linux-kernel - Re: [patch] perf tools: perf list broken on ARM

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Message-ID: <874n6hjnrw.fsf@sejong.aot.lge.com>
Date:	Tue, 10 Dec 2013 14:08:51 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	linux-kernel@...r.kernel.org,
	Chad Paradis <chad.paradis@...t.maine.edu>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [patch] perf tools: perf list broken on ARM

On Mon, 9 Dec 2013 22:58:46 -0500 (EST), Vince Weaver wrote:
> On Tue, 10 Dec 2013, Namhyung Kim wrote:
>
>> Hi Vince,
>> Okay, the reason I set the bit was consideration of a very strict
>> perf_event_paranoid setting (-2).
>> 
>> So maybe we can try it again with the bit cleared after a failure, or
>> checking the paranoid setting first.
>
> If perf_event_paranoid is set to 2 then you should get EPERM rather than 
> ENOENT or EINVAL, right?  Maybe that could be used too.

Ah, yes, it's 2. :)  And it also can use the return value then.

>
> As a side note, why doesn't paranoid 2 block events that don't have
> exclude_hv set?

Hmm.. maybe because it predated the bit?

Thanks,
Namhyung
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