xref: /qemu/tests/qemu-iotests/136 (revision fc7d2b45) 
1#!/usr/bin/env python
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_img = "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 setUp(self):
71        drive_args = []
72        drive_args.append("stats-intervals.0=%d" % interval_length)
73        drive_args.append("stats-account-invalid=%s" %
74                          (self.account_invalid and "on" or "off"))
75        drive_args.append("stats-account-failed=%s" %
76                          (self.account_failed and "on" or "off"))
77        drive_args.append("file.image.read-zeroes=on")
78        self.create_blkdebug_file()
79        self.vm = iotests.VM().add_drive('blkdebug:%s:%s' %
80                                         (blkdebug_file, self.test_img),
81                                         ','.join(drive_args))
82        self.vm.launch()
83        # Set an initial value for the clock
84        self.vm.qtest("clock_step %d" % nsec_per_sec)
85
86    def tearDown(self):
87        self.vm.shutdown()
88        os.remove(blkdebug_file)
89
90    def accounted_ops(self, read = False, write = False, flush = False):
91        ops = 0
92        if write:
93            ops += self.total_wr_ops
94            if self.account_failed:
95                ops += self.failed_wr_ops
96            if self.account_invalid:
97                ops += self.invalid_wr_ops
98        if read:
99            ops += self.total_rd_ops
100            if self.account_failed:
101                ops += self.failed_rd_ops
102            if self.account_invalid:
103                ops += self.invalid_rd_ops
104        if flush:
105            ops += self.total_flush_ops
106        return ops
107
108    def accounted_latency(self, read = False, write = False, flush = False):
109        latency = 0
110        if write:
111            latency += self.total_wr_ops * op_latency
112            if self.account_failed:
113                latency += self.failed_wr_ops * op_latency
114        if read:
115            latency += self.total_rd_ops * op_latency
116            if self.account_failed:
117                latency += self.failed_rd_ops * op_latency
118        if flush:
119            latency += self.total_flush_ops * op_latency
120        return latency
121
122    def check_values(self):
123        stats = self.blockstats('drive0')
124
125        # Check that the totals match with what we have calculated
126        self.assertEqual(self.total_rd_bytes, stats['rd_bytes'])
127        self.assertEqual(self.total_wr_bytes, stats['wr_bytes'])
128        self.assertEqual(self.total_rd_ops, stats['rd_operations'])
129        self.assertEqual(self.total_wr_ops, stats['wr_operations'])
130        self.assertEqual(self.total_flush_ops, stats['flush_operations'])
131        self.assertEqual(self.wr_highest_offset, stats['wr_highest_offset'])
132        self.assertEqual(self.failed_rd_ops, stats['failed_rd_operations'])
133        self.assertEqual(self.failed_wr_ops, stats['failed_wr_operations'])
134        self.assertEqual(self.invalid_rd_ops, stats['invalid_rd_operations'])
135        self.assertEqual(self.invalid_wr_ops, stats['invalid_wr_operations'])
136        self.assertEqual(self.account_invalid, stats['account_invalid'])
137        self.assertEqual(self.account_failed, stats['account_failed'])
138        self.assertEqual(self.total_wr_merged, stats['wr_merged'])
139
140        # Check that there's exactly one interval with the length we defined
141        self.assertEqual(1, len(stats['timed_stats']))
142        timed_stats = stats['timed_stats'][0]
143        self.assertEqual(interval_length, timed_stats['interval_length'])
144
145        total_rd_latency = self.accounted_latency(read = True)
146        if (total_rd_latency != 0):
147            self.assertEqual(total_rd_latency, stats['rd_total_time_ns'])
148            self.assertEqual(op_latency, timed_stats['min_rd_latency_ns'])
149            self.assertEqual(op_latency, timed_stats['max_rd_latency_ns'])
150            self.assertEqual(op_latency, timed_stats['avg_rd_latency_ns'])
151            self.assertLess(0, timed_stats['avg_rd_queue_depth'])
152        else:
153            self.assertEqual(0, stats['rd_total_time_ns'])
154            self.assertEqual(0, timed_stats['min_rd_latency_ns'])
