linux-kernel - [RFC PATCH 06/18] mm/damon/paddr: report filter-passed bytes back for normal actions

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Message-Id: <20241219040327.61902-7-sj@kernel.org>
Date: Wed, 18 Dec 2024 20:03:15 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: kernel-team@...a.com,
	SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 06/18] mm/damon/paddr: report filter-passed bytes back for normal actions

damon_operations->apply_scheme() implementations are requested to report
back how many bytes of the given region has passed DAMOS filter.
'paddr' operations set implementation supports some of region-internal
DAMOS filter handling for normal DAMOS actions except DAMOS_STAT action.
But, those are not respecting the request.  Report the region-internal
DAMOS filter-passed bytes back for the actions.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/paddr.c | 33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 3530ef9c80bd..5944316a0b4c 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -243,7 +243,8 @@ static bool damos_pa_filter_out(struct damos *scheme, struct folio *folio)
 	return false;
 }
 
-static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s)
+static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s,
+		unsigned long *sz_filter_passed)
 {
 	unsigned long addr, applied;
 	LIST_HEAD(folio_list);
@@ -272,6 +273,8 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s)
 
 		if (damos_pa_filter_out(s, folio))
 			goto put_folio;
+		else
+			*sz_filter_passed += folio_size(folio);
 
 		folio_clear_referenced(folio);
 		folio_test_clear_young(folio);
@@ -292,7 +295,8 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s)
 }
 
 static inline unsigned long damon_pa_mark_accessed_or_deactivate(
-		struct damon_region *r, struct damos *s, bool mark_accessed)
+		struct damon_region *r, struct damos *s, bool mark_accessed,
+		unsigned long *sz_filter_passed)
 {
 	unsigned long addr, applied = 0;
 
@@ -304,6 +308,8 @@ static inline unsigned long damon_pa_mark_accessed_or_deactivate(
 
 		if (damos_pa_filter_out(s, folio))
 			goto put_folio;
+		else
+			*sz_filter_passed += folio_size(folio);
 
 		if (mark_accessed)
 			folio_mark_accessed(folio);
@@ -317,15 +323,17 @@ static inline unsigned long damon_pa_mark_accessed_or_deactivate(
 }
 
 static unsigned long damon_pa_mark_accessed(struct damon_region *r,
-	struct damos *s)
+	struct damos *s, unsigned long *sz_filter_passed)
 {
-	return damon_pa_mark_accessed_or_deactivate(r, s, true);
+	return damon_pa_mark_accessed_or_deactivate(r, s, true,
+			sz_filter_passed);
 }
 
 static unsigned long damon_pa_deactivate_pages(struct damon_region *r,
-	struct damos *s)
+	struct damos *s, unsigned long *sz_filter_passed)
 {
-	return damon_pa_mark_accessed_or_deactivate(r, s, false);
+	return damon_pa_mark_accessed_or_deactivate(r, s, false,
+			sz_filter_passed);
 }
 
 static unsigned int __damon_pa_migrate_folio_list(
@@ -449,7 +457,8 @@ static unsigned long damon_pa_migrate_pages(struct list_head *folio_list,
 	return nr_migrated;
 }
 
-static unsigned long damon_pa_migrate(struct damon_region *r, struct damos *s)
+static unsigned long damon_pa_migrate(struct damon_region *r, struct damos *s,
+		unsigned long *sz_filter_passed)
 {
 	unsigned long addr, applied;
 	LIST_HEAD(folio_list);
@@ -462,6 +471,8 @@ static unsigned long damon_pa_migrate(struct damon_region *r, struct damos *s)
 
 		if (damos_pa_filter_out(s, folio))
 			goto put_folio;
+		else
+			*sz_filter_passed += folio_size(folio);
 
 		if (!folio_isolate_lru(folio))
 			goto put_folio;
@@ -481,14 +492,14 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
 {
 	switch (scheme->action) {
 	case DAMOS_PAGEOUT:
-		return damon_pa_pageout(r, scheme);
+		return damon_pa_pageout(r, scheme, sz_filter_passed);
 	case DAMOS_LRU_PRIO:
-		return damon_pa_mark_accessed(r, scheme);
+		return damon_pa_mark_accessed(r, scheme, sz_filter_passed);
 	case DAMOS_LRU_DEPRIO:
-		return damon_pa_deactivate_pages(r, scheme);
+		return damon_pa_deactivate_pages(r, scheme, sz_filter_passed);
 	case DAMOS_MIGRATE_HOT:
 	case DAMOS_MIGRATE_COLD:
-		return damon_pa_migrate(r, scheme);
+		return damon_pa_migrate(r, scheme, sz_filter_passed);
 	case DAMOS_STAT:
 		break;
 	default:
-- 
2.39.5