linux-kernel - Re: [PATCH -tip v2 1/8] [BUGFIX] perf-probe: Fix to do exit call for symbol maps

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Date:	Mon, 03 Feb 2014 16:41:43 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	"Steven Rostedt \(Red Hat\)" <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	"David A. Long" <dave.long@...aro.org>,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH -tip v2 1/8] [BUGFIX] perf-probe: Fix to do exit call for symbol maps

Hi Masami,

On Wed, 29 Jan 2014 09:14:52 +0000, Masami Hiramatsu wrote:
> Some perf-probe commands do symbol_init() but doesn't
> do exit call. This fixes that to call symbol_exit()
> and relase machine if needed.
> This also merges init_vmlinux() and init_user_exec()
> because both of them are doing similar things.
> (init_user_exec() just skips init vmlinux related
>  symbol maps)
>
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> ---
>  tools/perf/util/probe-event.c |  110 +++++++++++++++++++++++------------------
>  1 file changed, 61 insertions(+), 49 deletions(-)
>
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index a8a9b6c..14c649df 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -73,31 +73,35 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
>  static int convert_name_to_addr(struct perf_probe_event *pev,
>  				const char *exec);
>  static void clear_probe_trace_event(struct probe_trace_event *tev);
> -static struct machine machine;
> +static struct machine *host_machine;
>  
>  /* Initialize symbol maps and path of vmlinux/modules */
> -static int init_vmlinux(void)
> +static int init_symbol_maps(bool user_only)
>  {
>  	int ret;
>  
>  	symbol_conf.sort_by_name = true;
> -	if (symbol_conf.vmlinux_name == NULL)
> -		symbol_conf.try_vmlinux_path = true;
> -	else
> -		pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
> +	if (user_only)
> +		symbol_conf.try_vmlinux_path = false;
> +	else {
> +		if (symbol_conf.vmlinux_name == NULL)
> +			symbol_conf.try_vmlinux_path = true;

This looks unnecessary and duplicate since we already have following
code in __cmd_probe().

	/*
	 * Only consider the user's kernel image path if given.
	 */
	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);

Thanks,
Namhyung


> +		else
> +			pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
> +	}
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