linux-kernel - Re: Fix powerTOP regression with 2.6.39-rc5

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Message-ID: <4DC8F831.2010404@linux.intel.com>
Date:	Tue, 10 May 2011 01:32:49 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	David Sharp <dhsharp@...gle.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@...radead.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: Fix powerTOP regression with 2.6.39-rc5

On
>> name: sched_switch
>> ID: 57
>> format:
>> 	field:unsigned short common_type;	offset:0;	size:2;
>> 	field:unsigned char common_flags;	offset:2;	size:1;
>> 	field:unsigned char common_preempt_count;	offset:3;	size:1;
>> 	field:int common_pid;	offset:4;	size:4;
>> 	field:int common_lock_depth;	offset:8;	size:4;
>>
>> 	field:char prev_comm[TASK_COMM_LEN];	offset:12;	size:16;
>> 	field:pid_t prev_pid;	offset:28;	size:4;
>> 	field:int prev_prio;	offset:32;	size:4;
>> 	field:long prev_state;	offset:40;	size:8;
>> 	field:char next_comm[TASK_COMM_LEN];	offset:48;	size:16;
>> 	field:pid_t next_pid;	offset:64;	size:4;
>> 	field:int next_prio;	offset:68;	size:4;
>>
>> Is equivalent to this:
>>
>> <?xml version="1.0" encoding="UTF-8"?>
>> <KernelShark><CaptureSettings><Events><CaptureType>Events</CaptureType><System>sched</System></Events><Plugin>function_graph</Plugin><File>/tmp/trace.dat</File></CaptureSettings></KernelShark>
> I did not say that it's equivalent, i said it's XML look-alike.
>
> Steve, we even joked about that, that if we continue like this we'll end up
> with an XML parser ... I requested several changes to the description format so
> that it becomes more human readable.

frankly, for software, XML is easier to deal with than the human 
readable form.

if we are serious about wanting software to parse this stuff.. maybe 
exposing it in an easy to parse format as well is not a bad idea....

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