f2fs: add auto tuning for small devices
If f2fs is running on top of very small devices, it's worth to avoid abusing
free LBAs. In order to achieve that, this patch introduces some parameter
tuning.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index f11c4bc..dbb774aa 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -596,6 +596,8 @@
#define DEF_MIN_FSYNC_BLOCKS 8
#define DEF_MIN_HOT_BLOCKS 16
+#define SMALL_VOLUME_SEGMENTS (16 * 512) /* 16GB */
+
enum {
F2FS_IPU_FORCE,
F2FS_IPU_SSR,
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 2b65d34..2a854f9 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2519,6 +2519,18 @@
return 0;
}
+static void f2fs_tuning_parameters(struct f2fs_sb_info *sbi)
+{
+ struct f2fs_sm_info *sm_i = SM_I(sbi);
+
+ /* adjust parameters according to the volume size */
+ if (sm_i->main_segments <= SMALL_VOLUME_SEGMENTS) {
+ sbi->alloc_mode = ALLOC_MODE_REUSE;
+ sm_i->dcc_info->discard_granularity = 1;
+ sm_i->ipu_policy = 1 << F2FS_IPU_FORCE;
+ }
+}
+
static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{
struct f2fs_sb_info *sbi;
@@ -2871,6 +2883,8 @@
f2fs_join_shrinker(sbi);
+ f2fs_tuning_parameters(sbi);
+
f2fs_msg(sbi->sb, KERN_NOTICE, "Mounted with checkpoint version = %llx",
cur_cp_version(F2FS_CKPT(sbi)));
f2fs_update_time(sbi, CP_TIME);