| Date | Wed, 11 Dec 2013 12:37:15 -0700 | From | David Ahern <> | Subject | Re: [PATCH v0 27/71] perf evlist: Add 'system_wide' option |
| |
On 12/11/13, 5:36 AM, Alexander Shishkin wrote: > From: Adrian Hunter <adrian.hunter@intel.com> > > 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
|