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>

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 4849b8e..5088281 100644 (file)
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -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).

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 39b522e..dc71bc9 100644 (file)
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -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);