linux-kernel - [RFC PATCH v2 6/9] mm/damon: add default allow/reject behavior fields to struct damos

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Message-Id: <20250227015754.38789-7-sj@kernel.org>
Date: Wed, 26 Feb 2025 17:57:51 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH v2 6/9] mm/damon: add default allow/reject behavior fields to struct damos

Current default allow/reject behavior of filters handling stage has made
before introduction of the allow behavior.  For allow-filters usage, it
is confusing and inefficient.

It is more intuitive to decide the default filtering stage allow/reject
behavior as opposite to the last filter's behavior.  The decision should
be made separately for core and operations layers' filtering stages,
since last core layer-handled filter is not really a last filter if
there are operations layer handling filters.

Keeping separate decisions for the two categories can make the logic
simpler.  Add fields for storing the two decisions.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/linux/damon.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index add82fdc1117..1d8479f57f85 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -497,6 +497,9 @@ struct damos {
 	unsigned long next_apply_sis;
 	/* informs if ongoing DAMOS walk for this scheme is finished */
 	bool walk_completed;
+	/* whether to reject core/ops filters umatched regions */
+	bool core_filters_default_reject;
+	bool ops_filters_default_reject;
 /* public: */
 	struct damos_quota quota;
 	struct damos_watermarks wmarks;
-- 
2.39.5