[gentoo-user] problems granting realtime sched perms

Hi,

to use jack I want to grant the user (me) the permission to
start tasks with realtime priority.

For that I set /etc/security/limits.conf to (commented lines removed)
*               hard    rtprio          0
*               soft    rtprio          0
@realtime	-	rtprio	99
@realtime	-	memlock	unlimited

I am in the group 'ealtime'. I rebooted after the changed
mentioned above.

I am using Linux kernel 3.2.4 (vanilla). I read, that
scheduling groups could create problems, so the kernel is
conifgure as:

#
# CONFIG_SCHED_AUTOGROUP is not set
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_SCHED_OMIT_FRAME_POINTER=y

# CONFIG_SCHED_SMT is not set
# CONFIG_SCHED_MC is not set
# CONFIG_IRQ_TIME_ACCOUNTING is not set
# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
CONFIG_PREEMPT=y
CONFIG_PREEMPT_COUNT=y
CONFIG_SCHED_HRTICK=y

The security model of the kernel is set to:

#
# Security options
#
# CONFIG_KEYS is not set
# CONFIG_SECURITY_DMESG_RESTRICT is not set
CONFIG_SECURITY=y
# CONFIG_SECURITYFS is not set
# CONFIG_SECURITY_NETWORK is not set
# CONFIG_SECURITY_PATH is not set
# CONFIG_SECURITY_TOMOYO is not set
# CONFIG_SECURITY_APPARMOR is not set
# CONFIG_IMA is not set
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_DEFAULT_SECURITY=""
CONFIG_CRYPTO=y



As root there is no problem in executing
ionice -c 1 ls

As user instead I see with the same command:
ionice: ioprio_set failed: Operation not permitted
[1]    3070 exit 1     ionice -c 1 ls


How can I grant myself realtime scheduling permissions successfully?

Best regards,
mcc