Messages in this thread | | | Date | Fri, 8 Jun 2012 11:04:17 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH tip/core/rcu 0/7] RCU_FAST_NO_HZ changes for 3.6 |
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* Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:
> 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.
Sure, that's sensible - could get this to me ASAP so that we can send it to Linus before -rc2? #3 and #4 are pretty large so we want them upstream ASAP.
Thanks,
Ingo
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