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authorStephane Eranian <eranian@google.com>2013-11-12 17:58:48 +0100
committerIngo Molnar <mingo@kernel.org>2013-11-27 11:16:38 +0100
commit71ad88efebbcde374bddf904b96f3a7fc82d45d4 (patch)
treed6bb2d225ad6dfc1e70fe1c1f5686d8c4228b09f /kernel/events
parent09897d78dbc3a544426f2272b5601c62922ccab9 (diff)
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>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c1
1 files changed, 1 insertions, 0 deletions
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);