mm/damon/paddr: support DAMON_FILTER_TYPE_MEMCG

Implement the support of DAMON_FILTER_TYPE_MEMCG on the DAMON operation
set implementation for the physical address space.

Link: https://lore.kernel.org/20260518234119.97569-24-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 9997c5174ef1b91a2464a0218eba5ea0c9758e25..d0598f5f268822db98f57d1425b4e1dbeac55bff 100644 (file)
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -124,6 +124,7 @@ static bool damon_pa_filter_match(struct damon_filter *filter,
                struct folio *folio)
 {
        bool matched = false;
+       struct mem_cgroup *memcg;
 
        switch (filter->type) {
        case DAMON_FILTER_TYPE_ANON:
@@ -133,6 +134,19 @@ static bool damon_pa_filter_match(struct damon_filter *filter,
                }
                matched = folio_test_anon(folio);
                break;
+       case DAMON_FILTER_TYPE_MEMCG:
+               if (!folio) {
+                       matched = false;
+                       break;
+               }
+               rcu_read_lock();
+               memcg = folio_memcg_check(folio);
+               if (!memcg)
+                       matched = false;
+               else
+                       matched = filter->memcg_id == mem_cgroup_id(memcg);
+               rcu_read_unlock();
+               break;
        default:
                break;
        }