IONICE(1) IONICE(1) ionice - / ionice [-c ] [-n ] [-t] -p - ionice [-c ] [-n ] [-t] -P PGID ionice [-c ] [-n ] [-t] -u UID ionice [-c ] [-n ] [-t] [argument] ... / . -p ionice / . ionice . "best-effort". 4. : Idle / (idle) / . / . . ( 2.6.25). Best-effort / . 0-7 . " " (best-effort) (round-robin). (kernel) 2.6.26 / "none" / " ". " " nice : io_priority = (cpu_nice + 20) / 5. 2.6.26 CFQ / / . / ( 2.6.26). Realtime (RT) . . " " 8 . ( root). -c --class 0 none 1 realtime 2 best-effort 3 idle. -n --classdata . . " " 0-7 ( ) 0 . -p --pid -... . -P --pgid PGID... (PGIDs) . -t --ignore . . -u --uid UID... . -h --help . -V --version . / 2.6.13 / CFQ. o # ionice -c 3 -p 89 89 / . o # ionice -c 2 -n 0 bash 'bash' " " . o # ionice -p 89 91 (PID) 89 91. Jens Axboe , Karel Zak ioprio_set(2) . ionice util-linux . util-linux 2.42.1 2026-05-18 IONICE(1)