[RFC PATCH v2 4/9] mm/damon/core: put ops-handled filters to damos->ops_filters

SeongJae Park
2025-02-27T01:58:05Z

damos->ops_filters has introduced to be used for all operations layer
handled filters. But DAMON kernel API callers can put any type of DAMOS
filters to any of damos->filters and damos->ops_filters. DAMON
user-space ABI users have no way to use ->ops_filters at all. Update
damos_add_filter(), which should be used by API callers to install DAMOS
filters, to given filters to ->filters and ->ops_filters depending on
their handling layer. The change forces both API callers and ABI users
to use proper lists since ABI users use the API internally.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
mm/damon/core.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index ffdd84ff6fa5..78126a5145fd 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -281,9 +281,24 @@ struct damos_filter *damos_new_filter(enum damos_filter_type type,
return filter;
}

+static bool damos_filter_for_ops(enum damos_filter_type type)
+{
+ switch (type) {
+ case DAMOS_FILTER_TYPE_ADDR:
+ case DAMOS_FILTER_TYPE_TARGET:
+ return false;
+ default:
+ break;
+ }
+ return true;
+}
+
void damos_add_filter(struct damos *s, struct damos_filter *f)
{
- list_add_tail(&f->list, &s->filters);
+ if (damos_filter_for_ops(f->type))
+ list_add_tail(&f->list, &s->ops_filters);
+ else
+ list_add_tail(&f->list, &s->filters);
}

static void damos_del_filter(struct damos_filter *f)
--
2.39.5