Commit-ID: 71ad88efebbcde374bddf904b96f3a7fc82d45d4 Gitweb: http://git.kernel.org/tip/71ad88efebbcde374bddf904b96f3a7fc82d45d4 Author: Stephane Eranian <[email protected]> AuthorDate: Tue, 12 Nov 2013 17:58:48 +0100 Committer: Ingo Molnar <[email protected]> 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 <[email protected]> Reviewed-by: Andi Kleen <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- 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-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/
