linux-kernel - Re: [RFC PATCH 09/10] tracing: Use the hashlist for graph function

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Message-ID: <4B5D5B68.6020806@cn.fujitsu.com>
Date:	Mon, 25 Jan 2010 16:50:48 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: [RFC PATCH 09/10] tracing: Use the hashlist for graph function

Frederic Weisbecker wrote:
> When we set a filter to start tracing from a given function in
> the function graph tracer, the filter is stored in a linear array.
> 
> It doesn't scale very well, we even limited the number of such
> functions to 32.
> 
> Now that we have a hashlist of functions, lets put a field inside
> each function node so that we can check if a function is one of
> these filters using the hashlist, not a linear array.

The linear array @ftrace_graph_funcs is still used in this patch.
we still limit the number of such functions to 32?

[...]
>  #define FTRACE_GRAPH_MAX_FUNCS		32
>  extern int ftrace_graph_count;
>  extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
> -
> -static inline int ftrace_graph_addr(unsigned long addr)
> -{
> -	int i;
> -
> -	if (!ftrace_graph_count)
> -		return 1;

Here return 1.

[...]
> +static inline int ftrace_graph_addr(unsigned long addr)
> +{
> +	struct func_node *rec;
> +	struct func_hlist *hlist;
> +
> +	if (!ftrace_graph_count)
> +		return 0;
> +

But in this patch, return 0 here, the behave will be changed.
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