this post was submitted on 02 Dec 2025
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Important Performance Work: Overhaul Of RSEQ & CID Management Merged For Linux 6.19 (www.phoronix.com)
submitted 2 weeks ago by cm0002@mander.xyz to c/linux@programming.dev
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An important set of patches were just merged a few minutes ago to Linux Git for the ongoing Linux 6.19 kernel with some important performance implications.

Intel Fellow Thomas Gleixner yesterday sent in the "core/rseq" pull request for Linux 6.19 Git that was then merged today by Linus Torvalds. This pull includes the patches rewriting the memory-mapped concurrency ID "MM CID" code within the kernel that was found to provide up to a ~14%+ performance improvement for PostgreSQL database throughput. As well, my own testing of this MM CID rewrite also showed very positive gains -- on AMD EPYC hardware used for testing. My tests of those patches were covered in Intel's Rewrite Of Linux MM CID Code Showing Some Nice Gains For AMD.

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