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

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