Add testpoints in lttng-sessiond for each threads

This commit adds 8 new testpoints in the lttng-sessiond binary. These
testpoints rely on the testpoints infrastructure introduced recently.

Testpoints:

thread_manage_clients
thread_manage_clients_before_loop
thread_registration_apps
thread_manage_apps
thread_manage_apps_before_loop
thread_manage_kernel
thread_manage_kernel_before_loop
thread_manage_consumer

The thread_<thread_name> testpoints are placed directly at the thread
start and they can be used to trigger failure in <thread_name>.

The thread_<thread_name>_before_loop testpoints are placed directly
before the main processing loop of the thread and thus can be used to
stall the processing of the thread.

Signed-off-by: Christian Babeux <christian.babeux@efficios.com>
Signed-off-by: David Goulet <dgoulet@efficios.com>

diff --git a/src/bin/lttng-sessiond/Makefile.am b/src/bin/lttng-sessiond/Makefile.am
index 73be023024852df9113361f2ad85a3d50320fb8f..b13059d77a155d03a4a13f7cf570e5499c432fbd 100644 (file)
--- a/src/bin/lttng-sessiond/Makefile.am
+++ b/src/bin/lttng-sessiond/Makefile.am
@@ -21,7 +21,8 @@ lttng_sessiond_SOURCES = utils.c utils.h \
                        kernel-consumer.c kernel-consumer.h \
                        consumer.h filter.c filter.h \
                        health.c health.h \
-                       cmd.c cmd.h
+                       cmd.c cmd.h \
+                       testpoint.h
 
 if HAVE_LIBLTTNG_UST_CTL
 lttng_sessiond_SOURCES += trace-ust.c ust-app.c ust-consumer.c ust-consumer.h
@@ -38,7 +39,8 @@ lttng_sessiond_LDADD = -lrt -lurcu-common -lurcu \
                $(top_builddir)/src/common/hashtable/libhashtable.la \
                $(top_builddir)/src/common/libcommon.la \
                $(top_builddir)/src/common/compat/libcompat.la \
-               $(top_builddir)/src/common/relayd/librelayd.la
+               $(top_builddir)/src/common/relayd/librelayd.la \
+               $(top_builddir)/src/common/testpoint/libtestpoint.la
 
 if HAVE_LIBLTTNG_UST_CTL
 lttng_sessiond_LDADD += -llttng-ust-ctl

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 85a20d795cb253123c0b2753a02a8fcad98e8436..1c5623bc3282c980840ff06f361244e8ac2f497b 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -61,6 +61,7 @@
 #include "fd-limit.h"
 #include "filter.h"
 #include "health.h"
+#include "testpoint.h"
 
 #define CONSUMERD_FILE "lttng-consumerd"
 
@@ -688,8 +689,12 @@ static void *thread_manage_kernel(void *data)
 
        DBG("Thread manage kernel started");
 
+       testpoint(thread_manage_kernel);
+
        health_code_update(&health_thread_kernel);
 
+       testpoint(thread_manage_kernel_before_loop);
+
        ret = create_thread_poll_set(&events, 2);
        if (ret < 0) {
                goto error_poll_create;
@@ -860,6 +865,9 @@ static void *thread_manage_consumer(void *data)
        /* Inifinite blocking call, waiting for transmission */
 restart:
        health_poll_update(&consumer_data->health);
+
+       testpoint(thread_manage_consumer);
+
        ret = lttng_poll_wait(&events, -1);
        health_poll_update(&consumer_data->health);
        if (ret < 0) {
@@ -1057,6 +1065,8 @@ static void *thread_manage_apps(void *data)
 
        DBG("[thread] Manage application started");
 
+       testpoint(thread_manage_apps);
+
        rcu_register_thread();
        rcu_thread_online();
 
@@ -1072,6 +1082,8 @@ static void *thread_manage_apps(void *data)
                goto error;
        }
 
+       testpoint(thread_manage_apps_before_loop);
+
        health_code_update(&health_thread_app_manage);
 
        while (1) {
@@ -1295,6 +1307,8 @@ static void *thread_registration_apps(void *data)
 
        DBG("[thread] Manage application registration started");
 
+       testpoint(thread_registration_apps);
+
        ret = lttcomm_listen_unix_sock(apps_sock);
        if (ret < 0) {
                goto error_listen;
@@ -2994,6 +3008,8 @@ static void *thread_manage_clients(void *data)
 
        DBG("[thread] Manage client started");
 
+       testpoint(thread_manage_clients);
+
        rcu_register_thread();
 
        health_code_update(&health_thread_cmd);
@@ -3025,6 +3041,8 @@ static void *thread_manage_clients(void *data)
                kill(ppid, SIGUSR1);
        }
 
+       testpoint(thread_manage_clients_before_loop);
+
        health_code_update(&health_thread_cmd);
 
        while (1) {

diff --git a/src/bin/lttng-sessiond/testpoint.h b/src/bin/lttng-sessiond/testpoint.h
new file mode 100644 (file)
index 0000000..458b0ac
--- /dev/null
+++ b/src/bin/lttng-sessiond/testpoint.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2012 - Christian Babeux <christian.babeux@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef SESSIOND_TESTPOINT_H
+#define SESSIOND_TESTPOINT_H
+
+#include <common/testpoint/testpoint.h>
+
+/* Testpoints, internal use only */
+TESTPOINT_DECL(thread_manage_clients);
+TESTPOINT_DECL(thread_manage_clients_before_loop);
+TESTPOINT_DECL(thread_registration_apps);
+TESTPOINT_DECL(thread_manage_apps);
+TESTPOINT_DECL(thread_manage_apps_before_loop);
+TESTPOINT_DECL(thread_manage_kernel);
+TESTPOINT_DECL(thread_manage_kernel_before_loop);
+TESTPOINT_DECL(thread_manage_consumer);
+
+#endif /* SESSIOND_TESTPOINT_H */