linux-kernel - Re: [PATCHv6 0/4] tracing: function graph output for preempt/irqs-off tracers

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Message-ID: <20100412073947.GE3430@jolsa.lab.eng.brq.redhat.com>
Date:	Mon, 12 Apr 2010 09:39:47 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	mingo@...e.hu, rostedt@...dmis.org, fweisbec@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 0/4] tracing: function graph output for
 preempt/irqs-off tracers

hi,
any feedback?

thanks,
jirka

On Fri, Apr 02, 2010 at 07:01:19PM +0200, Jiri Olsa wrote:
> hi,
> 
> updates based on comments by Frederic Weisbecker,
> also rebase to latest master.
> 
> I'm sending reworked version of the graph output support for
> preemptirqsoff/preemptoff/irqsoff tracers.
> 
> v6:
> - using stubs instead of ifdef in trace_irqsoff for graph
>   tracer's calls
> 
> v5:
> - function graph events are back in game
> - changed function graph tracer interface to be able to
>   pass custom tracer flags
> - changed calls to trace_function to trace graph records
>   when the display-graph otion is enabled.  As function tracer
>   and graph tracer have different spacing during the record
>   output, this way it looks better, and the info stays.
> 
>   This could be also done via TRACE_PRINT, then it'd be displayed
>   as comment.. I chose the first way, though it could be easily
>   changed.
> 
> v4:
> - fixed header to display all the info as for
>   current irqsoff tracer
> - fixed reset of the max_tr buffer during the
>   display-graph switch
> 
> v3:
> - the function_graph tracer should have the same output
>   as current version even with events enabled,
>   unless I missed something again ;)
> - I gave up the idea of function_graph events,
>   since it was unsuitable for outputing other
>   events as comments "/* */"
> - I'm not including the raw function_graph for now
> 
> 
> attached patches:
> - 1/4 adding ftrace events for graph tracer
> - 2/4 graph tracer - adding support for passing flags to ouput functions
> - 3/4 graph output support for irqsoff tracer
> - 4/4 graph output support for preemptirqsoff/preemptoff tracers
> 
> 
> plz let me know what you think
> 
> wbr,
> jirka
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