linux-kernel - Re: [PATCH 1/6] writeback: initial tracing support

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Date:	Fri, 04 Jun 2010 09:10:33 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Dave Chinner <david@...morbit.com>
CC:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 1/6] writeback: initial tracing support

> +TRACE_EVENT(writeback_queue,
> +
> +	TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_args *args),
> +
> +	TP_ARGS(bdi, args),
> +
> +	TP_STRUCT__entry(
> +		__array(char,		name,		16)
> +		__field(long,		nr_pages)
> +		__field(int,		sb)
> +		__field(int,		sync_mode)
> +		__field(int,		for_kupdate)
> +		__field(int,		range_cyclic)
> +		__field(int,		for_background)
> +	),
> +
> +	TP_fast_assign(
> +		strncpy(__entry->name, dev_name(bdi->dev), 16);

Should use strlcpy() ?

> +		__entry->nr_pages	= args->nr_pages;
> +		__entry->sb		= !!args->sb;
> +		__entry->for_kupdate	= args->for_kupdate;
> +		__entry->range_cyclic	= args->range_cyclic;
> +		__entry->for_background	= args->for_background;
> +	),
> +
> +	TP_printk("%s: pages=%ld, sb=%d, kupdate=%d, range_cyclic=%d "
> +		  "for_background=%d", __entry->name, __entry->nr_pages,
> +			__entry->sb, __entry->for_kupdate,
> +			__entry->range_cyclic, __entry->for_background)
> +);
> +
> +TRACE_EVENT(writeback_sched,
> +
> +	TP_PROTO(struct backing_dev_info *bdi, struct bdi_work *work,
> +		 const char *msg),
> +
> +	TP_ARGS(bdi, work, msg),
> +
> +	TP_STRUCT__entry(
> +		__array(char,			name,		16)
> +		__field(unsigned int,		work)
> +		__array(char,			task,		8)
> +	),
> +
> +	TP_fast_assign(
> +		strncpy(__entry->name, dev_name(bdi->dev), 16);

ditto

> +		__entry->work = (unsigned long) work & 0xffff;
> +		snprintf(__entry->task, 8, "%s", msg);
> +	),
> +
> +	TP_printk("work=%x, task=%s", __entry->work, __entry->task)
> +);

...

> +TRACE_EVENT(writeback_bdi_register,
> +
> +	TP_PROTO(const char *name, int start),
> +
> +	TP_ARGS(name, start),
> +
> +	TP_STRUCT__entry(
> +		__array(char,	name,		16)
> +		__field(int,	start)
> +	),
> +
> +	TP_fast_assign(
> +		strncpy(__entry->name, name, 16);

ditto

> +		__entry->start = start;
> +	),
> +
> +	TP_printk("%s: %s", __entry->name,
> +			__entry->start ? "registered" : "unregistered")
> +);
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