linux-kernel - Re: [PATCH 2/5] perf tool: Initialize events IDs in a single function

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Message-ID: <20111118142255.GB13052@ghostprotocols.net>
Date:	Fri, 18 Nov 2011 12:22:55 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	a.p.zijlstra@...llo.nl, mingo@...e.hu, paulus@...ba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] perf tool: Initialize events IDs in a single
	function

Em Fri, Nov 18, 2011 at 02:46:42PM +0100, Jiri Olsa escreveu:
> Currently events' IDs initialization is scattered among the
> code. Adding function 'perf_evlist__init_ids' to allocate
> and retrive events' IDs in one place.

I'm ok with this one, will merge it in my perf/core branch together with
a fix for a bug I noticed in the original code and that remains with
your changes: consider what happens if we do a second perf_evlist__mmap,
we will call perf_evlist__id_add_fd again and thus bump evsel->ids++
over nr_threads * nr_cpus, overflowing it.

- Arnaldo
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