linux-kernel - Re: [PATCHv6 3/4] tracing: graph output support for irqsoff tracer

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Date:	Tue, 13 Apr 2010 01:33:37 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	mingo@...e.hu, rostedt@...dmis.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 3/4] tracing: graph output support for irqsoff tracer

On Fri, Apr 02, 2010 at 07:01:22PM +0200, Jiri Olsa wrote:
> +#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_CPU | \
> +			    TRACE_GRAPH_PRINT_PROC)
> +
> +static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
> +{
> +	u32 flags = GRAPH_TRACER_FLAGS;
> +
> +	if (trace_flags & TRACE_ITER_LATENCY_FMT)
> +		flags |= TRACE_GRAPH_PRINT_DURATION;
> +	else
> +		flags |= TRACE_GRAPH_PRINT_ABS_TIME;



Why not having ABS_TIME in any case?

And more important, you probably want to add TRACE_ITER_LATENCY_FMT
as well to get the contexts (need-resched, hardirq/softirq, preempt-depth,
lock-depth)



> +	/*
> +	 * In graph mode call the graph tracer output function,
> +	 * otherwise go with the TRACE_FN event handler
> +	 */
> +	if (is_graph())
> +		return print_graph_function_flags(iter, flags);
> +
> +	return TRACE_TYPE_UNHANDLED;
> +}
> +
> +static void irqsoff_print_header(struct seq_file *s)
> +{
> +	if (is_graph()) {
> +		struct trace_iterator *iter = s->private;
> +		u32 flags = GRAPH_TRACER_FLAGS;
> +
> +		if (trace_flags & TRACE_ITER_LATENCY_FMT) {
> +			/* print nothing if the buffers are empty */
> +			if (trace_empty(iter))
> +				return;
> +
> +			print_trace_header(s, iter);
> +			flags |= TRACE_GRAPH_PRINT_DURATION;
> +		} else
> +			flags |= TRACE_GRAPH_PRINT_ABS_TIME;
> +
> +		print_graph_headers_flags(s, flags);



Same here.


Other than these few comments, the whole set looks good!

Thanks!

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