From: SeongJae Park <sj@kernel.org>
Date: Mon, 18 May 2026 23:41:11 +0000 (-0700)
Subject: mm/damon/paddr: support DAMON_FILTER_TYPE_MEMCG
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ba3be5430ffa7e5debec2e0fe61518a2db0489ca;p=thirdparty%2Flinux.git

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 9997c5174ef1..d0598f5f2688 100644
--- 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;
 	}