[f2fs-dev] [PATCH v2 4/7] f2fs: increase BG GC migration window granularity when boosted for zoned devices

[Daeho Jeong <daeho43@gmail.com>]

From: Daeho Jeong <daehojeong@google.com>

Need bigger BG GC migration window granularity when free section is
running low.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
---
 fs/f2fs/gc.c | 12 ++++++++++--
 fs/f2fs/gc.h |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 5cd316d2102d..9a3d3994cf2b 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1728,10 +1728,18 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
 			sec_end_segno -= SEGS_PER_SEC(sbi) -
 					f2fs_usable_segs_in_sec(sbi, segno);
 
-		if (gc_type == BG_GC)
-			end_segno = start_segno +
+		if (gc_type == BG_GC) {
+			unsigned int window_granularity =
 				sbi->migration_window_granularity;
 
+			if (f2fs_sb_has_blkzoned(sbi) &&
+					!has_enough_free_blocks(sbi,
+					LIMIT_BOOST_ZONED_GC))
+				window_granularity *= BOOST_GC_MULTIPLE;
+
+			end_segno = start_segno + window_granularity;
+		}
+
 		if (end_segno > sec_end_segno)
 			end_segno = sec_end_segno;
 	}
diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h
index 245f93663745..78abeebd68b5 100644
--- a/fs/f2fs/gc.h
+++ b/fs/f2fs/gc.h
@@ -33,6 +33,7 @@
 #define LIMIT_NO_ZONED_GC	60 /* percentage over total user space of no gc for zoned devices */
 #define LIMIT_BOOST_ZONED_GC	25 /* percentage over total user space of boosted gc for zoned devices */
 #define DEF_MIGRATION_WINDOW_GRANULARITY_ZONED	3
+#define BOOST_GC_MULTIPLE	5
 
 #define DEF_GC_FAILED_PINNED_FILES	2048
 #define MAX_GC_FAILED_PINNED_FILES	USHRT_MAX
-- 
2.46.0.598.g6f2099f65c-goog



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