linux-kernel - Re: [PATCH v7 23/36] function_graph: Add a new exit handler with parent_ip and ftrace

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Date: Thu, 15 Feb 2024 10:39:43 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>, Florent Revest
 <revest@...omium.org>, linux-trace-kernel@...r.kernel.org, LKML
 <linux-kernel@...r.kernel.org>, Martin KaFai Lau <martin.lau@...ux.dev>,
 bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>, Alexei
 Starovoitov <ast@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Arnaldo
 Carvalho de Melo <acme@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Alan Maguire <alan.maguire@...cle.com>, Mark Rutland
 <mark.rutland@....com>, Peter Zijlstra <peterz@...radead.org>, Thomas
 Gleixner <tglx@...utronix.de>, Guo Ren <guoren@...nel.org>
Subject: Re: [PATCH v7 23/36] function_graph: Add a new exit handler with
 parent_ip and ftrace_regs

On Wed,  7 Feb 2024 00:11:44 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Add a new return handler to fgraph_ops as 'retregfunc'  which takes
> parent_ip and ftrace_regs instead of ftrace_graph_ret. This handler
> is available only if the arch support CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
> Note that the 'retfunc' and 'reregfunc' are mutual exclusive.
> You can set only one of them.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
>

> @@ -1076,6 +1083,7 @@ struct fgraph_ops {
>  	trace_func_graph_ent_t		entryfunc;
>  	trace_func_graph_ret_t		retfunc;
>  	trace_func_graph_regs_ent_t	entryregfunc;
> +	trace_func_graph_regs_ret_t	retregfunc;

Same for this:

struct fgraph_ops {
	union {
		trace_func_graph_ent_t		entryfunc;
		trace_func_graph_regs_ent_t	entryregfunc;
	};
	union {
		trace_func_graph_ret_t		retfunc;
		trace_func_graph_regs_ret_t	retregfunc;
	}

-- Steve


>  	struct ftrace_ops		ops; /* for the hash lists */
>  	void				*private;
>  	int				idx;