Fix: check lttng-modules ABI version for RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS support

[lttng-tools.git] / src / bin / lttng-sessiond / main.c

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index e282a9c7699845ae4a15e4a9216fa81f812f9020..b2745086f3860fab9062d5b24ed995d4cfab9325 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -2797,6 +2797,18 @@ static int init_kernel_tracer(void)
                goto error_modules;
        }
 
+       ret = kernel_supports_ring_buffer_snapshot_sample_positions(
+                       kernel_tracer_fd);
+       if (ret < 0) {
+               goto error_modules;
+       }
+
+       if (ret < 1) {
+               WARN("Kernel tracer does not support buffer monitoring. "
+                       "The monitoring timer of channels in the kernel domain "
+                       "will be set to 0 (disabled).");
+       }
+
        DBG("Kernel tracer fd %d", kernel_tracer_fd);
        return 0;