Bug 44371

Summary:	can't use realtime I/O priority
Product:	IO/Storage	Reporter:	wbrana
Component:	Block Layer	Assignee:	Jens Axboe (axboe)
Status:	RESOLVED INVALID
Severity:	high	CC:	alan
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.4.4	Subsystem:
Regression:	No	Bisected commit-id:

Description wbrana 2012-07-09 17:06:51 UTC

localhost ~ # ulimit -e unlimited
localhost ~ # ulimit -r unlimited

localhost ~ # su - x

x@localhost ~ $ ionice -c1 ls
ionice: ioprio_set failed: Operation not permitted

x@localhost ~ $ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) unlimited
file size               (blocks, -f) unlimited
pending signals                 (-i) 31607
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) 3670016
open files                      (-n) 65536
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) unlimited
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 31607
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

Comment 1 Alan 2012-07-10 15:54:56 UTC

CAP_SYS_ADMIN is required to set rt classes