linux-ext4 - Re: [PATCH -next] jbd2: use the correct print format

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Date:   Mon, 10 Oct 2022 22:35:42 +0800
From:   Jason Yan <yanaijie@...wei.com>
To:     Bixuan Cui <cuibixuan@...ux.alibaba.com>, <rostedt@...dmis.org>,
        <mhiramat@...nel.org>, <bvanassche@....org>, <axboe@...nel.dk>,
        <tytso@....edu>, <linux-kernel@...r.kernel.org>,
        <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH -next] jbd2: use the correct print format

Hi Bixuan,

On 2022/10/10 16:09, Bixuan Cui wrote:
> The print format error was found when using ftrace event:
>      <...>-1406 [000] .... 23599442.895823: jbd2_end_commit: dev 252,8 transaction -1866216965 sync 0 head -1866217368
>      <...>-1406 [000] .... 23599442.896299: jbd2_start_commit: dev 252,8 transaction -1866216964 sync 0
> 
> Print transaction and head with the unsigned format "%u" instead.
> 
> Fixes: 879c5e6b7cb4 ('jbd2: convert instrumentation from markers to tracepoints')
> Signed-off-by: Bixuan Cui <cuibixuan@...ux.alibaba.com>
> ---
>   include/trace/events/jbd2.h | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/trace/events/jbd2.h b/include/trace/events/jbd2.h
> index 99f783c..ce9accb 100644
> --- a/include/trace/events/jbd2.h
> +++ b/include/trace/events/jbd2.h
> @@ -40,7 +40,7 @@
>   	TP_STRUCT__entry(
>   		__field(	dev_t,	dev			)
>   		__field(	char,	sync_commit		  )
> -		__field(	int,	transaction		  )
> +		__field(	tid_t,	transaction		  )

While you are at it, can you make all the tid tracing consistent. Some 
tracing points using unsigned long such as:

TRACE_EVENT(jbd2_handle_extend,
	TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
		 unsigned int line_no, int buffer_credits,
		 int requested_blocks),

	TP_ARGS(dev, tid, type, line_no, buffer_credits, requested_blocks),


and the caller passing transaction->t_tid which is tid_t(unsigned int).

	trace_jbd2_handle_extend(journal->j_fs_dev->bd_dev,
				 transaction->t_tid,
				 handle->h_type, handle->h_line_no,
				 handle->h_total_credits,
				 nblocks);

Thanks,
Jason

>   	),
>   
>   	TP_fast_assign(
> @@ -49,7 +49,7 @@
>   		__entry->transaction	= commit_transaction->t_tid;
>   	),
>   
> -	TP_printk("dev %d,%d transaction %d sync %d",
> +	TP_printk("dev %d,%d transaction %u sync %d",




>   		  MAJOR(__entry->dev), MINOR(__entry->dev),
>   		  __entry->transaction, __entry->sync_commit)
>   );
> @@ -97,8 +97,8 @@
>   	TP_STRUCT__entry(
>   		__field(	dev_t,	dev			)
>   		__field(	char,	sync_commit		  )
> -		__field(	int,	transaction		  )
> -		__field(	int,	head		  	  )
> +		__field(	tid_t,	transaction		  )
> +		__field(	tid_t,	head		  	  )
>   	),
>   
>   	TP_fast_assign(
> @@ -108,7 +108,7 @@
>   		__entry->head		= journal->j_tail_sequence;
>   	),
>   
> -	TP_printk("dev %d,%d transaction %d sync %d head %d",
> +	TP_printk("dev %d,%d transaction %u sync %d head %u",
>   		  MAJOR(__entry->dev), MINOR(__entry->dev),
>   		  __entry->transaction, __entry->sync_commit, __entry->head)
>   );
>