fc679b450060bbf119f1b
Among the scheduler changes that were successfully merged today by Linus Torvalds includes [2]the time slice extension support that has been in development for about a decade ! There is a time slice extension for the kernel implemented via Restartable Sequences (RSEQ) that had undergone several different attempts over the years. The merged code lets user-space processes request a temporary, opportunistic extension of their CPU time slice without being preempted. The intent here is when a thread enters a critical section to avoid contention on a resource when the thread is scheduled outside of the critical section.
Also making it into Linux 7.0 is [3]just focusing on full and lazy preemption modes for modern CPU architectures . Affected architectures now limited to either full or lazy preemption modes include x86/x86_64, s390, RISC-V, POWER, LoongArch, and ARM64 in getting rid of the none and voluntary options.
Linux 7.0 also brings a number of scheduler performance and scalability improvements. There is work that helps scalability across various workloads, fair scheduler SMP NOHZ balancing code speed-ups, and other improvements.
The list of all the exciting scheduler feature updates now-merged for Linux 7.0 can be found via [4]this Git merge . Once the merge window settles down I'll begin with my Linux 7.0 kernel performance benchmarking and on the lookout for any regressions.
[1] https://www.phoronix.com/search/Linux+7.0
[2] https://www.phoronix.com/news/Linux-TIP-Time-Slice-Extension
[3] https://www.phoronix.com/news/Linux-Restrict-Preempt-Modes
[4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=36ae1c45b2cede43ab2fc679b450060bbf119f1b