linux-kernel - Re: [BUG] perf_event: sampling buffer format cannot handle multi-event sampling

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Message-ID: <1303248056.2035.66.camel@laptop>
Date:	Tue, 19 Apr 2011 23:20:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>, mingo@...e.hu,
	Paul Mackerras <paulus@...ba.org>,
	Robert Richter <robert.richter@....com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [BUG] perf_event: sampling buffer format cannot handle
 multi-event sampling

On Tue, 2011-04-19 at 21:16 +0000, Stephane Eranian wrote:
> > Or simply don't mix different sample_types in the same buffer?
> >
> Does the kernel disallow this when you merge the output via that
> ioctl()? 

No, it will happily comply and provide you with hard to parse output.
Just don't do that if you're not willing to untangle it ;-)

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