linux-kernel - Re: [PATCHv2] perf: Fix vmalloc ring buffer free function

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Message-ID: <20130311180229.GI13679@krava.brq.redhat.com>
Date:	Mon, 11 Mar 2013 19:02:30 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCHv2] perf: Fix vmalloc ring buffer free function

On Mon, Mar 11, 2013 at 06:44:45PM +0100, Peter Zijlstra wrote:
> On Mon, 2013-03-11 at 17:43 +0100, Jiri Olsa wrote:
> 
> > I did not know there were other plans for that, seemed useless
> 
> I like to keep form, confuses me less :-)

ook

> 
> Anyway, why are we getting to that part of perf_output_begin() if we
> don't have any data pages to begin with? Shouldn't we bail before there
> someplace? Like at the !rb->nr_pages check?
> 

perf_output_begin actually does the !rb->nr_pages check
looks like we could check it earlier in some casese, I'll
update my todo list ;-)

jirka
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