linux-kernel - Re: [BUG] perf sched broken

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Message-ID: <20110113132003.GA17903@ghostprotocols.net>
Date:	Thu, 13 Jan 2011 11:20:03 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	Robert Richter <robert.richter@....com>
Subject: Re: [BUG] perf sched broken

Em Wed, Jan 12, 2011 at 05:53:55PM -0800, Corey Ashford escreveu:
> On 01/12/2011 01:29 AM, Stephane Eranian wrote:
>> Hi,
>>
>> I am trying to use perf sched from tip-x86 but it fails for all my attempts.
>>
>> First of, I think the event list is stale. This is not so much the
>> events themselves
>> but rather the flags.
>>
>> Looks to me like the :r modifier is not supported anymore, so a patch like the
>> one below is needed. That helps collect a trace. But then, you can dump
>> the trace.
>
> After looking at this in more detail, I agree with Stephane: the 'r'  
> option appears to only be supported for hardware breakpoint events.  My  
> patch just causes the 'r' to be properly processed and rejected as a  
> legal option.

And thus broke 'perf sched' because it uses it, thanks to this
discussion we figured out that 'perf sched' shouldn't be using it :)

So thank you and Stephane, I'm applying his patch. That ':r' stuff makes
no sense and I couldn't find it being parsed anywhere, historical
bitrotted baggage it seems.

Thanks a lot!

- Arnaldo
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