linux-kernel - Re: [RFC PATCH 0/5] simplify the print fmt in the event format files

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Date:	Tue, 9 Jun 2009 08:57:06 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Hellwig <hch@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	Jiaying Zhang <jiayingz@...gle.com>
Subject: Re: [RFC PATCH 0/5] simplify the print fmt in the event format
 files


On Tue, 9 Jun 2009, Ingo Molnar wrote:
> 
> > 
> > We go from this:
> > 
> >  print fmt: "irq=%d handler=%s", REC->irq, (char *)((void *)REC + REC->__data_loc_name)
> > 
> > to this:
> > 
> >  format: irq=<int:irq> handler=<string:name>
> > 
> > and this:
> > 
> >   print fmt: "softirq=%d action=%s", REC->vec, ({ static const struct trace_print_flags symbols[] = { { HI_SOFTIRQ, "HI" }, { TIMER_SOFTIRQ, "TIMER" }, { NET_TX_SOFTIRQ, "NET_TX" }, { NET_RX_SOFTIRQ, "NET_RX" }, { BLOCK_SOFTIRQ, "BLOCK" }, { TASKLET_SOFTIRQ, "TASKLET" }, { SCHED_SOFTIRQ, "SCHED" }, { HRTIMER_SOFTIRQ, "HRTIMER" }, { RCU_SOFTIRQ, "RCU" }, { -1, ((void *)0) }}; ftrace_print_symbols_seq (p, REC->vec, symbols); })
> > 
> > To this:
> > 
> > format: softirq=<int:vec> action=<sym:vec:0=HI,1=TIMER,2=NET_TX,3=NET_RX,4=BLOCK,5=TASKLET,6=SCHED,7=HRTIMER,8=RCU
> 
> Introducing new, elaborate description languages is always risky. 
> Would there be a way to reuse something existing - ideally some nice 
> sub-set of C structure definitions?

I'm open for suggestions. Yeah, I was trying to avoid the new markup, but 
C is more for code and not for printing. In fact C sucks for text markup 
:-(

But I would also like to avoid a full xml parser in the kernel ;-)

> 
> Also, would it be possible to put more newlines into the format, so 
> that human inspection is more straightforward. It wont matter to the 
> tools.

Actually, you can add newlines in the tags, and they will not affect the 
mark up. Well, at least before the numbers. You can have:

<sym:vec:
  0=HI,
  1=TIMER,
  2=NET_TX,
  3=NET_RX,
  4=BLOCK,
  5=TASKLET,
  6=SCHED,
  7=HRTIMER,
  8=RCU>

But actually, this would make it harder on the tools. Since currently my 
tool just reads one entire line. But I guess I can fix that too.

-- Steve

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