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ext4: add commit tid info in ext4_fc_commit_start/stop trace events 

This adds commit_tid info in ext4_fc_commit_start/stop which is helpful
in debugging fast_commit issues.

For e.g. issues where due to jbd2 journal full commit, FC miss to commit
updates to a file.

Also improves TP_prink format string i.e. all ext4 and jbd2 trace events
starts with "dev MAjOR,MINOR". Let's follow the same convention while we
are still at it.

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/ebcd6b9ab5b718db30f90854497886801ce38c63.1647057583.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Ritesh Harjani 2022-03-12 11:09:54 +05:30 committed by Theodore Ts'o
parent d9bf099cb9
commit 5641ace544
2 changed files with 15 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/ext4/fast_commit.c
View File

@ -1187,7 +1187,7 @@ static void ext4_fc_update_stats(struct super_block *sb, int status,
} else {
stats->fc_skipped_commits++;
}
trace_ext4_fc_commit_stop(sb, nblks, status);
trace_ext4_fc_commit_stop(sb, nblks, status, commit_tid);
}
/*
@ -1208,7 +1208,7 @@ int ext4_fc_commit(journal_t *journal, tid_t commit_tid)
if (!test_opt2(sb, JOURNAL_FAST_COMMIT))
return jbd2_complete_transaction(journal, commit_tid);
trace_ext4_fc_commit_start(sb);
trace_ext4_fc_commit_start(sb, commit_tid);
start_time = ktime_get();

21
include/trace/events/ext4.h
View File

@ -2686,26 +2686,29 @@ TRACE_EVENT(ext4_fc_replay,
);
TRACE_EVENT(ext4_fc_commit_start,
TP_PROTO(struct super_block *sb),
TP_PROTO(struct super_block *sb, tid_t commit_tid),
TP_ARGS(sb),
TP_ARGS(sb, commit_tid),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(tid_t, tid)
),
TP_fast_assign(
__entry->dev = sb->s_dev;
__entry->tid = commit_tid;
),
TP_printk("fast_commit started on dev %d,%d",
MAJOR(__entry->dev), MINOR(__entry->dev))
TP_printk("dev %d,%d tid %u", MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->tid)
);
TRACE_EVENT(ext4_fc_commit_stop,
TP_PROTO(struct super_block *sb, int nblks, int reason),
TP_PROTO(struct super_block *sb, int nblks, int reason,
tid_t commit_tid),
TP_ARGS(sb, nblks, reason),
TP_ARGS(sb, nblks, reason, commit_tid),
TP_STRUCT__entry(
__field(dev_t, dev)
@ -2714,6 +2717,7 @@ TRACE_EVENT(ext4_fc_commit_stop,
__field(int, num_fc)
__field(int, num_fc_ineligible)
__field(int, nblks_agg)
__field(tid_t, tid)
),
TP_fast_assign(
@ -2724,12 +2728,13 @@ TRACE_EVENT(ext4_fc_commit_stop,
__entry->num_fc_ineligible =
EXT4_SB(sb)->s_fc_stats.fc_ineligible_commits;
__entry->nblks_agg = EXT4_SB(sb)->s_fc_stats.fc_numblks;
__entry->tid = commit_tid;
),
TP_printk("fc on [%d,%d] nblks %d, reason %d, fc = %d, ineligible = %d, agg_nblks %d",
TP_printk("dev %d,%d nblks %d, reason %d, fc = %d, ineligible = %d, agg_nblks %d, tid %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->nblks, __entry->reason, __entry->num_fc,
__entry->num_fc_ineligible, __entry->nblks_agg)
__entry->num_fc_ineligible, __entry->nblks_agg, __entry->tid)
);
#define FC_REASON_NAME_STAT(reason) \