From 71ad88efebbcde374bddf904b96f3a7fc82d45d4 Mon Sep 17 00:00:00 2001 From: Stephane Eranian <eranian@google.com> Date: Tue, 12 Nov 2013 17:58:48 +0100 Subject: 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@google.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: acme@redhat.com Cc: jolsa@redhat.com Cc: zheng.z.yan@intel.com Cc: bp@alien8.de Cc: maria.n.dimakopoulou@gmail.com Link: http://lkml.kernel.org/r/1384275531-10892-2-git-send-email-eranian@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- kernel/events/core.c | 1 + 1 file changed, 1 insertion(+) (limited to 'kernel/events') diff --git a/kernel/events/core.c b/kernel/events/core.c index 72348dc192c1..403b781daafb 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); -- cgit v1.2.3