Re: [PATCH] mm/damon: Add option to monitor only writes

[SeongJae Park]

On Fri, 4 Feb 2022 12:11:44 -0300 Pedro Gomes <pedrodemargomes@xxxxxxxxx> wrote:

> On Thu, Feb 3, 2022 at 10:39 AM SeongJae Park <sj@xxxxxxxxxx> wrote:
> 
> > I think this would be better to be implemented as another monitoring primitive
> > based on the virtual address space monitoring primitives, e.g., vaddr-writes?
> > Then the implementation would be simpler and changes to other files will be
> > minimized.  For the user space interface, we could use a prefix to target_ids
> > debugfs file.  For example,
> >
> >     # echo "vaddr-writes $(pidof workload)" > $debugfs/damon/target_ids
> 
> I will do that.

Thanks!

> 
> > > This patch also adds the actions mergeable and unmergeable to damos schemes.
> > > These actions are used by KSM as explained in [1].
> >
> > Please do that in a separate patch, and also update the document
> > (Documentation/admin-guide/mm/damon/usage.rst).  And, what's the expected usage
> > of the action and benefits?
> 
> The idea is to use this action to all areas that are not written too frequently,
> this way KSM can save more memory without too much overhead.
> But I have to test it better and collect some data to see if it really
> makes sense,
> perhaps it is better to leave this patch for later.
> I would like to know your opinion on this, do you think it makes sense?

Yes, that idea makes sense to me :)


Thanks,
SJ

> 
> 
> -- 
> Atenciosamente,
> Pedro Demarchi Gomes.