Re: [LNG] Re: [Query] Ticks happen in pair for NO_HZ_FULL cores ?

2014-01-07 Thread Viresh Kumar
On 7 January 2014 14:17, Peter Zijlstra wrote: > On Mon, Dec 23, 2013 at 01:48:02PM +0530, Viresh Kumar wrote: >> *But wouldn't it make sense if we can tell scheduler that don't queue >> these works on a CPU that is running in NO_HZ_FULL mode?* > > No,.. that's the wrong way around. Hmm.. Just to

Re: [LNG] Re: [Query] Ticks happen in pair for NO_HZ_FULL cores ?

2014-01-07 Thread Peter Zijlstra
On Mon, Dec 23, 2013 at 01:48:02PM +0530, Viresh Kumar wrote: > *But wouldn't it make sense if we can tell scheduler that don't queue > these works on a CPU that is running in NO_HZ_FULL mode?* No,.. that's the wrong way around. > Also any suggestions on how to get rid of __prandom_timer events o

Re: [LNG] Re: [Query] Ticks happen in pair for NO_HZ_FULL cores ?

2014-01-06 Thread Viresh Kumar
On 23 December 2013 13:48, Viresh Kumar wrote: > Wrong time, probably many people on vacation now. But I am working, so > will continue reporting my problems, in case somebody is around :) Ping!! (Probably many people would be back from their vacations.) -- To unsubscribe from this list: send the

Re: [LNG] Re: [Query] Ticks happen in pair for NO_HZ_FULL cores ?

2013-12-23 Thread Viresh Kumar
Adding Ingo/Peter.. On 18 December 2013 20:03, Viresh Kumar wrote: > On 18 December 2013 19:21, Kevin Hilman wrote: >> Ah, I see. So you're basically asking why we can't evaluate whether to >> turn off the tick more often, for example right after the workqueues are >> done. I suppose Frederic

Re: [LNG] Re: [Query] Ticks happen in pair for NO_HZ_FULL cores ?

2013-12-18 Thread Viresh Kumar
On 18 December 2013 19:21, Kevin Hilman wrote: > Ah, I see. So you're basically asking why we can't evaluate whether to > turn off the tick more often, for example right after the workqueues are > done. I suppose Frederic may have some views on that, but there's > likely additional overhead from