Linux's Preempt Lazy Support Coming To POWER CPUs

[phoronix]

Phoronix: Linux's Preempt Lazy Support Coming To POWER CPUs

Linux 6.13 is introducing a new Lazy Preemption mode with the "PREEMPT_LAZY" option. The lazy preemption mode is similar to full preemption but is less eager to preempt normal (SCHED_NORMAL) tasks. The goal is on reducing lock holder preemption and obtaining some of the performance gains found under the voluntary preemption mode. For Linux 6.13 the lazy preemption mode was exposed for x86/x86_64, RISC-V, and later added for LoongArch. Likely with the upcoming Linux 6.14, lazy preempt should work on POWER platforms...

https://www.phoronix.com/news/Linux-6.14-Preempt-Lazy-POWER

[ayumu]

RISC-V got this feature before POWER did. This shows the trend where RISC-V is now more relevant than POWER.

Also from Debian, per-architecture built packages in sid:

https://buildd.debian.org/stats/graph-week-big.png

As you can see, RISC-V is about to pass POWER in number of Debian Sid packages available for the architecture.

By the way, passing ARM is the next step.

[ernsteiswuerfel]

ayumu Too bad winning a popularity contest does not get you any CPU performance win...

[ayumu]

ayumu Too bad winning a popularity contest does not get you any CPU performance win...

You seem extremely confused. This is about ISAs, not CPUs.