This patch adds a new fields to the struct perf_event.
It is intended to be used to chain events which are
active (enabled). It helps in the hardware layer
for PMU which do not have actual counter restrictions, i.e.,
free running read-only counters. Active events are chained
as opposed to being tracked via the counter they use.
Signed-off-by: Stephane Eranian <eran...@google.com>
---
include/linux/perf_event.h | 1 +
kernel/events/core.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 2e069d1..a376384 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -435,6 +435,7 @@ struct perf_event {
struct perf_cgroup *cgrp; /* cgroup event is attach to */
int cgrp_defer_enabled;
#endif
+ struct list_head active_entry;
#endif /* CONFIG_PERF_EVENTS */
};
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5bd7fe4..6ef9d19 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6629,6 +6629,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
INIT_LIST_HEAD(&event->event_entry);
INIT_LIST_HEAD(&event->sibling_list);
INIT_LIST_HEAD(&event->rb_entry);
+ INIT_LIST_HEAD(&event->active_entry);
init_waitqueue_head(&event->waitq);
init_irq_work(&event->pending, perf_pending_event);
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
