The patch titled
Subject: mm/damon: implement a new DAMOS filter type for unmapped pages
has been added to the -mm mm-unstable branch. Its filename is
mm-damon-implement-a-new-damos-filter-type-for-unmapped-pages.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-implement-a-new-damos-filter-type-for-unmapped-pages.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: mm/damon: implement a new DAMOS filter type for unmapped pages
Date: Wed, 19 Feb 2025 14:01:45 -0800
Patch series "mm/damon: introduce DAMOS filter type for unmapped pages".
User decides whether their memory will be mapped or unmapped. It implies
that the two types of memory can have different characteristics and
management requirements. Provide the DAMON-observaibility DAMOS-operation
capability for the different types by introducing a new DAMOS filter type
for unmapped pages.
This patch (of 2):
Implement yet another DAMOS filter type for unmapped pages on DAMON kernel
API, and add support of it from the physical address space DAMON
operations set (paddr). Since it is for only unmapped pages, support from
the virtual address spaces DAMON operations set (vaddr) is not required.
Link: https://lkml.kernel.org/r/20250219220146.133650-1-sj@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20250219220146.133650-2-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/damon.h | 2 ++
mm/damon/paddr.c | 3 +++
mm/damon/sysfs-schemes.c | 1 +
3 files changed, 6 insertions(+)
--- a/include/linux/damon.h~mm-damon-implement-a-new-damos-filter-type-for-unmapped-pages
+++ a/include/linux/damon.h
@@ -337,6 +337,7 @@ struct damos_stat {
* @DAMOS_FILTER_TYPE_MEMCG: Specific memcg's pages.
* @DAMOS_FILTER_TYPE_YOUNG: Recently accessed pages.
* @DAMOS_FILTER_TYPE_HUGEPAGE_SIZE: Page is part of a hugepage.
+ * @DAMOS_FILTER_TYPE_UNMAPPED: Unmapped pages.
* @DAMOS_FILTER_TYPE_ADDR: Address range.
* @DAMOS_FILTER_TYPE_TARGET: Data Access Monitoring target.
* @NR_DAMOS_FILTER_TYPES: Number of filter types.
@@ -357,6 +358,7 @@ enum damos_filter_type {
DAMOS_FILTER_TYPE_MEMCG,
DAMOS_FILTER_TYPE_YOUNG,
DAMOS_FILTER_TYPE_HUGEPAGE_SIZE,
+ DAMOS_FILTER_TYPE_UNMAPPED,
DAMOS_FILTER_TYPE_ADDR,
DAMOS_FILTER_TYPE_TARGET,
NR_DAMOS_FILTER_TYPES,
--- a/mm/damon/paddr.c~mm-damon-implement-a-new-damos-filter-type-for-unmapped-pages
+++ a/mm/damon/paddr.c
@@ -236,6 +236,9 @@ static bool damos_pa_filter_match(struct
matched = filter->sz_range.min <= folio_sz &&
folio_sz <= filter->sz_range.max;
break;
+ case DAMOS_FILTER_TYPE_UNMAPPED:
+ matched = !folio_mapped(folio) || !folio_raw_mapping(folio);
+ break;
default:
break;
}
--- a/mm/damon/sysfs-schemes.c~mm-damon-implement-a-new-damos-filter-type-for-unmapped-pages
+++ a/mm/damon/sysfs-schemes.c
@@ -331,6 +331,7 @@ static const char * const damon_sysfs_sc
"memcg",
"young",
"hugepage_size",
+ "unmapped",
"addr",
"target",
};
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
selftests-damon-damos_quota_goal-handle-minimum-quota-that-cannot-be-further-reduced.patch
mm-madvise-split-out-mmap-locking-operations-for-madvise.patch
mm-madvise-split-out-madvise-input-validity-check.patch
mm-madvise-split-out-madvise-behavior-execution.patch
mm-madvise-remove-redundant-mmap_lock-operations-from-process_madvise.patch
mm-damon-avoid-applying-damos-action-to-same-entity-multiple-times.patch
mm-damon-core-unset-damos-walk_completed-after-confimed-set.patch
mm-damon-core-do-not-call-damos_walk_control-walk-if-walk-is-completed.patch
mm-damon-core-do-damos-walking-in-entire-regions-granularity.patch
mm-damon-introduce-damos-filter-type-hugepage_size-fix.patch
docs-mm-damon-design-fix-typo-on-damos-filters-usage-doc-link.patch
docs-mm-damon-design-document-hugepage_size-filter.patch
docs-damon-move-damos-filter-type-names-and-meaning-to-design-doc.patch
docs-mm-damon-design-clarify-handling-layer-based-filters-evaluation-sequence.patch
docs-mm-damon-design-categorize-damos-filter-types-based-on-handling-layer.patch
mm-damon-implement-a-new-damos-filter-type-for-unmapped-pages.patch
docs-mm-damon-design-document-unmapped-damos-filter-type.patch
