Commit 8939a848 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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f2fs: atgc: export entries for better tunability via sysfs 



This patch export below sysfs entries for better ATGC tunability.

/sys/fs/f2fs/<disk>/atgc_candidate_ratio
/sys/fs/f2fs/<disk>/atgc_candidate_count
/sys/fs/f2fs/<disk>/atgc_age_weight
/sys/fs/f2fs/<disk>/atgc_age_threshold

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 4a67d9b0

Documentation/ABI/testing/sysfs-fs-f2fs

+28 −0
Original line number Diff line number Diff line
@@ -438,3 +438,31 @@ Description: Show the count of inode newly enabled for compression since mount. 
		Note that when the compression is disabled for the files, this count

		doesn't decrease. If you write "0" here, you can initialize

		compr_new_inode to "0".



What:		/sys/fs/f2fs/<disk>/atgc_candidate_ratio

Date:		May 2021

Contact:	"Chao Yu" <yuchao0@huawei.com>

Description:	When ATGC is on, it controls candidate ratio in order to limit total

		number of potential victim in all candidates, the value should be in

		range of [0, 100], by default it was initialized as 20(%).



What:		/sys/fs/f2fs/<disk>/atgc_candidate_count

Date:		May 2021

Contact:	"Chao Yu" <yuchao0@huawei.com>

Description:	When ATGC is on, it controls candidate count in order to limit total

		number of potential victim in all candidates, by default it was

		initialized as 10 (sections).



What:		/sys/fs/f2fs/<disk>/atgc_age_weight

Date:		May 2021

Contact:	"Chao Yu" <yuchao0@huawei.com>

Description:	When ATGC is on, it controls age weight to balance weight proportion

		in between aging and valid blocks, the value should be in range of

		[0, 100], by default it was initialized as 60(%).



What:		/sys/fs/f2fs/<disk>/atgc_age_threshold

Date:		May 2021

Contact:	"Chao Yu" <yuchao0@huawei.com>

Description:	When ATGC is on, it controls age threshold to bypass GCing young

		candidates whose age is not beyond the threshold, by default it was

		initialized as 604800 seconds (equals to 7 days).

fs/f2fs/sysfs.c

+27 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ enum { 
#endif

	RESERVED_BLOCKS,	/* struct f2fs_sb_info */

	CPRC_INFO,	/* struct ckpt_req_control */

	ATGC_INFO,	/* struct atgc_management */

};



struct f2fs_attr {
@@ -75,6 +76,8 @@ static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type) 
#endif

	else if (struct_type == CPRC_INFO)

		return (unsigned char *)&sbi->cprc_info;

	else if (struct_type == ATGC_INFO)

		return (unsigned char *)&sbi->am;

	return NULL;

}
@@ -495,6 +498,20 @@ static ssize_t __sbi_store(struct f2fs_attr *a, 
	}

#endif



	if (!strcmp(a->attr.name, "atgc_candidate_ratio")) {

		if (t > 100)

			return -EINVAL;

		sbi->am.candidate_ratio = t;

		return count;

	}



	if (!strcmp(a->attr.name, "atgc_age_weight")) {

		if (t > 100)

			return -EINVAL;

		sbi->am.age_weight = t;

		return count;

	}



	*ui = (unsigned int)t;



	return count;
@@ -710,6 +727,11 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_written_block, compr_written_block); 
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_saved_block, compr_saved_block);

F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_new_inode, compr_new_inode);

#endif

/* For ATGC */

F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_ratio, candidate_ratio);

F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_count, max_candidate_count);

F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_weight, age_weight);

F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_threshold, age_threshold);



#define ATTR_LIST(name) (&f2fs_attr_##name.attr)

static struct attribute *f2fs_attrs[] = {
@@ -778,6 +800,11 @@ static struct attribute *f2fs_attrs[] = { 
	ATTR_LIST(compr_saved_block),

	ATTR_LIST(compr_new_inode),

#endif

	/* For ATGC */

	ATTR_LIST(atgc_candidate_ratio),

	ATTR_LIST(atgc_candidate_count),

	ATTR_LIST(atgc_age_weight),

	ATTR_LIST(atgc_age_threshold),

	NULL,

};

ATTRIBUTE_GROUPS(f2fs);