/proc/pid/arch_status Is Coming To Show Architecture-Specific Details Of A Given Task
Written by Michael Larabel in Linux Kernel on 14 June 2019 at 06:36 AM EDT. 24 Comments
LINUX KERNEL --
To be exposed via /proc/[pid]/arch_status is a new interface for exposing architectural-specific information for a given Linux process.

When CONFIG_PROC_PID_ARCH_STATUS is enabled, there will be this new arch_status file to expose any extra architecture specific information for a given task. At this point, it's just exposing the elapsed time since last using AVX-512.

This is the evolution of the work talked about earlier this year for the Linux kernel better tracking AVX-512 usage in order to provide for more optimal task placement. That AVX-512 tracking code was merged back for Linux 5.1 while at the time it was going to be exposed to user-space via a status file, which didn't land initially and is now being exposed via this new arch_status concept.

This can provide guidance to a user/administrator (or more than likely, a script) whether a process ever used AVX-512 instructions and/or approximately the last time done so, such as if wanting to pin AVX-512 using (or not) processes to the same core(s).

The addition of the infrastructure and wiring in the AVX-512 reporting is in the x86/core tree ahead of next month's Linux 5.3 merge window.
About The Author
Author picture

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 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 OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

Related Linux Kernel News
Popular News This Week