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

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Date:	Tue, 7 Apr 2015 12:58:46 -0400
From:	Trond Myklebust <trond.myklebust@...marydata.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linux Kernel Mailing List <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

Hi Steve,

On Tue, Apr 7, 2015 at 12:40 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> 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).

Thanks! Yes the trond.myklebust@...marydata.com address is the correct one.

> -- 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>

Acked-by: Trond Myklebust <trond.myklebust@...marydata.com>

>> ---
>>  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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