linux-kernel - [RFC PATCH 2/6] mm/damon/core: add eliglble

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Message-Id: <20250629201443.52569-3-sj@kernel.org>
Date: Sun, 29 Jun 2025 13:14:39 -0700
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 2/6] mm/damon/core: add eliglble_report() ops callback

Not every reported access information will be eligible for all DAMON ops
and target.  For example, virtual address access report will be not
eligible for 'padr' ops, or monitoring targets for a process that
different from the process for the repor.  If it is for monitoring
accesses from specific CPU or write, reports from other CPUs or reads
should be ignored.  Add operations set callback for this report
eligibility checking.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/linux/damon.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index a2198909c903..9ec40ce7dde0 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -592,6 +592,7 @@ enum damon_ops_id {
  * @update:			Update operations-related data structures.
  * @prepare_access_checks:	Prepare next access check of target regions.
  * @check_accesses:		Check the accesses to target regions.
+ * @eligible_report:		Verify an access report for a target.
  * @get_scheme_score:		Get the score of a region for a scheme.
  * @apply_scheme:		Apply a DAMON-based operation scheme.
  * @target_valid:		Determine if the target is valid.
@@ -618,6 +619,8 @@ enum damon_ops_id {
  * last preparation and update the number of observed accesses of each region.
  * It should also return max number of observed accesses that made as a result
  * of its update.  The value will be used for regions adjustment threshold.
+ * @eligible_report should check if the given access report is eligible to be
+ * used by this operations set for the given target.
  * @get_scheme_score should return the priority score of a region for a scheme
  * as an integer in [0, &DAMOS_MAX_SCORE].
  * @apply_scheme is called from @kdamond when a region for user provided
@@ -635,6 +638,8 @@ struct damon_operations {
 	void (*update)(struct damon_ctx *context);
 	void (*prepare_access_checks)(struct damon_ctx *context);
 	unsigned int (*check_accesses)(struct damon_ctx *context);
+	bool (*eligible_report)(struct damon_access_report *report,
+			struct damon_target *t);
 	int (*get_scheme_score)(struct damon_ctx *context,
 			struct damon_target *t, struct damon_region *r,
 			struct damos *scheme);
-- 
2.39.5