linux-kernel - [RFC PATCH 4/6] mm/damon/vaddr: impleement eligible

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Message-Id: <20250629201443.52569-5-sj@kernel.org>
Date: Sun, 29 Jun 2025 13:14:41 -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 4/6] mm/damon/vaddr: impleement eligible_report() callback

For [f]vaddr DAMON ops, access reports for virtual address space of a
process that different from that for a given DAMON target shouldn't be
used.  Implement an eligible_report() callback for [f]vaddr that does
the check.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/vaddr.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 46554e49a478..9970f95585ed 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -610,6 +610,12 @@ static unsigned int damon_va_check_accesses(struct damon_ctx *ctx)
 	return max_nr_accesses;
 }
 
+static bool damon_va_eligible_report(struct damon_access_report *report,
+		struct damon_target *t)
+{
+	return report->pid == t->pid;
+}
+
 /*
  * Functions for the target validity check and cleanup
  */
@@ -710,6 +716,7 @@ static int __init damon_va_initcall(void)
 		.update = damon_va_update,
 		.prepare_access_checks = damon_va_prepare_access_checks,
 		.check_accesses = damon_va_check_accesses,
+		.eligible_report = damon_va_eligible_report,
 		.target_valid = damon_va_target_valid,
 		.cleanup = NULL,
 		.apply_scheme = damon_va_apply_scheme,
-- 
2.39.5