linux-kernel - Re: [PATCH] perf: Introduce function to report unsupported syscall attribute flags

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Date:	Wed, 12 Sep 2012 07:26:38 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Robert Richter <robert.richter@....com>,
	Ingo Molnar <mingo@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: Introduce function to report unsupported syscall attribute flags

Peter Zijlstra <peterz@...radead.org> writes:

> On Wed, 2012-09-12 at 13:01 +0200, Robert Richter wrote:
>> +       if (notsup)
>> +               pr_warn("perf: unsupported attribute flags: %016llx\n", notsup); 
>
> This is a dmesg DoS..
>
> I'm also not sure dmesg is the right way.. could we not somehow change
> the attrs to provide better diagnostic?

Have a output argument for a string, that is then printed by the user tool?

I agree it's a problem today, i usually have to resort to ftrace to
figure out what'swrong.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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