This is to gather statistics to check if memory regions of specific
access tempratures are backed by hugepages of a size in a specific
range
This filter can help to observe and prove the effectivenes of
different schemes for shrinking/collapsing hugepages.
Signed-off-by: Usama Arif <usamaarif642@xxxxxxxxx>
---
include/linux/damon.h | 2 ++
mm/damon/paddr.c | 7 +++++++
mm/damon/sysfs-schemes.c | 1 +
3 files changed, 10 insertions(+)
diff --git a/include/linux/damon.h b/include/linux/damon.h
index 6f30ceeff215..5ba6c2114e3f 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -336,6 +336,7 @@ 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.
@@ -355,6 +356,7 @@ enum damos_filter_type {
DAMOS_FILTER_TYPE_ANON,
DAMOS_FILTER_TYPE_MEMCG,
DAMOS_FILTER_TYPE_YOUNG,
+ DAMOS_FILTER_TYPE_HUGEPAGE,
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 3f59a3fdc391..34fe1eb664cc 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -227,6 +227,7 @@ static bool damos_pa_filter_match(struct damos_filter *filter,
{
bool matched = false;
struct mem_cgroup *memcg;
+ size_t folio_sz;
switch (filter->type) {
case DAMOS_FILTER_TYPE_ANON:
@@ -246,6 +247,12 @@ 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:
+ folio_sz = folio_size(folio);
+ matched = filter->folio_size.min <= folio_sz && folio_sz <= filter->folio_size.max;
+ break;
+#endif
default:
break;
}
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index bc7ca43ca9c4..76aee3ab277e 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -330,6 +330,7 @@ static const char * const damon_sysfs_scheme_filter_type_strs[] = {
"anon",
"memcg",
"young",
+ "hugepage",
"addr",
"target",
};
--
2.43.5
