Sysctl With Linux 6.7 Continues Work To Remove Kernel Bloat

Written by Michael Larabel in Linux Kernel on 1 November 2023 at 04:20 PM EDT. 2 Comments
Since Linux 6.6 we've been seeing work upstreamed for sysctl working to remove its sentinel, the final empty element on each sysctl array. This will cut-down on around 64 bytes of bloat per array, help with kernel build times, and an all-around improvement. With Linux 6.7 more of the sysctl changes are ready and hopefully for the v6.8 kernel cycle next year the effort will be completed.

Linux 6.6 brought infrastructure changes for the sysctl sentinel removal effort. Now for Linux 6.7 all of the arch/ and drivers/ code has been modified to remove the sentinel. Then for the v6.8 kernel cycle the hope is to remove the rest of the sentinels and removing of the last sentinel check in the code.

sysctl sentinel removal

Once completed this should pay off with the build time of the kernel, dropping around ~64 bytes per array, and an overall improvement for the kernel sysctl code.

Today's pull request of these sysctl changes to remove the superfluous sentinels is just a few dozen lines of code removed and has been vetted already in linux-next for the past few weeks.
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