Messages in this thread | | | Date | Tue, 13 Jan 2009 10:31:05 -0800 | From | Mark Glines <> | Subject | 2.6.28 has unconfigurable group sched? |
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Hi,
I've got an issue on x86-64 where I can't configure the system to allow RT tasks for a non-root user.
In 2.6.26.5, I was able to do the following to set things up nicely: echo 450000 >/sys/kernel/uids/0/cpu_rt_runtime echo 450000 >/sys/kernel/uids/1000/cpu_rt_runtime
I've searched lkml archives and am unable to figure out what changed. As far as I can tell, the documentation (sched-rt-group.txt) says this should work, and indeed, it did work with 2.6.26.
Seems like every value I try to echo into the /sys files returns EINVAL. Even when I'm just writing the same value it already had:
chirp uids # pwd /sys/kernel/uids chirp uids # cat 0/cpu_rt_period 1000000 chirp uids # cat 0/cpu_rt_runtime 950000 chirp uids # cat 1000/cpu_rt_period 1000000 chirp uids # cat 1000/cpu_rt_runtime 0 chirp uids # echo 450000 >0/cpu_rt_runtime echo: write error: invalid argument chirp uids # echo 450000 >1000/cpu_rt_runtime echo: write error: invalid argument chirp uids # echo 950000 >0/cpu_rt_runtime echo: write error: invalid argument chirp uids # echo 0 >0/cpu_rt_runtime echo: write error: invalid argument
So it seems rt_schedulable() is never succeeding. Any ideas?
sched-related snippets from .config:
CONFIG_X86_SMP=y CONFIG_USE_GENERIC_SMP_HELPERS=y CONFIG_X86_64_SMP=y CONFIG_X86_HT=y
# CONFIG_CGROUPS is not set CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y CONFIG_GROUP_SCHED=y CONFIG_FAIR_GROUP_SCHED=y CONFIG_RT_GROUP_SCHED=y CONFIG_USER_SCHED=y # CONFIG_CGROUP_SCHED is not set
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