The patch titled
Subject: mm/damon/core: set damos_filter default allowance behavior based on installed filters
has been added to the -mm mm-unstable branch. Its filename is
mm-damon-core-set-damos_filter-default-allowance-behavior-based-on-installed-filters.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-set-damos_filter-default-allowance-behavior-based-on-installed-filters.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/core: set damos_filter default allowance behavior based on installed filters
Date: Tue, 4 Mar 2025 13:19:11 -0800
Decide whether to allow or reject by default on core and opertions layer
handled filters evaluation stages. It is decided as the opposite of the
last installed filter's behavior. If there is no filter at all, allow by
default. If there is any operations layer handled filters, core layer's
filtering stage sets allowing as the default behavior regardless of the
last filter of core layer-handling ones, since the last filter of core
layer handled filters in the case is not really the last filter of the
entire filtering stage.
Also, make the core layer's DAMOS filters handling stage uses the newly
set behavior field.
Link: https://lkml.kernel.org/r/20250304211913.53574-8-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/core.c | 34 ++++++++++++++++++++++++++++++++--
1 file changed, 32 insertions(+), 2 deletions(-)
--- a/mm/damon/core.c~mm-damon-core-set-damos_filter-default-allowance-behavior-based-on-installed-filters
+++ a/mm/damon/core.c
@@ -891,6 +891,32 @@ static int damos_commit_ops_filters(stru
return 0;
}
+/**
+ * damos_filters_default_reject() - decide whether to reject memory that didn't
+ * match with any given filter.
+ * @filters: Given DAMOS filters of a group.
+ */
+static bool damos_filters_default_reject(struct list_head *filters)
+{
+ struct damos_filter *last_filter;
+
+ if (list_empty(filters))
+ return false;
+ last_filter = list_last_entry(filters, struct damos_filter, list);
+ return last_filter->allow;
+}
+
+static void damos_set_filters_default_reject(struct damos *s)
+{
+ if (!list_empty(&s->ops_filters))
+ s->core_filters_default_reject = false;
+ else
+ s->core_filters_default_reject =
+ damos_filters_default_reject(&s->filters);
+ s->ops_filters_default_reject =
+ damos_filters_default_reject(&s->ops_filters);
+}
+
static int damos_commit_filters(struct damos *dst, struct damos *src)
{
int err;
@@ -898,7 +924,11 @@ static int damos_commit_filters(struct d
err = damos_commit_core_filters(dst, src);
if (err)
return err;
- return damos_commit_ops_filters(dst, src);
+ err = damos_commit_ops_filters(dst, src);
+ if (err)
+ return err;
+ damos_set_filters_default_reject(dst);
+ return 0;
}
static struct damos *damon_nth_scheme(int n, struct damon_ctx *ctx)
@@ -1580,7 +1610,7 @@ static bool damos_filter_out(struct damo
return !filter->allow;
}
}
- return false;
+ return s->core_filters_default_reject;
}
/*
_
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
selftests-damon-damos_quota-make-real-expectation-of-quota-exceeds.patch
selftests-damon-damon_nr_regions-set-ops-update-for-merge-results-check-to-100ms.patch
selftests-damon-damon_nr_regions-sort-collected-regiosn-before-checking-with-min-max-boundaries.patch
mm-damon-respect-core-layer-filters-allowance-decision-on-ops-layer.patch
mm-damon-core-initialize-damos-walk_completed-in-damon_new_scheme.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
mm-damon-add-data-structure-for-monitoring-intervals-auto-tuning.patch
mm-damon-core-implement-intervals-auto-tuning.patch
mm-damon-sysfs-implement-intervals-tuning-goal-directory.patch
mm-damon-sysfs-commit-intervals-tuning-goal.patch
mm-damon-sysfs-implement-a-command-to-update-auto-tuned-monitoring-intervals.patch
docs-mm-damon-design-document-for-intervals-auto-tuning.patch
docs-abi-damon-document-intervals-auto-tuning-abi.patch
docs-admin-guide-mm-damon-usage-add-intervals_goal-directory-on-the-hierarchy.patch
mm-damon-core-introduce-damos-ops_filters.patch
mm-damon-paddr-support-ops_filters.patch
mm-damon-core-support-committing-ops_filters.patch
mm-damon-core-put-ops-handled-filters-to-damos-ops_filters.patch
mm-damon-paddr-support-only-damos-ops_filters.patch
mm-damon-add-default-allow-reject-behavior-fields-to-struct-damos.patch
mm-damon-core-set-damos_filter-default-allowance-behavior-based-on-installed-filters.patch
mm-damon-paddr-respect-ops_filters_default_reject.patch
docs-mm-damon-design-update-for-changed-filter-default-behavior.patch
