Re: [PATCH v0 27/71] perf evlist: Add 'system_wide' option

[David Ahern]

On 12/11/13, 5:36 AM, Alexander Shishkin wrote:
> From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
>
> Add an option to cause a selected event
> to be opened always without a pid when
> configured by perf_evsel__config().
>
> This is needed when using the sched_switch
> tracepoint to follow object code execution.
> sched_switch occurs before the task
> switch and so it cannot record it in a
> context limited to that task.  Note
> that also means that sched_switch is
> useless when capturing data per-thread,
> as is the 'context-switches' software
> event for the same reason.

This seems like a tailored solution for what is really a generic 
problem: you need events to have different attributes -- a mix of system 
wide, task based, with or without callchains and other sample options.

David
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