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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>
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 @@ skip_recovery:
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);