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f2fs: add auto tuning for small devices

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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>
This commit is contained in:
Jaegeuk Kim 2018-02-22 14:09:30 -08:00
parent 079396270b
commit 84b89e5d94
2 changed files with 16 additions and 0 deletions
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2
fs/f2fs/segment.h
View file

@ -596,6 +596,8 @@ static inline int utilization(struct f2fs_sb_info *sbi)
#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,

14
fs/f2fs/super.c
View file

@ -2515,6 +2515,18 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
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;
@ -2867,6 +2879,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
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);