Linux 6.10 To Account For NUMA Node When Allocating Per-CPU Cpumasks

Written by Michael Larabel in Linux Kernel on 13 April 2024 at 09:30 AM EDT. 5 Comments
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.

Queued into TIP.git's x86/cpu branch this week is a change to take the NUMA node into account when allocating per-CPU cpumasks.

With most per-CPU cpumasks being accessed from their own local processor cores, it makes sense for them to be allocated local to the given NUMA node.

AMD EPYC server

The patch does acknowledge the intent to improve performance for the per-CPU cpumasks but without any indication of any observed performance benefits. The upstream mailing list thread isn't resolving for any additional insight, but in any event this change just touches a dozen lines of code and is now queued via x86/cpu for introduction in the Linux 6.10 merge window that will kick off in May.
Related News
About The Author
Michael Larabel

Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

Popular News This Week