Commit-ID: 71ad88efebbcde374bddf904b96f3a7fc82d45d4
Gitweb: http://git.kernel.org/tip/71ad88efebbcde374bddf904b96f3a7fc82d45d4
Author: Stephane Eranian <eranian@xxxxxxxxxx>
AuthorDate: Tue, 12 Nov 2013 17:58:48 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 27 Nov 2013 11:16:38 +0100
perf: Add active_entry list head to struct perf_event
This patch adds a new field 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 PMUs 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.
To save space we use a union with hlist_entry as both
are mutually exclusive (suggested by Jiri Olsa).
Signed-off-by: Stephane Eranian <eranian@xxxxxxxxxx>
Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: acme@xxxxxxxxxx
Cc: jolsa@xxxxxxxxxx
Cc: zheng.z.yan@xxxxxxxxx
Cc: bp@xxxxxxxxx
Cc: maria.n.dimakopoulou@xxxxxxxxx
Link: http://lkml.kernel.org/r/1384275531-10892-2-git-send-email-eranian@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
include/linux/perf_event.h | 5 ++++-
kernel/events/core.c | 1 +
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 2e069d1..8f4a70f 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -319,7 +319,10 @@ struct perf_event {
*/
struct list_head migrate_entry;
- struct hlist_node hlist_entry;
+ union {
+ struct hlist_node hlist_entry;
+ struct list_head active_entry;
+ };
int nr_siblings;
int group_flags;
struct perf_event *group_leader;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 72348dc..403b781 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6655,6 +6655,7 @@ 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);
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|