Re: [PATCH v2] mm/damon/stat: monitor all System RAM resources

[SeongJae Park <sj@kernel.org>]

On Mon, 16 Mar 2026 10:25:39 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:

> On Sun, 15 Mar 2026 09:27:15 -0700 SeongJae Park <sj@kernel.org> wrote:
> 
> > DAMON_STAT usage document (Documentation/admin-guide/mm/damon/stat.rst)
> > says it monitors the system's entire physical memory.  But, it is
> > monitoring only the biggest System RAM resource of the system.  When
> > there are multiple System RAM resources, this results in monitoring only
> > an unexpectedly small fraction of the physical memory.  For example,
> > suppose the system has a 500 GiB System RAM, 10 MiB non-System RAM, and
> > 500 GiB System RAM resources in order on the physical address space.
> > DAMON_STAT will monitor only the first 500 GiB System RAM.  This
> > situation is particularly common on NUMA systems.
> > 
> > Select a physical address range that covers all System RAM areas of the
> > system, to fix this issue and make it work as documented.
> > 
> > Fixes: 369c415e6073 ("mm/damon: introduce DAMON_STAT module")
> > Cc: <stable@vger.kernel.org> # 6.17.x
> 
> This doesn't apply to current mainline?

Ah, you're right.  Sorry for this noise.

I will rebase it to mm-hotfixes-unstable and post it as v3, by tonight.  If you
prefer mainline or another tree other than mm-hotfixes-unsable as the baseline
of v3, please let me know.


Thanks,
SJ