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-rwxr-xr-xsrc/seastar/debug/task-latency.stap24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/seastar/debug/task-latency.stap b/src/seastar/debug/task-latency.stap
new file mode 100755
index 000000000..066109823
--- /dev/null
+++ b/src/seastar/debug/task-latency.stap
@@ -0,0 +1,24 @@
+#!/usr/bin/stap
+
+# usage: task_latency.stap process_name latency_threshold_ms
+
+global start_time
+
+probe process(@1).mark("reactor_run_tasks_single_start") {
+ start_time[tid()] = gettimeofday_us()
+}
+
+probe process(@1).mark("reactor_run_tasks_single_end") {
+ delete start_time[tid()]
+}
+
+probe timer.profile {
+ if ([tid()] in start_time) {
+ now = gettimeofday_us()
+ start = start_time[tid()]
+ if ((now - start) > $2 * 1000) {
+ printf("detected tasks running for >%sms\n", @2)
+ print_usyms(ubacktrace())
+ }
+ }
+}