xref: /qemu/tests/qemu-iotests/136 (revision 27a4a30e) 
1#!/usr/bin/env python3
2#
3# Tests for block device statistics
4#
5# Copyright (C) 2015 Igalia, S.L.
6# Author: Alberto Garcia <berto@igalia.com>
7#
8# This program is free software; you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation; either version 2 of the License, or
11# (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with this program.  If not, see <http://www.gnu.org/licenses/>.
20#
21
22import iotests
23import os
24
25interval_length = 10
26nsec_per_sec = 1000000000
27op_latency = nsec_per_sec // 1000 # See qtest_latency_ns in accounting.c
28bad_sector = 8192
29bad_offset = bad_sector * 512
30blkdebug_file = os.path.join(iotests.test_dir, 'blkdebug.conf')
31
32class BlockDeviceStatsTestCase(iotests.QMPTestCase):
33    test_driver = "null-aio"
34    total_rd_bytes = 0
35    total_rd_ops = 0
36    total_wr_bytes = 0
37    total_wr_ops = 0
38    total_wr_merged = 0
39    total_flush_ops = 0
40    failed_rd_ops = 0
41    failed_wr_ops = 0
42    invalid_rd_ops = 0
43    invalid_wr_ops = 0
44    wr_highest_offset = 0
45    account_invalid = False
46    account_failed = False
47
48    def blockstats(self, device):
49        result = self.vm.qmp("query-blockstats")
50        for r in result['return']:
51            if r['device'] == device:
52                return r['stats']
53        raise Exception("Device not found for blockstats: %s" % device)
54
55    def create_blkdebug_file(self):
56        file = open(blkdebug_file, 'w')
57        file.write('''
58[inject-error]
59event = "read_aio"
60errno = "5"
61sector = "%d"
62
63[inject-error]
64event = "write_aio"
65errno = "5"
66sector = "%d"
67''' % (bad_sector, bad_sector))
68        file.close()
69
70    def required_drivers(self):
71        return [self.test_driver]
72
73    @iotests.skip_if_unsupported(required_drivers)
74    def setUp(self):
75        drive_args = []
76        drive_args.append("stats-intervals.0=%d" % interval_length)
77        drive_args.append("stats-account-invalid=%s" %
78                          (self.account_invalid and "on" or "off"))
79        drive_args.append("stats-account-failed=%s" %
80                          (self.account_failed and "on" or "off"))
81        drive_args.append("file.image.read-zeroes=on")
82        self.create_blkdebug_file()
83        self.vm = iotests.VM().add_drive('blkdebug:%s:%s://' %
84                                         (blkdebug_file, self.test_driver),
85                                         ','.join(drive_args))
86        self.vm.launch()
87        # Set an initial value for the clock
88        self.vm.qtest("clock_step %d" % nsec_per_sec)
89
90    def tearDown(self):
91        self.vm.shutdown()
92        os.remove(blkdebug_file)
93
94    def accounted_ops(self, read = False, write = False, flush = False):
95        ops = 0
96        if write:
97            ops += self.total_wr_ops
98            if self.account_failed:
99                ops += self.failed_wr_ops
100            if self.account_invalid:
101                ops += self.invalid_wr_ops
102        if read:
103            ops += self.total_rd_ops
104            if self.account_failed:
105                ops += self.failed_rd_ops
106            if self.account_invalid:
107                ops += self.invalid_rd_ops
108        if flush:
109            ops += self.total_flush_ops
110        return ops
111
112    def accounted_latency(self, read = False, write = False, flush = False):
113        latency = 0
114        if write:
115            latency += self.total_wr_ops * op_latency
116            if self.account_failed:
117                latency += self.failed_wr_ops * op_latency
118        if read:
119            latency += self.total_rd_ops * op_latency
120            if self.account_failed:
121                latency += self.failed_rd_ops * op_latency
122        if flush:
123            latency += self.total_flush_ops * op_latency
124        return latency
125
126    def check_values(self):
127        stats = self.blockstats('drive0')
128
129        # Check that the totals match with what we have calculated
130        self.assertEqual(self.total_rd_bytes, stats['rd_bytes'])
131        self.assertEqual(self.total_wr_bytes, stats['wr_bytes'])
132        self.assertEqual(self.total_rd_ops, stats['rd_operations'])
133        self.assertEqual(self.total_wr_ops, stats['wr_operations'])
134        self.assertEqual(self.total_flush_ops, stats['flush_operations'])
135        self.assertEqual(self.wr_highest_offset, stats['wr_highest_offset'])
136        self.assertEqual(self.failed_rd_ops, stats['failed_rd_operations'])
137        self.assertEqual(self.failed_wr_ops, stats['failed_wr_operations'])
138        self.assertEqual(self.invalid_rd_ops, stats['invalid_rd_operations'])
