1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
#!/bin/bash
#
# SPDX-FileCopyrightText: 2015 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
# SPDX-FileCopyrightText: 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
# SPDX-FileCopyrightText: 2025 Michael Jeanson <mjeanson@efficios.com>
#
# SPDX-License-Identifier: LGPL-2.1-only
TEST_DESC="UST - Blocking mode"
CURDIR=$(dirname "$0")/
TESTDIR=$CURDIR/../../..
SESSION_NAME="blocking"
CHANNEL_NAME="testchan"
TESTAPP_PATH="$TESTDIR/utils/testapp"
TESTAPP_NAME="gen-ust-events"
TESTAPP_BIN="$TESTAPP_PATH/$TESTAPP_NAME"
EVENT_NAME="tp:tptest"
NUM_TESTS=50
# shellcheck source-path=SCRIPTDIR/../../..
source "$TESTDIR/utils/utils.sh"
# MUST set TESTDIR before calling those functions
# Run app on a single CPU to ensure we only write in a single ring buffer.
function run_app()
{
local num_event=$1
retry_anycpu_taskset "$TESTAPP_BIN" -i "$num_event"
ok $? "Application done"
}
function check_disk_space()
{
local path
path="${1:?}"
kb_free=$(df -k -P "${path}" | tail -n 1 | awk '{ print $4 }')
if [ "${kb_free}" -lt "1048576" ] ; then
return 1
fi
return 0
}
function test_ust_implicit_no_blocking()
{
local num_event=5000000
local trace_path
diag "UST implicit non-blocking mode (default): will hang if fails"
trace_path=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
start_lttng_sessiond
# session in no-output mode
create_lttng_session_no_output $SESSION_NAME
enable_ust_lttng_event_ok $SESSION_NAME "$EVENT_NAME"
start_lttng_tracing_ok $SESSION_NAME
run_app "$num_event"
stop_lttng_tracing_ok $SESSION_NAME
destroy_lttng_session_ok $SESSION_NAME
stop_lttng_sessiond
pass "Does not hang"
rm -rf "$trace_path"
}
function test_ust_implicit_no_blocking_with_channel_blocking()
{
local num_event=5000000
local trace_path
diag "UST implicit non-blocking mode (default) with blocking-timeout=inf channel: will hang if fails"
trace_path=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
start_lttng_sessiond
# session in no-output mode
create_lttng_session_no_output $SESSION_NAME
enable_ust_lttng_channel_ok $SESSION_NAME $CHANNEL_NAME "--blocking-timeout=inf"
enable_ust_lttng_event_ok $SESSION_NAME "$EVENT_NAME" $CHANNEL_NAME
start_lttng_tracing_ok $SESSION_NAME
run_app "$num_event"
stop_lttng_tracing_ok $SESSION_NAME
destroy_lttng_session_ok $SESSION_NAME
stop_lttng_sessiond
pass "Does not hang"
rm -rf "$trace_path"
}
function test_ust_timeout_no_blocking()
{
local num_event=12500
local trace_path
diag "UST 1ms timeout blocking mode: will hang if fails"
trace_path=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
start_lttng_sessiond
# session in no-output mode
create_lttng_session_no_output $SESSION_NAME
# blocking timeout 1ms
enable_ust_lttng_channel_ok $SESSION_NAME $CHANNEL_NAME "--blocking-timeout=1000"
enable_ust_lttng_event_ok $SESSION_NAME "$EVENT_NAME" $CHANNEL_NAME
start_lttng_tracing_ok $SESSION_NAME
LTTNG_UST_ALLOW_BLOCKING=1 run_app "$num_event"
stop_lttng_tracing_ok $SESSION_NAME
destroy_lttng_session_ok $SESSION_NAME
stop_lttng_sessiond
pass "Does not hang"
rm -rf "$trace_path"
}
function test_ust_snapshot_no_blocking()
{
local num_event=5000000
local trace_path
diag "UST blocking mode: don't block in snapshot mode"
trace_path=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
# Test without the plugin
start_lttng_sessiond
create_lttng_session_ok $SESSION_NAME "$trace_path" --snapshot
# blocking timeout 1ms
enable_ust_lttng_channel_ok $SESSION_NAME $CHANNEL_NAME "--blocking-timeout=1000"
enable_ust_lttng_event_ok $SESSION_NAME "$EVENT_NAME" $CHANNEL_NAME
start_lttng_tracing_ok $SESSION_NAME
LTTNG_UST_ALLOW_BLOCKING=1 run_app "$num_event"
stop_lttng_tracing_ok $SESSION_NAME
destroy_lttng_session_ok $SESSION_NAME
stop_lttng_sessiond
pass "Does not hang"
rm -rf "$trace_path"
}
function test_ust_blocking_no_discard()
{
local num_event=5000000
local trace_path
local mi_output_file
local discarded
diag "UST blocking mode: no event discarded"
trace_path=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
mi_output_file=$(mktemp -t "tmp.${FUNCNAME[0]}_output_file.XXXXXX")
# Test without the plugin
start_lttng_sessiond
create_lttng_session_ok $SESSION_NAME "$trace_path"
# infinite blocking timeout
enable_ust_lttng_channel_ok $SESSION_NAME $CHANNEL_NAME "--blocking-timeout=inf"
enable_ust_lttng_event_ok $SESSION_NAME "$EVENT_NAME" $CHANNEL_NAME
start_lttng_tracing_ok $SESSION_NAME
LTTNG_UST_ALLOW_BLOCKING=1 run_app "$num_event"
stop_lttng_tracing_ok $SESSION_NAME
LTTNG_TEST_MI_CLIENT=1 OUTPUT_DEST="$mi_output_file" list_lttng_ok "${SESSION_NAME}" -c "${CHANNEL_NAME}"
destroy_lttng_session_ok $SESSION_NAME
stop_lttng_sessiond
discarded=$("${XML_EXTRACT}" "$mi_output_file" '//lttng:command/lttng:output/lttng:sessions/lttng:session/lttng:domains/lttng:domain/lttng:channels/lttng:channel/lttng:attributes/lttng:discarded_events')
is "$discarded" 0 "No event lost with UST blocking mode: ${discarded}"
rm -f "$mi_output_file"
rm -rf "$trace_path"
}
plan_tests $NUM_TESTS
print_test_banner "$TEST_DESC"
bail_out_if_no_babeltrace
if ! check_disk_space "${TMPDIR:-/tmp}"; then
BAIL_OUT "Not enough free space to run blocking tests"
fi
test_ust_implicit_no_blocking
test_ust_implicit_no_blocking_with_channel_blocking
test_ust_timeout_no_blocking
test_ust_snapshot_no_blocking
test_ust_blocking_no_discard
|
