Messages in this thread | | | Date | Tue, 10 Jun 2014 12:24:03 +0100 | From | Morten Rasmussen <> | Subject | Re: [RFC PATCH 02/16] sched: Introduce CONFIG_SCHED_ENERGY |
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On Tue, Jun 10, 2014 at 11:23:53AM +0100, Peter Zijlstra wrote: > On Tue, Jun 10, 2014 at 11:06:41AM +0100, Morten Rasmussen wrote: > > How would you like to disable the energy stuff for users for whom > > latency is everything? > > > > I mean, we are adding some extra load/utilization tracking. While I > > think we should do everything possible to minimize the overhead, I think > > it is unrealistic to assume that it will be zero. Is a some extra 'if > > (energy_enabled)' acceptable? > > > > I'm open for other suggestions. > > We have the jump-label stuff to do self modifying code ;-) The only > thing we need to be careful with is data-layout.
Thanks. I can see that it is already used in for various bit in kernel/sched/*. I didn't catch anything in Documentation/static-keys.txt related to data-layout caveats. Is there some other documentation/patches I should read before messing everything up? ;-)
> So I'm _hoping_ we can do all this without more CONFIG knobs, because > {PREEMPT*SMP*CGROUP^3*NUMA^2} is already entirely annoying to > build and run test, not to mention that distro builds will have no other > option than to enable everything anyhow.
Fair enough.
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