139        self.assertEqual(self.invalid_wr_ops, stats['invalid_wr_operations'])
140        self.assertEqual(self.account_invalid, stats['account_invalid'])
141        self.assertEqual(self.account_failed, stats['account_failed'])
142        self.assertEqual(self.total_wr_merged, stats['wr_merged'])
143
144        # Check that there's exactly one interval with the length we defined
145        self.assertEqual(1, len(stats['timed_stats']))
146        timed_stats = stats['timed_stats'][0]
147        self.assertEqual(interval_length, timed_stats['interval_length'])
148
149        total_rd_latency = self.accounted_latency(read = True)
150        if (total_rd_latency != 0):
151            self.assertEqual(total_rd_latency, stats['rd_total_time_ns'])
152            self.assertEqual(op_latency, timed_stats['min_rd_latency_ns'])
153            self.assertEqual(op_latency, timed_stats['max_rd_latency_ns'])
154            self.assertEqual(op_latency, timed_stats['avg_rd_latency_ns'])
155            self.assertLess(0, timed_stats['avg_rd_queue_depth'])
156        else:
157            self.assertEqual(0, stats['rd_total_time_ns'])
158            self.assertEqual(0, timed_stats['min_rd_latency_ns'])
159            self.assertEqual(0, timed_stats['max_rd_latency_ns'])
160            self.assertEqual(0, timed_stats['avg_rd_latency_ns'])
161            self.assertEqual(0, timed_stats['avg_rd_queue_depth'])
162
163        # min read latency <= avg read latency <= max read latency
164        self.assertLessEqual(timed_stats['min_rd_latency_ns'],
165                             timed_stats['avg_rd_latency_ns'])
166        self.assertLessEqual(timed_stats['avg_rd_latency_ns'],
167                             timed_stats['max_rd_latency_ns'])
168
169        total_wr_latency = self.accounted_latency(write = True)
170        if (total_wr_latency != 0):
171            self.assertEqual(total_wr_latency, stats['wr_total_time_ns'])
172            self.assertEqual(op_latency, timed_stats['min_wr_latency_ns'])
173            self.assertEqual(op_latency, timed_stats['max_wr_latency_ns'])
174            self.assertEqual(op_latency, timed_stats['avg_wr_latency_ns'])
175            self.assertLess(0, timed_stats['avg_wr_queue_depth'])
176        else:
177            self.assertEqual(0, stats['wr_total_time_ns'])
178            self.assertEqual(0, timed_stats['min_wr_latency_ns'])
179            self.assertEqual(0, timed_stats['max_wr_latency_ns'])
180            self.assertEqual(0, timed_stats['avg_wr_latency_ns'])
181            self.assertEqual(0, timed_stats['avg_wr_queue_depth'])
182
183        # min write latency <= avg write latency <= max write latency
184        self.assertLessEqual(timed_stats['min_wr_latency_ns'],
185                             timed_stats['avg_wr_latency_ns'])
186        self.assertLessEqual(timed_stats['avg_wr_latency_ns'],
187                             timed_stats['max_wr_latency_ns'])
188
189        total_flush_latency = self.accounted_latency(flush = True)
190        if (total_flush_latency != 0):
191            self.assertEqual(total_flush_latency, stats['flush_total_time_ns'])
192            self.assertEqual(op_latency, timed_stats['min_flush_latency_ns'])
193            self.assertEqual(op_latency, timed_stats['max_flush_latency_ns'])
194            self.assertEqual(op_latency, timed_stats['avg_flush_latency_ns'])
195        else:
196            self.assertEqual(0, stats['flush_total_time_ns'])
197            self.assertEqual(0, timed_stats['min_flush_latency_ns'])
198            self.assertEqual(0, timed_stats['max_flush_latency_ns'])
199            self.assertEqual(0, timed_stats['avg_flush_latency_ns'])
200
201        # min flush latency <= avg flush latency <= max flush latency
202        self.assertLessEqual(timed_stats['min_flush_latency_ns'],
203                             timed_stats['avg_flush_latency_ns'])
204        self.assertLessEqual(timed_stats['avg_flush_latency_ns'],
205                             timed_stats['max_flush_latency_ns'])
206
207        # idle_time_ns must be > 0 if we have performed any operation
208        if (self.accounted_ops(read = True, write = True, flush = True) != 0):
209            self.assertLess(0, stats['idle_time_ns'])
210        else:
211            self.assertFalse('idle_time_ns' in stats)
212
213        # This test does not alter these, so they must be all 0
214        self.assertEqual(0, stats['rd_merged'])
215        self.assertEqual(0, stats['failed_flush_operations'])
216        self.assertEqual(0, stats['invalid_flush_operations'])
217
218    def do_test_stats(self, rd_size = 0, rd_ops = 0, wr_size = 0, wr_ops = 0,
219                      flush_ops = 0, invalid_rd_ops = 0, invalid_wr_ops = 0,
220                      failed_rd_ops = 0, failed_wr_ops = 0, wr_merged = 0):
