Messages in this thread | | | Date | Tue, 28 Sep 2010 17:33:20 -0700 | From | "Paul E. McKenney" <> | Subject | [PATCH RFC tip/core/rcu 0/3] v1 RCU priority boosting |
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Hello!
This patch set is the first version of RCU priority boosting, consisting of the following:
1. Add RCU priority inversion testing to rcutorture. 2. Move TINY_RCU grace-period processing from softirq to kthread to allow boosting. 3. Implement RCU priority boosting for TINY_RCU.
This patch has the following shortcomings, and thus is not yet ready for inclusion:
o It does not yet include some restructuring of TREE_RCU that is required to make boosting practical.
o It does not yet include boosting for TREE_RCU.
o Documentation has not yet been updated. In the meantime, it is important to note that the "rcu_kthread" process must have its priority set to at least SCHED_FIFO:2, given that rcutorture uses SCHED_FIFO:1 to do the testing. This priority can be set using the new RCU_BOOST_PRIO kernel configuration parameter or by using the "chrt" command, for example, "chrt -p 2 6".
o A great deal more testing is required.
o There are probably quite a few bugs remaining, even in the parts done thus far.
Thanx, Paul
b/include/linux/init_task.h | 9 + b/include/linux/rcupdate.h | 1 b/include/linux/rcutiny.h | 8 - b/include/linux/rcutree.h | 1 b/include/linux/sched.h | 11 + b/init/Kconfig | 39 ++++++ b/kernel/rcutiny.c | 71 +++++++++-- b/kernel/rcutiny_plugin.h | 15 +- b/kernel/rcutorture.c | 270 ++++++++++++++++++++++++++++++++++++++++++-- kernel/rcutiny.c | 66 ++++------ kernel/rcutiny_plugin.h | 206 ++++++++++++++++++++++++++++++++- 11 files changed, 608 insertions(+), 89 deletions(-)
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