Re: [PATCH] hmp: Add "calc_dirty_rate" and "info dirty_rate" cmds

[Peter Xu <peterx@redhat.com>]

On Tue, Jun 08, 2021 at 07:49:56PM +0100, Dr. David Alan Gilbert wrote:
> * Peter Xu (peterx@redhat.com) wrote:
> > These two commands are missing when adding the QMP sister commands.  Add them,
> > so developers can play with them easier.
> > 
> > Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
> > Cc: Juan Quintela <quintela@redhat.com>
> > Cc: Leonardo Bras Soares Passos <lsoaresp@redhat.com>
> > Cc: Chuan Zheng <zhengchuan@huawei.com>
> > Cc: huangy81@chinatelecom.cn
> > Signed-off-by: Peter Xu <peterx@redhat.com>
> 
> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> 
> > ---
> > PS: I really doubt whether this is working as expected... I ran one 200MB/s
> > workload inside, what I measured is 20MB/s with current algorithm...  Sampling
> > 512 pages out of 1G mem is not wise enough I guess, especially that assumes
> > dirty workload is spread across the memories while it's normally not the case..
> 
> What size of address space did you dirty - was it 20MB?

IIRC it was either 200M or 500M, based on a 1G small VM.

-- 
Peter Xu