Messages in this thread | | | Date | Thu, 7 Feb 2013 09:37:56 -0800 | From | "Paul E. McKenney" <> | Subject | Re: [ANNOUNCE] 3.8-rc6-nohz4 |
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On Thu, Feb 07, 2013 at 12:06:21PM -0500, Steven Rostedt wrote: > On Thu, 2013-02-07 at 08:30 -0800, Paul E. McKenney wrote: > > > I suspect that removal of jiffies from the kernel will take a few stages, > > with RCU being one of the laggards for awhile. Making RCU's state > > machine depend wholly on process-based execution will take some care > > and experimentation, especially for extreme and corner-case workloads. > > For example, having RCU OOM the system just because a specific CPU was > > unable to run some RCU kthread for an extended time is something to > > be avoided. ;-) > > Tickless doesn't mean no timeouts or periodic timers. I think we will > always have some sort of dynamic tick when needed. It will just be more > event driven then something that goes off constantly.
As long as we don't end up replacing a single tick with multiple hrtimers (or whatever), ending up with more overhead and disruption than we started with. ;-)
Thanx, Paul
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