This addresses high GC cost at runtime.
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
include/f2fs_fs.h | 8 +++++++-
mkfs/f2fs_format.c | 5 +++--
2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index fc56396fa358..870a6e4823d2 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -1775,6 +1775,12 @@ static inline uint32_t get_reserved(struct
f2fs_super_block *sb, double ovp)
return round_up(reserved, segs_per_sec) * segs_per_sec;
}
+static inline uint32_t overprovision_segment_buffer(struct f2fs_super_block
*sb)
+{
+ /* Give 6 current sections to avoid huge GC overheads. */
+ return 6 * get_sb(segs_per_sec);
+}
+
static inline double get_best_overprovision(struct f2fs_super_block *sb)
{
double ovp, candidate, end, diff, space;
@@ -1798,7 +1804,7 @@ static inline double get_best_overprovision(struct
f2fs_super_block *sb)
if (ovp < 0)
continue;
space = usable_main_segs - max((double)reserved, ovp) -
- 2 * get_sb(segs_per_sec);
+ overprovision_segment_buffer(sb);
if (max_space < space) {
max_space = space;
max_ovp = candidate;
diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index 8f632f8d74b4..e26a513ed80c 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -778,7 +778,8 @@ static int f2fs_write_check_point_pack(void)
* In non configurable reserved section case, overprovision
* segments are always bigger than two sections.
*/
- if (get_cp(overprov_segment_count) < 2 * get_sb(segs_per_sec)) {
+ if (get_cp(overprov_segment_count) <
+ overprovision_segment_buffer(sb)) {
MSG(0, "\tError: Not enough overprovision segments
(%u)\n",
get_cp(overprov_segment_count));
goto free_cp_payload;
@@ -787,7 +788,7 @@ static int f2fs_write_check_point_pack(void)
get_cp(rsvd_segment_count));
} else {
set_cp(overprov_segment_count, get_cp(overprov_segment_count) +
- 2 * get_sb(segs_per_sec));
+ overprovision_segment_buffer(sb));
}
if (f2fs_get_usable_segments(sb) <= get_cp(overprov_segment_count)) {
--
2.44.0.478.gd926399ef9-goog
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