Re: [PATCH V2 15/15] perf tools: fix ppid in thread__fork()

[David Ahern]

On 6/27/13 1:55 AM, Adrian Hunter wrote:
> ppid should be assigned to the parents pid.  Note
> 'thread__fork()'s only caller 'machine__process_fork_event()'
> ensures that the parents pid is set.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
>   tools/perf/util/thread.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
> index e3d4a55..93f3eab 100644
> --- a/tools/perf/util/thread.c
> +++ b/tools/perf/util/thread.c
> @@ -85,7 +85,7 @@ int thread__fork(struct thread *self, struct thread *parent)
>   		if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
>   			return -ENOMEM;
>
> -	self->ppid = parent->tid;
> +	self->ppid = parent->pid_;

knowledge of the specific thread within the parent that created the 
process can be valuable -- that's what we get now. This change drops 
that information. I'd prefer this stays at thread id -- or save the 
parent thread id in addition to the pid.

David
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