linux-kernel - Re: perf_event_open() ABI compatability

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Message-ID: <20160111112802.GB4921@gmail.com>
Date:	Mon, 11 Jan 2016 12:28:02 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...il.com>
Subject: Re: perf_event_open() ABI compatability


* Alexander Shishkin <alexander.shishkin@...ux.intel.com> wrote:

> >> Ideally we would somehow want E2BIG returned plus the size of __reserved_1 if 
> >> the value of __reserved_1 is not zero.  I suppose at this point in the game 
> >> it's too late for this to be much help and we're going to have to work around 
> >> the problem forever anyway.
> >
> > Right :/ So I was hoping some of that extended error reporting stuff from 
> > Alexander Shishkin would help out with this. Not sure where that stranded -- I 
> > think in the attempt to make it too generic or so.
> 
> Yep. I can respin it back into perf-specific shape, so do we still want it?

Yeah, please do!

Thanks,

	Ingo