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

[SJ Park <sj@kernel.org>]

Hi Liew,

On Tue, 29 Sep 2026 03:13:06 +0800 Liew Rui Yan <aethernet65535@gmail.com> wrote:

> Hi SJ and Community,
> 
> I've noticed that damo [1] doesn't seem to have a feature for saving
> DAMON SYSFS configuration.  I tried 'damo args damon', but it doesn't
> save the DAMOS schemes information.

If so, it is a bug.  Could you share more details including how the issue can
be reproduced?  Directly sending a PR should also be fine.

> 'damo report damon --json' provides
> more detailed information, but its output cannot be read by 'damo start
> --kdamonds'.

Maybe this is also an issue that we could fix.

> 
> I'd like to know if there is currently any way in damo to save the DAMON
> SYSFS configuration that can be correctly read by 'damo start
> --kdamonds'.  If not, would it be worth adding one?

I believe it would be useful.  Please feel free to send a PR.

Nonetheless, we added the json/yaml kdamonds config support mainly because
there was no good way to flexibly configure kdamonds with the command line
interface.  Now it is much more improved [1].

I'd recommend using the command line interface.  That is, you could copy your
command line setup in a bash script and modify/reuse it.

Is there a use case that it cannot work or suboptimum?

[1] https://github.com/damonitor/damo/issues/3#issuecomment-5655965736


Thanks,
SJ

[...]