linux-kernel - Re: [PATCH] perf: fix core dump

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Message-ID: <20100824122525.GM2973@ghostprotocols.net>
Date:	Tue, 24 Aug 2010 09:25:25 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	jovi zhang <bookjovi@...il.com>
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: fix core dump

Em Tue, Aug 24, 2010 at 03:07:33PM +0800, jovi zhang escreveu:
> Perf invoke symbol__init function twice when we input command "perf
> kmem/sched record ls", then it will core dump when symbol__exit
> invoked.
> So give a flag to make symbol__init can be invoked once.

Yeah, this fixes the problem, and I'll apply this patch, but I think
that the elegant solution is to adopt one more kernel construct, i.e.
__init markings :)

Thanks!

- Arnaldo
 
> Signed-off-by: Jovi Zhang <bookjovi@...il.com>
> tools/perf/util/symbol.c |    9 +++++++++
> 1 files changed, 9 insertions(+), 0 deletions(-)
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 1a36773..aded121 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -43,6 +43,8 @@ struct symbol_conf symbol_conf = {
>        .try_vmlinux_path = true,
> };
> 
> +static bool symbol_initizated;
> +
> int dso__name_len(const struct dso *self)
> {
>        if (verbose)
> @@ -2268,6 +2270,11 @@ static int setup_list(struct strlist **list,
> const char *list_str,
> 
> int symbol__init(void)
> {
> +       if (symbol_initizated == true)
> +               return 0;
> +       else
> +               symbol_initizated = true;
> +
>        elf_version(EV_CURRENT);
>        if (symbol_conf.sort_by_name)
>                symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
> @@ -2304,6 +2311,8 @@ out_free_comm_list:
> 
> void symbol__exit(void)
> {
> +       if (symbol_initizated == false)
> +               return;
>        strlist__delete(symbol_conf.sym_list);
>        strlist__delete(symbol_conf.dso_list);
>        strlist__delete(symbol_conf.comm_list);
--
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