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| author | SeongJae Park <sj@kernel.org> | 2026-03-07 11:53:52 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-04-05 13:53:22 -0700 |
| commit | 3802e1d98e92ca6abdd25446b802f405fef83da0 (patch) | |
| tree | 32a11f5ff2fc3560a7083485028b3ef7336ec7c2 /include | |
| parent | 2a5f4454e00e630a3535b851fbe4f6e5d228cc5a (diff) | |
| download | linux-3802e1d98e92ca6abdd25446b802f405fef83da0.tar.gz linux-3802e1d98e92ca6abdd25446b802f405fef83da0.zip | |
mm/damon: document non-zero length damon_region assumption
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/damon.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/damon.h b/include/linux/damon.h index 60e6da3012fa..7d0265d02954 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -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 |