Peter Zijlstra <[email protected]> writes: > On Wed, Aug 20, 2014 at 03:36:03PM +0300, Alexander Shishkin wrote: >> In order to collect AUX data from an inherited event, we can redirect its >> output to parent's ring buffer if possible (they must be cpu affine). This >> patch adds set_output() to the inheritance path. >> >> Signed-off-by: Alexander Shishkin <[email protected]> >> --- >> kernel/events/core.c | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/kernel/events/core.c b/kernel/events/core.c >> index 67f857ab56..e36478564c 100644 >> --- a/kernel/events/core.c >> +++ b/kernel/events/core.c >> @@ -7962,6 +7962,12 @@ inherit_event(struct perf_event *parent_event, >> = parent_event->overflow_handler_context; >> >> /* >> + * Direct child's output to parent's ring buffer (if any) >> + */ >> + if (parent_event->cpu != -1) >> + (void)perf_event_set_output(child_event, parent_event); >> + >> + /* >> * Precalculate sample_data sizes >> */ >> perf_event__header_size(child_event); > > Uhm, nope, see perf_output_begin(), it always redirects output to parent > events.
Ouch, indeed. We'll just do the same in perf_aux_output_begin(). Regards, -- Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
