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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: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2021-05-12 10:07:19 +08:00 committed by Jaegeuk Kim
parent 4a67d9b07a
commit 8939a8489c
2 changed files with 55 additions and 0 deletions
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28
Documentation/ABI/testing/sysfs-fs-f2fs
View File

@ -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).

27
fs/f2fs/sysfs.c
View File

@ -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 @@ out:
}
#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);