linux-kernel - Re: [PATCH 2/2] ftrace: add stack trace to function tracer

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Date:	Fri, 16 Jan 2009 11:08:24 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Chris Mason" <chris.mason@...cle.com>,
	"Steven Rostedt" <srostedt@...hat.com>
Subject: Re: [PATCH 2/2] ftrace: add stack trace to function tracer

Hi Steven,

2009/1/16 Steven Rostedt <rostedt@...dmis.org>:
> +static struct tracer_flags func_flags = {
> +       .val = 0, /* By default: all flags disabled */
> +       .opts = func_opts
> +};
> +
> +static int func_set_flag(u32 old_flags, u32 bit, int set)
> +{
> +       if (bit == TRACE_FUNC_OPT_STACK) {
> +               /* do nothing if already set */
> +               if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
> +                       return 0;


This is just a small thing but set will always be 1 or 0. And if you want
the current val of your options, you can take old_flags :-)

Would you prefer I send a patch to not call the set_flag callback
when the option set/unset by the user is already set/unset ?


> +               if (set)
> +                       register_ftrace_function(&trace_stack_ops);
> +               else
> +                       unregister_ftrace_function(&trace_stack_ops);
> +
> +               return 0;
> +       }
> +
> +       return -EINVAL;
> +}
> +
>  static struct tracer function_trace __read_mostly =
>  {
>        .name        = "function",
>        .init        = function_trace_init,
>        .reset       = function_trace_reset,
>        .start       = function_trace_start,
> +       .flags          = &func_flags,
> +       .set_flag       = func_set_flag,
>  #ifdef CONFIG_FTRACE_SELFTEST
>        .selftest    = trace_selftest_startup_function,
>  #endif
> --
> 1.5.6.5
>
> --
>
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