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Currently both expedited and regular grace period stall warnings use a single timeout value that with units of seconds. However, recent Android use cases problem require a sub-100-millisecond expedited RCU CPU stall warning. Given that expedited RCU grace periods normally complete in far less than a single millisecond, especially for small systems, this is not unreasonable. Therefore introduce the CONFIG_RCU_EXP_CPU_STALL_TIMEOUT kernel configuration that defaults to 20 msec on Android and remains the same as that of the non-expedited stall warnings otherwise. It also can be changed in run-time via: /sys/.../parameters/rcu_exp_cpu_stall_timeout. [ paulmck: Default of zero to use CONFIG_RCU_STALL_TIMEOUT. ] Signed-off-by: Uladzislau Rezki <uladzislau.rezki@sony.com> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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| .. | ||
| Design | ||
| arrayRCU.rst | ||
| checklist.rst | ||
| index.rst | ||
| listRCU.rst | ||
| lockdep-splat.rst | ||
| lockdep.rst | ||
| NMI-RCU.rst | ||
| rcu_dereference.rst | ||
| rcu.rst | ||
| rcubarrier.rst | ||
| rculist_nulls.rst | ||
| rcuref.rst | ||
| RTFP.txt | ||
| stallwarn.rst | ||
| torture.rst | ||
| UP.rst | ||
| whatisRCU.rst | ||