Re: [RFC] mm/damon/damo: saving damon sysfs configuration

[Liew Rui Yan <aethernet65535@gmail.com>]

On Fri, 09 Oct 2026 07:00:41 -0700 SJ Park <sj@kernel.org> wrote:

> Hi Liew,
> 
> On Fri,  9 Oct 2026 20:08:33 +0800 Liew Rui Yan <aethernet65535@gmail.com> wrote:
> 
> [...]
> > Yes.  My expected behavior is to completely save and restore the DAMON
> > SYSFS configuration, including DAMOS Schemes.  But it cannot done by
> > 'damo args damon'.
> > 
> > In the script I provided, it first apply lru.json and then uses
> > 'damo args damon' to export the current configuration file.
> 
> 'damo args damon' does not export the running DAMON parameters.  Why do you
> expect so?  Has some document confused you?

Thank you for your clarify.

Actually, there is no any document confused me.  'damo args' section in
USAGE.md is good enough.  I think it is just because I made assumption
about what 'damo args damon' would do.

> 
> > I expected
> > that reapplying this exported configuration (via 'damo start --kdamonds')
> > would fully restore the previous DAMON SYSFS setup.
> 
> So this expectation is wrong.
> 
> > 
> > However, the current/unexpected behavior is that it drops the DAMOS
> > Schemes configuration entirely.  In other words, I cannot fully save
> > and restore the DAMON SYSFS configuration using 'damo args damon'.
> 
> So it looks like there is not problem.  Please let me know if I'm missing
> something.

I will reduce these kinds of false positive from the next time.  At
least, I will state what behavior I expect.

[...]

Best regards,
Rui Yan