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jbd2: Provide trace event for handle restarts 

Provide trace event for handle restarts to ease debugging.

Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191105164437.32602-24-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2019-11-05 17:44:30 +01:00 committed by Theodore Ts'o
parent 83448bdfb5
commit 0094f981bb
2 changed files with 22 additions and 2 deletions
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8
fs/jbd2/transaction.c
View File

@ -747,6 +747,7 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, int revoke_records,
journal_t *journal;
tid_t tid;
int need_to_start;
int ret;
/* If we've had an abort of any type, don't even think about
* actually doing the restart! */
@ -776,7 +777,12 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, int revoke_records,
DIV_ROUND_UP(revoke_records,
journal->j_revoke_records_per_block);
handle->h_revoke_credits = revoke_records;
return start_this_handle(journal, handle, gfp_mask);
ret = start_this_handle(journal, handle, gfp_mask);
trace_jbd2_handle_restart(journal->j_fs_dev->bd_dev,
ret ? 0 : handle->h_transaction->t_tid,
handle->h_type, handle->h_line_no,
handle->h_total_credits);
return ret;
}
EXPORT_SYMBOL(jbd2__journal_restart);

16
include/trace/events/jbd2.h
View File

@ -133,7 +133,7 @@ TRACE_EVENT(jbd2_submit_inode_data,
(unsigned long) __entry->ino)
);
TRACE_EVENT(jbd2_handle_start,
DECLARE_EVENT_CLASS(jbd2_handle_start_class,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int requested_blocks),
@ -161,6 +161,20 @@ TRACE_EVENT(jbd2_handle_start,
__entry->type, __entry->line_no, __entry->requested_blocks)
);
DEFINE_EVENT(jbd2_handle_start_class, jbd2_handle_start,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int requested_blocks),
TP_ARGS(dev, tid, type, line_no, requested_blocks)
);
DEFINE_EVENT(jbd2_handle_start_class, jbd2_handle_restart,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int requested_blocks),
TP_ARGS(dev, tid, type, line_no, requested_blocks)
);
TRACE_EVENT(jbd2_handle_extend,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int buffer_credits,