diff mbox series

[RFC,3/4] lru_gen: convert avg_total and avg_refaulted to atomic

Message ID 20230725185733.43929-4-ryncsn@gmail.com (mailing list archive)
State New
Headers show
Series Refault distance checking for MGLRU | expand

Commit Message

Kairui Song July 25, 2023, 6:57 p.m. UTC 
From: Kairui Song <kasong@tencent.com>

No feature change, prepare for later patch.

Signed-off-by: Kairui Song <kasong@tencent.com>
---
 include/linux/mmzone.h |  4 ++--
 mm/vmscan.c            | 16 ++++++++--------
 2 files changed, 10 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 5e50b78d58ea..4ab6bedd3c5b 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -425,9 +425,9 @@  struct lru_gen_folio {
 	/* the multi-gen LRU sizes, eventually consistent */
 	long nr_pages[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES];
 	/* the exponential moving average of refaulted */
-	unsigned long avg_refaulted[ANON_AND_FILE][MAX_NR_TIERS];
+	atomic_long_t avg_refaulted[ANON_AND_FILE][MAX_NR_TIERS];
 	/* the exponential moving average of evicted+protected */
-	unsigned long avg_total[ANON_AND_FILE][MAX_NR_TIERS];
+	atomic_long_t avg_total[ANON_AND_FILE][MAX_NR_TIERS];
 	/* the first tier doesn't need protection, hence the minus one */
 	unsigned long protected[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS - 1];
 	/* can be modified without holding the LRU lock */
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e7906f7fdc77..d34817795c70 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3705,9 +3705,9 @@  static void read_ctrl_pos(struct lruvec *lruvec, int type, int tier, int gain,
 	struct lru_gen_folio *lrugen = &lruvec->lrugen;
 	int hist = lru_hist_from_seq(lrugen->min_seq[type]);
 
-	pos->refaulted = lrugen->avg_refaulted[type][tier] +
+	pos->refaulted = atomic_long_read(&lrugen->avg_refaulted[type][tier]) +
 			 atomic_long_read(&lrugen->refaulted[hist][type][tier]);
-	pos->total = lrugen->avg_total[type][tier] +
+	pos->total = atomic_long_read(&lrugen->avg_total[type][tier]) +
 		     atomic_long_read(&lrugen->evicted[hist][type][tier]);
 	if (tier)
 		pos->total += lrugen->protected[hist][type][tier - 1];
@@ -3732,15 +3732,15 @@  static void reset_ctrl_pos(struct lruvec *lruvec, int type, bool carryover)
 		if (carryover) {
 			unsigned long sum;
 
-			sum = lrugen->avg_refaulted[type][tier] +
+			sum = atomic_long_read(&lrugen->avg_refaulted[type][tier]) +
 			      atomic_long_read(&lrugen->refaulted[hist][type][tier]);
-			WRITE_ONCE(lrugen->avg_refaulted[type][tier], sum / 2);
+			atomic_long_set(&lrugen->avg_refaulted[type][tier], sum / 2);
 
-			sum = lrugen->avg_total[type][tier] +
+			sum = atomic_long_read(&lrugen->avg_total[type][tier]) +
 			      atomic_long_read(&lrugen->evicted[hist][type][tier]);
 			if (tier)
 				sum += lrugen->protected[hist][type][tier - 1];
-			WRITE_ONCE(lrugen->avg_total[type][tier], sum / 2);
+			atomic_long_set(&lrugen->avg_total[type][tier], sum / 2);
 		}
 
 		if (clear) {
@@ -5869,8 +5869,8 @@  static void lru_gen_seq_show_full(struct seq_file *m, struct lruvec *lruvec,
 
 			if (seq == max_seq) {
 				s = "RT ";
-				n[0] = READ_ONCE(lrugen->avg_refaulted[type][tier]);
-				n[1] = READ_ONCE(lrugen->avg_total[type][tier]);
+				n[0] = atomic_long_read(&lrugen->avg_refaulted[type][tier]);
+				n[1] = atomic_long_read(&lrugen->avg_total[type][tier]);
 			} else if (seq == min_seq[type] || NR_HIST_GENS > 1) {
 				s = "rep";
 				n[0] = atomic_long_read(&lrugen->refaulted[hist][type][tier]);