Loading feed…
Phoronix0 Hot0 comments4 min read
Two Very Exciting Memory Management Optimizations Going Into Linux 7.3
Linux 7.3's memory management pull request includes two notable performance optimizations. The first reduces locking contention in zsmalloc's zs_free(), which is used by Zswap and zRAM to release compressed RAM pages, improving throughput on systems under memory pressure such as Android devices and Zswap-heavy servers; benchmarks showed a Raspberry Pi 4B speeding up by up to 1.83x and a 20-core Intel system up to 1.4x. The second fixes a severe performance problem in rmap_walk_ksm() discovered by ZTE engineers, where applications could freeze for hundreds of milliseconds under memory pressure when many unrelated VMAs share a single anon_vma. The fix drops worst-case lock hold time from 705ms to a 1.67ms max (1.44ms average), a 100x to 500x reduction, benefiting workloads like JVM/Go garbage collection and database engines such as MySQL and PostgreSQL that fragment VMAs via mprotect or madvise.
Source: https://www.phoronix.com/news/Linux-7.3-MM. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.
