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ext4: add fast commit stats in procfs

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This commit adds a file in procfs that tracks fast commit related
statistics.

root@kvm-xfstests:/mnt# cat /proc/fs/ext4/vdc/fc_info
fc stats:
7772 commits
15 ineligible
4083 numblks
2242us avg_commit_time
Ineligible reasons:
"Extended attributes changed":  0
"Cross rename": 0
"Journal flag changed": 0
"Insufficient memory":  0
"Swap boot":    0
"Resize":       0
"Dir renamed":  0
"Falloc range op":      0
"FC Commit Failed":     15

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20201015203802.3597742-10-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar 2020-10-15 13:38:01 -07:00 committed by Theodore Ts'o
parent 0f0672ffb6
commit ce8c59d197
3 changed files with 37 additions and 1 deletions
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2
fs/ext4/ext4.h
View File

@ -2740,7 +2740,7 @@ extern int ext4_init_inode_table(struct super_block *sb,
extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
/* fast_commit.c */
int ext4_fc_info_show(struct seq_file *seq, void *v);
void ext4_fc_init(struct super_block *sb, journal_t *journal);
void ext4_fc_init_inode(struct inode *inode);
void ext4_fc_track_range(struct inode *inode, ext4_lblk_t start,

34
fs/ext4/fast_commit.c
View File

@ -2093,6 +2093,40 @@ void ext4_fc_init(struct super_block *sb, journal_t *journal)
}
}
const char *fc_ineligible_reasons[] = {
"Extended attributes changed",
"Cross rename",
"Journal flag changed",
"Insufficient memory",
"Swap boot",
"Resize",
"Dir renamed",
"Falloc range op",
"FC Commit Failed"
};
int ext4_fc_info_show(struct seq_file *seq, void *v)
{
struct ext4_sb_info *sbi = EXT4_SB((struct super_block *)seq->private);
struct ext4_fc_stats *stats = &sbi->s_fc_stats;
int i;
if (v != SEQ_START_TOKEN)
return 0;
seq_printf(seq,
"fc stats:\n%ld commits\n%ld ineligible\n%ld numblks\n%lluus avg_commit_time\n",
stats->fc_num_commits, stats->fc_ineligible_commits,
stats->fc_numblks,
div_u64(sbi->s_fc_avg_commit_time, 1000));
seq_puts(seq, "Ineligible reasons:\n");
for (i = 0; i < EXT4_FC_REASON_MAX; i++)
seq_printf(seq, "\"%s\":\t%d\n", fc_ineligible_reasons[i],
stats->fc_ineligible_reason_count[i]);
return 0;
}
int __init ext4_fc_init_dentry_cache(void)
{
ext4_fc_dentry_cachep = KMEM_CACHE(ext4_fc_dentry_update,

2
fs/ext4/sysfs.c
View File

@ -521,6 +521,8 @@ int ext4_register_sysfs(struct super_block *sb)
proc_create_single_data("es_shrinker_info", S_IRUGO,
sbi->s_proc, ext4_seq_es_shrinker_info_show,
sb);
proc_create_single_data("fc_info", 0444, sbi->s_proc,
ext4_fc_info_show, sb);
proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
&ext4_mb_seq_groups_ops, sb);
}