diff --git a/include/types/global.h b/include/types/global.h
index 5c5cf73..bd7761c 100644
--- a/include/types/global.h
+++ b/include/types/global.h
@@ -173,7 +173,34 @@
 #endif
 };
 
+/* per-thread activity reports. It's important that it's aligned on cache lines
+ * because some elements will be updated very often. Most counters are OK on
+ * 32-bit since this will be used during debugging sessions for troubleshooting
+ * in iterative mode.
+ */
+struct activity {
+	unsigned int loops;        // complete loops in run_poll_loop()
+	unsigned int wake_cache;   // active fd_cache prevented poll() from sleeping
+	unsigned int wake_tasks;   // active tasks prevented poll() from sleeping
+	unsigned int wake_applets; // active applets prevented poll() from sleeping
+	unsigned int wake_signal;  // pending signal prevented poll() from sleeping
+	unsigned int poll_exp;     // number of times poll() sees an expired timeout (includes wake_*)
+	unsigned int poll_drop;    // poller dropped a dead FD from the update list
+	unsigned int poll_dead;    // poller woke up with a dead FD
+	unsigned int poll_skip;    // poller skipped another thread's FD
+	unsigned int fd_skip;      // fd cache skipped another thread's FD
+	unsigned int fd_lock;      // fd cache skipped a locked FD
+	unsigned int fd_del;       // fd cache detected a deleted FD
+	unsigned int conn_dead;    // conn_fd_handler woke up on an FD indicating a dead connection
+	unsigned int stream;       // calls to process_stream()
+	unsigned int empty_rq;     // calls to process_runnable_tasks() with nothing for the thread
+	unsigned int long_rq;      // process_runnable_tasks() left with tasks in the run queue
+	char __pad[0]; // unused except to check remaining room
+	char __end[0] __attribute__((aligned(64))); // align size to 64.
+};
+
 extern struct global global;
+extern struct activity activity[MAX_THREADS];
 extern int  pid;                /* current process id */
 extern int  relative_pid;       /* process id starting at 1 */
 extern unsigned long pid_bit;   /* bit corresponding to the process id */