Preview of RCU patches for 2.6.39
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- v1 Latest3 of 14 patches 2 repliesIn review
3 of 14 patches are in this archive. The cover letter announces 14.
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 12/14 | rcu: priority boosting for TREE_PREEMPT_RCUinit/ kernel/ kernel/ +1 more | +364 | 0 replies | |
| 13/14 | rcu: eliminate unused boosting statisticskernel/ | +1 | 0 replies | |
| 14/14 | rcu: Add boosting to TREE_PREEMPT_RCU tracingkernel/ kernel/ kernel/ | +130 | 2 replies |
Reviews trailers per patch
None of the 3 patches has a Reviewed-by or Acked-by of their own; the series has one for all of them.
| Patch | Josh Triplett |
|---|---|
| Series | R-b |
| 12/14 | |
| 13/14 | |
| 14/14 |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH tip/core/rcu 0/14] Preview of RCU patches for 2.6.39
Hello!
This patchset fixes a few bugs and introduces some of the infrastructure for TREE_RCU priority boosting. If testing goes well, TREE_RCU priority boosting itself might make it as well. The patches are as follows:
1. call __rcu_read_unlock() in exit_rcu for tiny RCU to preserve
debug state (from Lai Jiangshan).
2. Get rid of duplicate sched.h include from rcutorture.c
(from Jesper Juhl).
3. Add documentation saying which RCU flavor to choose.
4. Remove dead code from DEBUG_OBJECTS_RCU_HEAD implementation
(from Amerigo Wang).
5. Document transitivity for memory barriers.
6. Remove conditional compilation for RCU CPU stall warnings.
(These can now be controlled by boot/module parameters.)
7. Decrease memory-barrier usage based on semi-formal proof.
Expedited RCU has invalidated an assumption that the old dyntick-idle interface depended on, and here is a fix. I am still working on a lighter-weight fix, but safety first!
8. Merge TREE_PREEPT_RCU blocked_tasks[] lists, which is a first
step towards TREE_RCU priority boosting.
9. Update documentation to reflect blocked_tasks[] merge.
10. move TREE_RCU from softirq to kthread, which is a second step
towards TREE_RCU priority boosting.
For a testing-only version of this patchset from git, please see the following subject-to-rebase branch:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git rcu/testing
I am more confident in the first five of the above patches, which are available at:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git rcu/next
Thanx, Paul