Re: [PATCH -mm v8 0/7] idle memory tracking

[Vladimir Davydov <vdavydov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>]

On Wed, Jul 15, 2015 at 01:47:15PM -0700, Andres Lagar-Cavilla wrote:
> I think the remaining question here is performance.
> 
> Have you conducted any studies where
> - there is a workload
> - a daemon is poking kpageidle every N seconds/minutes
> - what is the daemon cpu consumption?
> - what is the workload degradation if any?
> 
> N candidates include 30 seconds, 1 minute, 2 minutes, 5 minutes....
> 
> Workload candidates include TPC, spec int memory intensive things like
> 429.mcf, stream (http://www.cs.virginia.edu/stream/ "sustainable
> memory bandwidth" vs floating point performance)
> 
> I'm not asking for a research paper, but if, say, a 2 minute-period
> daemon introduces no degradation and adds up to a minute of cpu per
> hour, then we're golden.

Fair enough. Will do that soon and report back.

Thanks a lot for the review, it was really helpful!

Vladimir