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From:   SeongJae Park <sj@kernel.org>
Cc:     linux-damon@amazon.com, damon@lists.linux.dev, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, SeongJae Park <sj@kernel.org>
Subject: [RFC PATCH 1/3] mm/damon/paddr: move DAMOS_PAGEOUT handling to a separate function
Date:   Fri, 13 May 2022 16:59:58 +0200
Message-Id: <20220513150000.25797-2-sj@kernel.org>
In-Reply-To: <20220513150000.25797-1-sj@kernel.org>
References: <20220513150000.25797-1-sj@kernel.org>
To:     unlisted-recipients:; (no To-header on input)
Precedence: bulk

This commit moves code for DAMOS_PAGEOUT handling to a separate function
other than damon_pa_apply_scheme() to make damon_pa_apply_scheme()
prepared for later additional DAMOS actions support.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 mm/damon/paddr.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 21474ae63bc7..08deee12ebfd 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -204,16 +204,11 @@ static unsigned int damon_pa_check_accesses(struct damon_ctx *ctx)
 	return max_nr_accesses;
 }
 
-static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
-		struct damon_target *t, struct damon_region *r,
-		struct damos *scheme)
+static unsigned long damon_pa_pageout(struct damon_region *r)
 {
 	unsigned long addr, applied;
 	LIST_HEAD(page_list);
 
-	if (scheme->action != DAMOS_PAGEOUT)
-		return 0;
-
 	for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) {
 		struct page *page = damon_get_page(PHYS_PFN(addr));
 
@@ -238,6 +233,19 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
 	return applied * PAGE_SIZE;
 }
 
+static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
+		struct damon_target *t, struct damon_region *r,
+		struct damos *scheme)
+{
+	switch (scheme->action) {
+	case DAMOS_PAGEOUT:
+		return damon_pa_pageout(r);
+	default:
+		break;
+	}
+	return 0;
+}
+
 static int damon_pa_scheme_score(struct damon_ctx *context,
 		struct damon_target *t, struct damon_region *r,
 		struct damos *scheme)
-- 
2.17.1