SoW-2020-0002: Trace Hit Counters

[deliverable/lttng-modules.git] / src / probes / lttng-kretprobes.c

diff --git a/src/probes/lttng-kretprobes.c b/src/probes/lttng-kretprobes.c
index 24cb52e4af9c6885451cf7d6463a959d45a8207e..b3e9f6272e5a27df400d5d3909beac64cef4f959 100644 (file)
--- a/src/probes/lttng-kretprobes.c
+++ b/src/probes/lttng-kretprobes.c
@@ -43,32 +43,48 @@ int _lttng_kretprobes_handler(struct kretprobe_instance *krpi,
                .event = event,
                .interruptible = !lttng_regs_irqs_disabled(regs),
        };
-       struct lttng_channel *chan = event->chan;
-       struct lib_ring_buffer_ctx ctx;
+       struct lttng_event_container *container = event->container;
        int ret;
        struct {
                unsigned long ip;
                unsigned long parent_ip;
        } payload;
 
-       if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
+       if (unlikely(!LTTNG_READ_ONCE(container->session->active)))
                return 0;
-       if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
+       if (unlikely(!LTTNG_READ_ONCE(container->enabled)))
                return 0;
        if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
                return 0;
 
-       payload.ip = (unsigned long) lttng_get_kretprobe(krpi)->kp.addr;
-       payload.parent_ip = (unsigned long) krpi->ret_addr;
+       switch (container->type) {
+       case LTTNG_EVENT_CONTAINER_CHANNEL:
+       {
+               struct lttng_channel *chan = lttng_event_container_get_channel(container);
+               struct lib_ring_buffer_ctx ctx;
 
-       lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx, sizeof(payload),
-                                lttng_alignof(payload), -1);
-       ret = chan->ops->event_reserve(&ctx, event->id);
-       if (ret < 0)
-               return 0;
-       lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
-       chan->ops->event_write(&ctx, &payload, sizeof(payload));
-       chan->ops->event_commit(&ctx);
+               payload.ip = (unsigned long) lttng_get_kretprobe(krpi)->kp.addr;
+               payload.parent_ip = (unsigned long) krpi->ret_addr;
+
+               lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx, sizeof(payload),
+                                        lttng_alignof(payload), -1);
+               ret = chan->ops->event_reserve(&ctx, event->id);
+               if (ret < 0)
+                       return 0;
+               lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
+               chan->ops->event_write(&ctx, &payload, sizeof(payload));
+               chan->ops->event_commit(&ctx);
+               break;
+       }
+       case LTTNG_EVENT_CONTAINER_COUNTER:
+       {
+               struct lttng_counter *counter = lttng_event_container_get_counter(container);
+               size_t index = event->id;
+
+               (void) counter->ops->counter_add(counter->counter, &index, 1);
+               break;
+       }
+       }
        return 0;
 }