linux-kernel - Re: [PATCH 2/4] tracing/sched: Fix task states in sched switch event

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Date:	Tue, 25 May 2010 14:33:23 +0200
From:	Carsten Emde <C.Emde@...dl.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 2/4] tracing/sched: Fix task states in sched switch event

Hi Ingo,

>>> Hm, this is totally unreadable. What does 'TASK_STATE_X' mean??
>> Would this be better?
>> +#define MAKE_TASK_STATE_STRING(num) TASK_STATE_##num " (" DESCR_TASK_STATE_##num ")"
>>   static const char *task_state_array[] = {
>> -	"R (running)",		/*   0 */
>> -	"S (sleeping)",		/*   1 */
>> -	"D (disk sleep)",	/*   2 */
>> -	"T (stopped)",		/*   4 */
>> -	"t (tracing stop)",	/*   8 */
>> -	"Z (zombie)",		/*  16 */
>> -	"X (dead)",		/*  32 */
>> -	"x (dead)",		/*  64 */
>> -	"K (wakekill)",		/* 128 */
>> -	"W (waking)",		/* 256 */
>> +	MAKE_TASK_STATE_STRING(0),
>> +	MAKE_TASK_STATE_STRING(1),
>> +	MAKE_TASK_STATE_STRING(2),
>> +	MAKE_TASK_STATE_STRING(4),
>> +	MAKE_TASK_STATE_STRING(8),
>> +	MAKE_TASK_STATE_STRING(16),
>> +	MAKE_TASK_STATE_STRING(32),
>> +	MAKE_TASK_STATE_STRING(64),
>> +	MAKE_TASK_STATE_STRING(128),
>> +	MAKE_TASK_STATE_STRING(256)
>
> The whole enumeration there is pointless in that .c file - it tells nothing to
> the code reader.
>
> If it cannot be expressed in a meaningful way then introduce
> TASK_STATE_STRINGS_INIT construct that is defined next to the strings (in a .h
> file or so) - that way it's a coherent whole.
This is what I did and submitted some time ago. Is there anything else
you want me to change?

Thanks,

	Carsten.
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