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Diffstat (limited to 'Documentation/scheduler/sched-rt-group.rst')
| -rw-r--r-- | Documentation/scheduler/sched-rt-group.rst | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/Documentation/scheduler/sched-rt-group.rst b/Documentation/scheduler/sched-rt-group.rst index d685609ed3d7..ab464335d320 100644 --- a/Documentation/scheduler/sched-rt-group.rst +++ b/Documentation/scheduler/sched-rt-group.rst @@ -92,16 +92,19 @@ The system wide settings are configured under the /proc virtual file system: /proc/sys/kernel/sched_rt_runtime_us: A global limit on how much time real-time scheduling may use. This is always less or equal to the period_us, as it denotes the time allocated from the - period_us for the real-time tasks. Even without CONFIG_RT_GROUP_SCHED enabled, - this will limit time reserved to real-time processes. With - CONFIG_RT_GROUP_SCHED=y it signifies the total bandwidth available to all - real-time groups. + period_us for the real-time tasks. Without CONFIG_RT_GROUP_SCHED enabled, + this only serves for admission control of deadline tasks. With + CONFIG_RT_GROUP_SCHED=y it also signifies the total bandwidth available to + all real-time groups. * Time is specified in us because the interface is s32. This gives an operating range from 1us to about 35 minutes. * sched_rt_period_us takes values from 1 to INT_MAX. * sched_rt_runtime_us takes values from -1 to sched_rt_period_us. * A run time of -1 specifies runtime == period, ie. no limit. + * sched_rt_runtime_us/sched_rt_period_us > 0.05 inorder to preserve + bandwidth for fair dl_server. For accurate value check average of + runtime/period in /sys/kernel/debug/sched/fair_server/cpuX/ 2.2 Default behaviour |