221        # The 'ops' list will contain all the requested I/O operations
222        ops = []
223        for i in range(rd_ops):
224            ops.append("aio_read %d %d" % (i * rd_size, rd_size))
225
226        for i in range(wr_ops):
227            ops.append("aio_write %d %d" % (i * wr_size, wr_size))
228
229        for i in range(flush_ops):
230            ops.append("aio_flush")
231
232        highest_offset = wr_ops * wr_size
233
234        for i in range(invalid_rd_ops):
235            ops.append("aio_read -i 0 512")
236
237        for i in range(invalid_wr_ops):
238            ops.append("aio_write -i 0 512")
239
240        for i in range(failed_rd_ops):
241            ops.append("aio_read %d 512" % bad_offset)
242
243        for i in range(failed_wr_ops):
244            ops.append("aio_write %d 512" % bad_offset)
245
246        # We need an extra aio_flush to settle all outstanding AIO
247        # operations before we can advance the virtual clock, so that
248        # the last access happens before clock_step and idle_time_ns
249        # will be greater than 0
250        extra_flush = 0
251        if rd_ops + wr_ops + invalid_rd_ops + invalid_wr_ops + \
252                failed_rd_ops + failed_wr_ops > 0:
253            extra_flush = 1
254
255        if extra_flush > 0:
256            ops.append("aio_flush")
257
258        if failed_wr_ops > 0:
259            highest_offset = max(highest_offset, bad_offset + 512)
260
261        # Now perform all operations
262        for op in ops:
263            self.vm.hmp_qemu_io("drive0", op)
264
265        # Update the expected totals
266        self.total_rd_bytes += rd_ops * rd_size
267        self.total_rd_ops += rd_ops
268        self.total_wr_bytes += wr_ops * wr_size
269        self.total_wr_ops += wr_ops
270        self.total_wr_merged += wr_merged
271        self.total_flush_ops += flush_ops + extra_flush
272        self.invalid_rd_ops += invalid_rd_ops
273        self.invalid_wr_ops += invalid_wr_ops
274        self.failed_rd_ops += failed_rd_ops
275        self.failed_wr_ops += failed_wr_ops
276
277        self.wr_highest_offset = max(self.wr_highest_offset, highest_offset)
278
279        # Advance the clock so idle_time_ns has a meaningful value
280        self.vm.qtest("clock_step %d" % nsec_per_sec)
281
282        # And check that the actual statistics match the expected ones
283        self.check_values()
284
285    def test_read_only(self):
286        test_values = [[512,    1],
287                       [65536,  1],
288                       [512,   12],
289                       [65536, 12]]
290        for i in test_values:
291            self.do_test_stats(rd_size = i[0], rd_ops = i[1])
292
293    def test_write_only(self):
294        test_values = [[512,    1],
295                       [65536,  1],
296                       [512,   12],
297                       [65536, 12]]
298        for i in test_values:
299            self.do_test_stats(wr_size = i[0], wr_ops = i[1])
300
301    def test_invalid(self):
302        self.do_test_stats(invalid_rd_ops = 7)
303        self.do_test_stats(invalid_wr_ops = 3)
304        self.do_test_stats(invalid_rd_ops = 4, invalid_wr_ops = 5)
305
306    def test_failed(self):
307        self.do_test_stats(failed_rd_ops = 8)
308        self.do_test_stats(failed_wr_ops = 6)
309        self.do_test_stats(failed_rd_ops = 5, failed_wr_ops = 12)
310
311    def test_flush(self):
312        self.do_test_stats(flush_ops = 8)
313
314    def test_all(self):
315        # rd_size, rd_ops, wr_size, wr_ops, flush_ops
316        # invalid_rd_ops,  invalid_wr_ops,
317        # failed_rd_ops,   failed_wr_ops
318        # wr_merged
319        test_values = [[512,    1, 512,   1, 1, 4, 7, 5, 2, 0],
320                       [65536,  1, 2048, 12, 7, 7, 5, 2, 5, 0],
321                       [32768,  9, 8192,  1, 4, 3, 2, 4, 6, 0],
322                       [16384, 11, 3584, 16, 9, 8, 6, 7, 3, 0]]
323        for i in test_values:
324            self.do_test_stats(*i)
325
326    def test_no_op(self):
327        # All values must be sane before doing any I/O
328        self.check_values()
329
330
331class BlockDeviceStatsTestAccountInvalid(BlockDeviceStatsTestCase):
332    account_invalid = True
333    account_failed = False
334
335class BlockDeviceStatsTestAccountFailed(BlockDeviceStatsTestCase):
336    account_invalid = False
337    account_failed = True
338
339class BlockDeviceStatsTestAccountBoth(BlockDeviceStatsTestCase):
340    account_invalid = True
341    account_failed = True
342
343class BlockDeviceStatsTestCoroutine(BlockDeviceStatsTestCase):
344    test_driver = "null-co"
345
346if __name__ == '__main__':
347    if 'null-co' not in iotests.supported_formats():
348        iotests.notrun('null-co driver support missing')
349    iotests.main(supported_fmts=["raw"])
350