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SubjectRe: [PATCH 4/4][RFC] perf_counter: Allow sharing of output channels
On Wed, Aug 19, 2009 at 11:18:27AM +0200, Peter Zijlstra wrote:
> Provide the ability to configure a counter to send its output to
> another (already existing) counter's output stream.
>
> [ compile tested only ]
>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Cc: stephane eranian <eranian@googlemail.com>
> +int perf_counter_set_output(struct perf_counter *counter, int output_fd)
> +{
> + struct perf_counter *output_counter = NULL;
> + struct file *output_file = NULL;
> + struct perf_counter *old_output;
> + int fput_needed = 0;
> + int ret = -EINVAL;
> +
> + if (!output_fd)
> + goto set;
> +
> + output_file = fget_light(output_fd, &fput_needed);
> + if (!output_file)
> + return -EBADF;
> +
> + if (output_file->f_op != &perf_fops)
> + goto out;
> +
> + output_counter = output_file->private_data;
> +
> + /* Don't chain output fds */
> + if (output_counter->output)
> + goto out;



If you don't chain them, how do you propagate more than one
path of output redirected?



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