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authorHarshad Shirwadkar <harshadshirwadkar@gmail.com>2020-10-15 13:38:01 -0700
committerTheodore Ts'o <tytso@mit.edu>2020-10-21 23:22:38 -0400
commitce8c59d197c824789e1ade6f25d36037b4f0faeb (patch)
tree45bfb01966b90868489244222bf3fc3363d5a1b7 /fs
parent0f0672ffb61aebac906cf0aa1607d1f07f266fb6 (diff)
ext4: add fast commit stats in procfs
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/ext4.h2
-rw-r--r--fs/ext4/fast_commit.c34
-rw-r--r--fs/ext4/sysfs.c2
3 files changed, 37 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 152500725acf..0906fd48424b 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -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,
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 426c0ab8b70c..447c8d93f480 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -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,
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index bfabb799fa45..5ff33d18996a 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -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);
}