linux-kernel - Re: [tip:perf/urgent] perf symbols: Handle /proc/sys/kernel/kptr

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Message-ID: <20110526213058.GC30593@ghostprotocols.net>
Date:	Thu, 26 May 2011 18:30:58 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, eranian@...gle.com, tzanussi@...il.com,
	penberg@...helsinki.fi, torvalds@...ux-foundation.org,
	efault@....de, peterz@...radead.org, davej@...hat.com,
	davem@...emloft.net, fweisbec@...il.com, kees.cook@...onical.com,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf symbols: Handle
	/proc/sys/kernel/kptr_restrict

Em Thu, May 26, 2011 at 09:39:46PM +0200, Ingo Molnar escreveu:
> 
> * tip-bot for Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> 
> > Commit-ID:  ec80fde746e3ccf93895d25ae1a7071c9af52585
> > Gitweb:     http://git.kernel.org/tip/ec80fde746e3ccf93895d25ae1a7071c9af52585
> > Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
> > AuthorDate: Thu, 26 May 2011 09:53:51 -0300
> > Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
> > CommitDate: Thu, 26 May 2011 11:15:25 -0300
> > 
> > perf symbols: Handle /proc/sys/kernel/kptr_restrict
> 
> Ok, things are much better now with kptr_restrict turned on - but i 
> still see a few rough edges in practice.
> 
> For example 'perf top' says:
> 
>   aldebaran:~/linux> perf top
>   [kernel.kallsyms] with build id 122214021a666675f6e5ff97d70a85ce7139c0e7 not found, continuing without symbols
>   The (null) file can't be used
> 
> Now we've confused the user, havent we? :-)

The ones that do:

# echo -1 > /proc/sys/kernel/perf_event_paranoid

Right?

Trying that, not usually something I do :)

- Arnaldo
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