RCU_FAST_NO_HZ changes for 3.6
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- v1 Latest0 of 7 patches 1 replyIn review
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None of the 7 patches the cover letter announces are in this archive.
Reviews trailers per patch
| Patch | Heiko Carstens | Pascal Chapperon |
|---|---|---|
| Series | T-b T-b T-b T-b T-b T-b | T-b T-b T-b T-b T-b T-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH tip/core/rcu 0/7] RCU_FAST_NO_HZ changes for 3.6
Hello!
This patch series provides more adjustments to the (relatively) new large-system-safe implementation for RCU_FAST_NO_HZ:
1. Remove RCU_FAST_NO_HZ dependency on stop_machine() nature of
CPU hotplug.
2. Make RCU_FAST_NO_HZ tracing distinguish between short and
long idle intervals.
3. Move RCU_FAST_NO_HZ per-CPU state variables to the rcu_dynticks
per-CPU structure.
4. Precompute RCU_FAST_NO_HZ timer offsets so that the timers
will actually be paid attention to. This fixes the slow-boot problem that hit a few people.
5. Convert ftrace_dump() calls in idle entry and idle exit from
DUMP_ALL to DUMP_ORIG.
6. Fix erroneous TINY_PREEMPT_RCU assumption that rcu_preempt_needs_cpu()
is a quiescent state (it is not).
7. Round RCU_FAST_NO_HZ lazy timeout to nearest second to conserve
power on systems with synchronized scheduler-clock interrupts.
I am considering pushing #1-#4 into 3.5 for the slow-boot regression. If you object, please let me know.
Thanx, Paul
b/include/linux/rcupdate.h | 2 b/include/linux/rcutiny.h | 6 + b/include/linux/rcutree.h | 2 b/include/trace/events/rcu.h | 1 b/kernel/rcutiny_plugin.h | 2 b/kernel/rcutree.c | 2 b/kernel/rcutree.h | 14 +++ b/kernel/rcutree_plugin.h | 8 +- b/kernel/time/tick-sched.c | 7 + kernel/rcutree.c | 4 - kernel/rcutree_plugin.h | 167 ++++++++++++++++++++++--------------------- 11 files changed, 124 insertions(+), 91 deletions(-)