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

[Daeho Jeong <daeho43@gmail.com>]

From: Daeho Jeong <daehojeong@google.com>

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

Signed-off-by: Daeho Jeong <daehojeong@google.com>
---
 fs/f2fs/gc.c | 13 +++++++++++--
 fs/f2fs/gc.h |  1 +
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index b5d3fd40b17a..d6d71aab94f3 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1728,8 +1728,17 @@ 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 + sbi->migration_granularity;
+		if (gc_type == BG_GC) {
+			unsigned int migration_granularity =
+				sbi->migration_granularity;
+
+			if (f2fs_sb_has_blkzoned(sbi) &&
+					!has_enough_free_blocks(sbi,
+					LIMIT_BOOST_ZONED_GC))
+				migration_granularity *= BOOST_GC_MULTIPLE;
+
+			end_segno = start_segno + migration_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 14ae85f33235..33848d550153 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_GRANULARITY_ZONED	3
+#define BOOST_GC_MULTIPLE	5
 
 #define DEF_GC_FAILED_PINNED_FILES	2048
 #define MAX_GC_FAILED_PINNED_FILES	USHRT_MAX
-- 
2.46.0.469.g59c65b2a67-goog