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Reading /proc/filesystems for obtaining a list of file-systems supported by the running kernel is done frequently on Linux. Namely due to being read by the SELinux library (libselinux), reading of /proc/filesystems is done more often than one would typically expect and now the Linux 7.2 kernel is optimizing for it to yield much better performance…
Полный текст и контекст у первоисточника: https://www.phoronix.com/news/Linux-7.2-Reading-Proc-FS