Re: [PATCH v4] mm/damon: simplify scheme create in lru_sort.c

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Reviewed-by: Xin Hao <xhao@xxxxxxxxxxxxxxxxx>

Thanks.

在 2022/9/15 下午9:30, SeongJae Park 写道:
From: Xin Hao <xhao@xxxxxxxxxxxxxxxxx>

In damon_lru_sort_new_hot_scheme() and damon_lru_sort_new_cold_scheme(),
they have so much in common, so we can combine them into a single
function, and we just need to distinguish their differences.

Suggested-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Xin Hao <xhao@xxxxxxxxxxxxxxxxx>
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
changes from v3
(https://lore.kernel.org/damon/20220915023655.41923-1-xhao@xxxxxxxxxxxxxxxxx/)
- Cosmetic cleanups

Changes from v2
(https://lore.kernel.org/linux-mm/20220914113859.37637-1-xhao@xxxxxxxxxxxxxxxxx/)
- Add static global 'struct damos_access_pattern' stub variable

  mm/damon/lru_sort.c | 39 +++++++++++++++++----------------------
  1 file changed, 17 insertions(+), 22 deletions(-)

diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
index 46e7c0738bc5..abfaf471e3e9 100644
--- a/mm/damon/lru_sort.c
+++ b/mm/damon/lru_sort.c
@@ -132,6 +132,18 @@ DEFINE_DAMON_MODULES_DAMOS_STATS_PARAMS(damon_lru_sort_cold_stat,
  		lru_sort_tried_cold_regions, lru_sorted_cold_regions,
  		cold_quota_exceeds);
+struct damos_access_pattern damon_lru_sort_stub_pattern = {
+	/* Find regions having PAGE_SIZE or larger size */
+	.min_sz_region = PAGE_SIZE,
+	.max_sz_region = ULONG_MAX,
+	/* no matter its access frequency */
+	.min_nr_accesses = 0,
+	.max_nr_accesses = UINT_MAX,
+	/* no matter its age */
+	.min_age_region = 0,
+	.max_age_region = UINT_MAX,
+};
+
  static struct damon_ctx *ctx;
  static struct damon_target *target;
@@ -157,36 +169,19 @@ static struct damos *damon_lru_sort_new_scheme(
  /* Create a DAMON-based operation scheme for hot memory regions */
  static struct damos *damon_lru_sort_new_hot_scheme(unsigned int hot_thres)
  {
-	struct damos_access_pattern pattern = {
-		/* Find regions having PAGE_SIZE or larger size */
-		.min_sz_region = PAGE_SIZE,
-		.max_sz_region = ULONG_MAX,
-		/* and accessed for more than the threshold */
-		.min_nr_accesses = hot_thres,
-		.max_nr_accesses = UINT_MAX,
-		/* no matter its age */
-		.min_age_region = 0,
-		.max_age_region = UINT_MAX,
-	};
+	struct damos_access_pattern pattern = damon_lru_sort_stub_pattern;
+ pattern.min_nr_accesses = hot_thres;
  	return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_PRIO);
  }
/* Create a DAMON-based operation scheme for cold memory regions */
  static struct damos *damon_lru_sort_new_cold_scheme(unsigned int cold_thres)
  {
-	struct damos_access_pattern pattern = {
-		/* Find regions having PAGE_SIZE or larger size */
-		.min_sz_region = PAGE_SIZE,
-		.max_sz_region = ULONG_MAX,
-		/* and not accessed at all */
-		.min_nr_accesses = 0,
-		.max_nr_accesses = 0,
-		/* for min_age or more micro-seconds */
-		.min_age_region = cold_thres,
-		.max_age_region = UINT_MAX,
-	};
+	struct damos_access_pattern pattern = damon_lru_sort_stub_pattern;
+ pattern.max_nr_accesses = 0;
+	pattern.min_age_region = cold_thres;
  	return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_DEPRIO);
  }




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