Since inherited events are part of the same cqm cache group, they share the RMID and therefore they cannot provide the granularity required by inherit_stats. Changing this would require to create a subtree of monrs for each parent event and its inherited events, a potential improvement for future patches.
Reviewed-by: Stephane Eranian <[email protected]> Signed-off-by: David Carrillo-Cisneros <[email protected]> --- arch/x86/events/intel/cqm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/events/intel/cqm.c b/arch/x86/events/intel/cqm.c index d8d3191..6e85021 100644 --- a/arch/x86/events/intel/cqm.c +++ b/arch/x86/events/intel/cqm.c @@ -2483,6 +2483,7 @@ static int intel_cqm_event_init(struct perf_event *event) event->attr.exclude_idle || event->attr.exclude_host || event->attr.exclude_guest || + event->attr.inherit_stat || /* cqm groups share rmid */ event->attr.sample_period) /* no sampling */ return -EINVAL; -- 2.8.0.rc3.226.g39d4020
