Linux 5.3 Lands Support For Tracking AVX-512 Usage
Written by Michael Larabel in Linux Kernel on 9 July 2019 at 05:46 AM EDT. 4 Comments
LINUX KERNEL --
After being delayed from earlier kernel cycles, Linux 5.3 will allow for tracking the last time a process made use of AVX-512 in order for user-space schedulers to provide better task placement.

Going through several rounds of review over the past several months for better tracking of AVX-512 usage by user-space Linux programs, the support has now landed by means of the "x86/core" updates for Linux 5.3. This addition exposes an "AVX512_elapsed_ms" metric via "/proc/[pid]/arch_status" for exposing the last time a particular process made use of any AVX-512 instructions.

With current processors supporting AVX-512 generally leading to lower frequencies when running such instructions, this addition can allow for user-space task schedulers to place AVX-512 heavy tasks to particular core(s) and non-AVX-512 programs to the cores that should be operating at higher clock frequencies barring any thermal throttling or other issues.

This arch_status interface in the file could also be used for exposing other information beyond just the last time of AVX-512 usage.

So with this now honored pull request, the support is in order for Linux 5.3 should any user-space programs be interested in this information (primarily in the HPC space) for offering better task scheduling to particular cores.

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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.

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