diff mbox series

[v2,2/2] mm/damon: introduce DAMOS filter type hugepage

Message ID 20250120101650.3761306-2-usamaarif642@gmail.com (mailing list archive)
State New
Headers show
Series [v2,1/2] mm/damon: have damon_get_folio return folio even for tail pages | expand

Commit Message

Usama Arif Jan. 20, 2025, 10:16 a.m. UTC 
This is to gather statistics to check if memory regions of specific
access tempratures are backed by hugepages. This includes both THPs
and hugetlbfs.
This filter can help to observe and prove the effectivenes of
different schemes for shrinking/collapsing hugepages.

Signed-off-by: Usama Arif <usamaarif642@gmail.com>
---
v1 -> v2:
- Wrap DAMOS_FILTER_TYPE_HUGEPAGE case with
  CONFIG_PGTABLE_HAS_HUGE_LEAVES (SJ Park)
---
 include/linux/damon.h    | 4 ++++
 mm/damon/paddr.c         | 5 +++++
 mm/damon/sysfs-schemes.c | 3 +++
 3 files changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/damon.h b/include/linux/damon.h
index af525252b853..b0dbf380ab76 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -326,6 +326,7 @@  struct damos_stat {
  * @DAMOS_FILTER_TYPE_ANON:	Anonymous pages.
  * @DAMOS_FILTER_TYPE_MEMCG:	Specific memcg's pages.
  * @DAMOS_FILTER_TYPE_YOUNG:	Recently accessed pages.
+ * @DAMOS_FILTER_TYPE_HUGEPAGE:	Page is part of a hugepage.
  * @DAMOS_FILTER_TYPE_ADDR:	Address range.
  * @DAMOS_FILTER_TYPE_TARGET:	Data Access Monitoring target.
  * @NR_DAMOS_FILTER_TYPES:	Number of filter types.
@@ -345,6 +346,9 @@  enum damos_filter_type {
 	DAMOS_FILTER_TYPE_ANON,
 	DAMOS_FILTER_TYPE_MEMCG,
 	DAMOS_FILTER_TYPE_YOUNG,
+#if defined(CONFIG_PGTABLE_HAS_HUGE_LEAVES)
+	DAMOS_FILTER_TYPE_HUGEPAGE,
+#endif
 	DAMOS_FILTER_TYPE_ADDR,
 	DAMOS_FILTER_TYPE_TARGET,
 	NR_DAMOS_FILTER_TYPES,
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index c0ccf4fade24..224308140441 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -222,6 +222,11 @@  static bool damos_pa_filter_match(struct damos_filter *filter,
 		if (matched)
 			damon_folio_mkold(folio);
 		break;
+#if defined(CONFIG_PGTABLE_HAS_HUGE_LEAVES)
+	case DAMOS_FILTER_TYPE_HUGEPAGE:
+		matched = folio_size(folio) == HPAGE_PMD_SIZE;
+		break;
+#endif
 	default:
 		break;
 	}
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 98f93ae9f59e..3eb3ec464591 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -329,6 +329,9 @@  static const char * const damon_sysfs_scheme_filter_type_strs[] = {
 	"anon",
 	"memcg",
 	"young",
+#if defined(CONFIG_PGTABLE_HAS_HUGE_LEAVES)
+	"hugepage",
+#endif
 	"addr",
 	"target",
 };