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mm/damon: document non-zero length damon_region assumption

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DAMON regions are assumed to always be non-zero length.  There was a
confusion [1] about it, probably due to lack of the documentation. 
Document it.

Link: https://lkml.kernel.org/r/20260307195356.203753-5-sj@kernel.org
Link: https://lore.kernel.org/20251231070029.79682-1-sj@kernel.org/ [1]
Signed-off-by: SeongJae Park <sj@kernel.org>
Acked-by: wang lian <lianux.mm@gmail.com>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2026-03-07 11:53:52 -08:00
committed by Andrew Morton
parent 2a5f4454e0
commit 3802e1d98e
1 changed files with 2 additions and 0 deletions
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include/linux/damon.h
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@@ -55,6 +55,8 @@ struct damon_size_range {
* @list: List head for siblings.
* @age: Age of this region.
*
* For any use case, @ar should be non-zero positive size.
*
* @nr_accesses is reset to zero for every &damon_attrs->aggr_interval and be
* increased for every &damon_attrs->sample_interval if an access to the region
* during the last sampling interval is found. The update of this field should