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Commit 84b89e5d authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

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: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 07939627

fs/f2fs/segment.h

+2 −0
Original line number Diff line number Diff line
@@ -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,

fs/f2fs/super.c

+14 −0
Original line number Diff line number Diff line
@@ -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);