linux-kernel - Re: [PATCH 15/18 v3] SUNRPC: Export enums in tracepoints to user space

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Message-ID: <20150407124037.03675a2d@gandalf.local.home>
Date:	Tue, 7 Apr 2015 12:40:37 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Trond Myklebust <trond.myklebust@...marydata.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH 15/18 v3] SUNRPC: Export enums in tracepoints to user
 space


Trond,

I had your old email that I Cc'd this patch to. I updated this in my
git repo for your current email (if this is your current email).

-- Steve


On Thu, 02 Apr 2015 21:38:17 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> The enums used in the tracepoints for __print_symbolic() have their
> names shown in the tracepoint format files. User space tools do not know
> how to convert those names into their values to be able to convert the
> binary data.
> 
> Use TRACE_DEFINE_ENUM() to export the enum names to their values for
> userspace to do the parsing correctly.
> 
> Cc: Trond Myklebust <Trond.Myklebust@...app.com>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  include/trace/events/sunrpc.h | 62 ++++++++++++++++++++++++++++++-------------
>  1 file changed, 44 insertions(+), 18 deletions(-)
> 
> diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
> index b9c1dc6c825a..fd1a02cb3c82 100644
> --- a/include/trace/events/sunrpc.h
> +++ b/include/trace/events/sunrpc.h
> @@ -179,27 +179,53 @@ DEFINE_EVENT(rpc_task_queued, rpc_task_wakeup,
>  
>  );
>  
> +/*
> + * First define the enums in the below macros to be exported to userspace
> + * via TRACE_DEFINE_ENUM().
> + */
> +#undef EM
> +#undef EMe
> +#define EM(a, b)	TRACE_DEFINE_ENUM(a);
> +#define EMe(a, b)	TRACE_DEFINE_ENUM(a);
> +
> +#define RPC_SHOW_SOCKET				\
> +	EM( SS_FREE, "FREE" )			\
> +	EM( SS_UNCONNECTED, "UNCONNECTED" )	\
> +	EM( SS_CONNECTING, "CONNECTING," )	\
> +	EM( SS_CONNECTED, "CONNECTED," )	\
> +	EMe(SS_DISCONNECTING, "DISCONNECTING" )
> +
>  #define rpc_show_socket_state(state) \
> -	__print_symbolic(state, \
> -		{ SS_FREE, "FREE" }, \
> -		{ SS_UNCONNECTED, "UNCONNECTED" }, \
> -		{ SS_CONNECTING, "CONNECTING," }, \
> -		{ SS_CONNECTED, "CONNECTED," }, \
> -		{ SS_DISCONNECTING, "DISCONNECTING" })
> +	__print_symbolic(state, RPC_SHOW_SOCKET)
> +
> +RPC_SHOW_SOCKET
> +
> +#define RPC_SHOW_SOCK				\
> +	EM( TCP_ESTABLISHED, "ESTABLISHED" )	\
> +	EM( TCP_SYN_SENT, "SYN_SENT" )		\
> +	EM( TCP_SYN_RECV, "SYN_RECV" )		\
> +	EM( TCP_FIN_WAIT1, "FIN_WAIT1" )	\
> +	EM( TCP_FIN_WAIT2, "FIN_WAIT2" )	\
> +	EM( TCP_TIME_WAIT, "TIME_WAIT" )	\
> +	EM( TCP_CLOSE, "CLOSE" )		\
> +	EM( TCP_CLOSE_WAIT, "CLOSE_WAIT" )	\
> +	EM( TCP_LAST_ACK, "LAST_ACK" )		\
> +	EM( TCP_LISTEN, "LISTEN" )		\
> +	EMe( TCP_CLOSING, "CLOSING" )
>  
>  #define rpc_show_sock_state(state) \
> -	__print_symbolic(state, \
> -		{ TCP_ESTABLISHED, "ESTABLISHED" }, \
> -		{ TCP_SYN_SENT, "SYN_SENT" }, \
> -		{ TCP_SYN_RECV, "SYN_RECV" }, \
> -		{ TCP_FIN_WAIT1, "FIN_WAIT1" }, \
> -		{ TCP_FIN_WAIT2, "FIN_WAIT2" }, \
> -		{ TCP_TIME_WAIT, "TIME_WAIT" }, \
> -		{ TCP_CLOSE, "CLOSE" }, \
> -		{ TCP_CLOSE_WAIT, "CLOSE_WAIT" }, \
> -		{ TCP_LAST_ACK, "LAST_ACK" }, \
> -		{ TCP_LISTEN, "LISTEN" }, \
> -		{ TCP_CLOSING, "CLOSING" })
> +	__print_symbolic(state, RPC_SHOW_SOCK)
> +
> +RPC_SHOW_SOCK
> +
> +/*
> + * Now redefine the EM() and EMe() macros to map the enums to the strings
> + * that will be printed in the output.
> + */
> +#undef EM
> +#undef EMe
> +#define EM(a, b)	{a, b},
> +#define EMe(a, b)	{a, b}
>  
>  DECLARE_EVENT_CLASS(xs_socket_event,
>  

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