linux-kernel - Re: [RFC 00/13] perf_env/CPU socket reorg/fixes

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Date:	Fri, 11 Sep 2015 10:30:52 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Kan Liang <kan.liang@...el.com>, Ingo Molnar <mingo@...nel.org>,
	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC 00/13] perf_env/CPU socket reorg/fixes

Em Fri, Sep 11, 2015 at 10:29:37AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Sep 11, 2015 at 10:03:39AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Fri, Sep 11, 2015 at 08:20:54PM +0800, Wangnan (F) escreveu:
> > > I have tested patch 1 to 10. They looks good to me except patch 4/13. Please
> > 
> > Ok, I'll take that as a Tested-by: you for 1-10 with 4/13 having the
> > checks added, ok?
>  
> > > see my email in that thread.
>  
> > I add those checks.
> 
> Ok, below is the diff for adding the checks. The get_{core,socket}_id
> functions should be moved to tools/lib/api/cpu.[ch], using the same
> interface as cpu__get_max_freq(&value), using the int return value to
> propagate the precise error, etc. Will do it in a follow up patch.

Humm, but then, what happens if a CPU is offline? I'm checking it now...

- Arnaldo
 
> - Arnaldo
> 
> diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
> index 6af4f7c36820..2e4cad84197b 100644
> --- a/tools/perf/util/env.c
> +++ b/tools/perf/util/env.c
> @@ -60,7 +60,7 @@ out_enomem:
>  
>  int perf_env__read_cpu_topology_map(struct perf_env *env)
>  {
> -	int cpu, nr_cpus;
> +	int cpu, nr_cpus, err;
>  
>  	if (env->cpu != NULL)
>  		return 0;
> @@ -77,10 +77,17 @@ int perf_env__read_cpu_topology_map(struct perf_env *env)
>  		return -ENOMEM;
>  
>  	for (cpu = 0; cpu < nr_cpus; ++cpu) {
> -		env->cpu[cpu].core_id	= cpu_map__get_core_id(cpu);
> -		env->cpu[cpu].socket_id	= cpu_map__get_socket_id(cpu);
> +		err = env->cpu[cpu].core_id = cpu_map__get_core_id(cpu);
> +		if (err < 0)
> +			goto out_free;
> +		err = env->cpu[cpu].socket_id = cpu_map__get_socket_id(cpu);
> +		if (err < 0)
> +			goto out_free;
>  	}
>  
> -	env->nr_cpus_avail = nr_cpus;
>  	return 0;
> +
> +out_free:
> +	zfree(&env->cpu);
> +	return err;
>  }
--
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