Re: [PATCH] perf tools: Allow multiple cpus record for -p option

From: Namhyung Kim
Date: Tue Nov 05 2013 - 02:38:28 EST


On Fri, 1 Nov 2013 16:52:45 +0100, Jiri Olsa wrote:
> Currently we don't create default CPU map for task related
> target, like:
>
> $ perf record -p <pid>
>
> This makes record command to disable inherited events.
> which is not desired behaviour (we have special option
> for that (-i) anyway).
>
> Fixing this by creating default CPU map for task related
> processes.
>
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
> Cc: David Ahern <dsahern@xxxxxxxxx>
> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxx>
> Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
> Cc: Paul Mackerras <paulus@xxxxxxxxx>
> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> ---
> tools/perf/util/evlist.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 0582f67..52bb127 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -804,7 +804,7 @@ int perf_evlist__create_maps(struct perf_evlist *evlist,
> return -1;
>
> if (perf_target__has_task(target))
> - evlist->cpus = cpu_map__dummy_new();
> + evlist->cpus = cpu_map__new(target->cpu_list);

Just a side note, if the target has task, the cpu list should be NULL as
task target has a precedence. Please see perf_target__validate().

But I'm fine with the change itself. :)

Thanks,
Namhyung


> else if (!perf_target__has_cpu(target) && !target->uses_mmap)
> evlist->cpus = cpu_map__dummy_new();
> else
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