Messages in this thread | | | Date | Thu, 5 Feb 2015 15:25:27 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH] sched, autogroup: Fix failure when writing to cpu.rt_runtime_us |
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On Thu, Feb 05, 2015 at 04:33:24PM +0800, Zefan Li wrote: > This is how to reproduce the bug: > > int main() { > struct sched_param param = {.sched_priority=1}; > > if (fork() > 0) > exit(0); > > setsid(); > > if (sched_setscheduler(0, SCHED_RR, ¶m) < 0){ > perror("failed to sched_setscheduler()"); > return -1; > } > > while(1) > ; > } > > # ./test > # mount -t cgroup -o cpu xxx /cgroup > # cat /cgroup/cpu.rt_runtime_us > 950000 > # echo 940000 > /cgroup/cpu.rt_runtime_us > Device or Resource busy
That's -EBUSY, but you're changing an -EPERM condition. Neither your patch nor explanation of the matter make sense.
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