On Wed, Feb 27, 2013 at 6:22 PM, Hartmut Behrens
<hartmut.behrens@xxxxxxxxx> wrote:
>> What happens if you compile and run this program on your kernel?
>> #include <stdio.h>
>> #include <stdlib.h>
>> #include <sched.h>
>> #include <errno.h>
>> #include <memory.h>
>>
>> int main(int argc, char **argv)
>> {
>> int ret;
>> struct sched_param s;
>>
>> memset(&s, 0, sizeof(s));
>> s.sched_priority = 1;
>> if ((sched_setscheduler(0, SCHED_FIFO, &s))) {
>> fprintf(stderr, "error changing policy: %s\n", strerror(errno));
>> exit(errno);
>> }
>> printf("successfully changed policy to SCHED_FIFO priority 1\n");
>> exit(0);
>> }
>
> When I run it as root I get "error changing policy: Operation not permitted".
>
> Does this mean that some hard limits are not correctly set for root?
Could a fix be to switch off CONFIG_RT_GROUP_SCHED ?
(http://www.kernel.org/doc/Documentation/scheduler/sched-rt-group.txt)
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