155            self.assertEqual(0, timed_stats['max_rd_latency_ns'])
156            self.assertEqual(0, timed_stats['avg_rd_latency_ns'])
157            self.assertEqual(0, timed_stats['avg_rd_queue_depth'])
158
159        # min read latency <= avg read latency <= max read latency
160        self.assertLessEqual(timed_stats['min_rd_latency_ns'],
161                             timed_stats['avg_rd_latency_ns'])
162        self.assertLessEqual(timed_stats['avg_rd_latency_ns'],
163                             timed_stats['max_rd_latency_ns'])
164
165        total_wr_latency = self.accounted_latency(write = True)
166        if (total_wr_latency != 0):
167            self.assertEqual(total_wr_latency, stats['wr_total_time_ns'])
168            self.assertEqual(op_latency, timed_stats['min_wr_latency_ns'])
169            self.assertEqual(op_latency, timed_stats['max_wr_latency_ns'])
170            self.assertEqual(op_latency, timed_stats['avg_wr_latency_ns'])
171            self.assertLess(0, timed_stats['avg_wr_queue_depth'])
172        else:
173            self.assertEqual(0, stats['wr_total_time_ns'])
174            self.assertEqual(0, timed_stats['min_wr_latency_ns'])
175            self.assertEqual(0, timed_stats['max_wr_latency_ns'])
176            self.assertEqual(0, timed_stats['avg_wr_latency_ns'])
177            self.assertEqual(0, timed_stats['avg_wr_queue_depth'])
178
179        # min write latency <= avg write latency <= max write latency
180        self.assertLessEqual(timed_stats['min_wr_latency_ns'],
181                             timed_stats['avg_wr_latency_ns'])
182        self.assertLessEqual(timed_stats['avg_wr_latency_ns'],
183                             timed_stats['max_wr_latency_ns'])
184
185        total_flush_latency = self.accounted_latency(flush = True)
186        if (total_flush_latency != 0):
187            self.assertEqual(total_flush_latency, stats['flush_total_time_ns'])
188            self.assertEqual(op_latency, timed_stats['min_flush_latency_ns'])
189            self.assertEqual(op_latency, timed_stats['max_flush_latency_ns'])
190            self.assertEqual(op_latency, timed_stats['avg_flush_latency_ns'])
191        else:
192            self.assertEqual(0, stats['flush_total_time_ns'])
193            self.assertEqual(0, timed_stats['min_flush_latency_ns'])
194            self.assertEqual(0, timed_stats['max_flush_latency_ns'])
195            self.assertEqual(0, timed_stats['avg_flush_latency_ns'])
196
197        # min flush latency <= avg flush latency <= max flush latency
198        self.assertLessEqual(timed_stats['min_flush_latency_ns'],
199                             timed_stats['avg_flush_latency_ns'])
200        self.assertLessEqual(timed_stats['avg_flush_latency_ns'],
201                             timed_stats['max_flush_latency_ns'])
202
203        # idle_time_ns must be > 0 if we have performed any operation
204        if (self.accounted_ops(read = True, write = True, flush = True) != 0):
205            self.assertLess(0, stats['idle_time_ns'])
206        else:
207            self.assertFalse('idle_time_ns' in stats)
208
209        # This test does not alter these, so they must be all 0
210        self.assertEqual(0, stats['rd_merged'])
211        self.assertEqual(0, stats['failed_flush_operations'])
212        self.assertEqual(0, stats['invalid_flush_operations'])
213
214    def do_test_stats(self, rd_size = 0, rd_ops = 0, wr_size = 0, wr_ops = 0,
215                      flush_ops = 0, invalid_rd_ops = 0, invalid_wr_ops = 0,
216                      failed_rd_ops = 0, failed_wr_ops = 0, wr_merged = 0):
217        # The 'ops' list will contain all the requested I/O operations
218        ops = []
219        for i in range(rd_ops):
220            ops.append("aio_read %d %d" % (i * rd_size, rd_size))
221
222        for i in range(wr_ops):
223            ops.append("aio_write %d %d" % (i * wr_size, wr_size))
224
225        for i in range(flush_ops):
226            ops.append("aio_flush")
227
228        highest_offset = wr_ops * wr_size
229
230        for i in range(invalid_rd_ops):
231            ops.append("aio_read -i 0 512")
232
233        for i in range(invalid_wr_ops):
234            ops.append("aio_write -i 0 512")
235
236        for i in range(failed_rd_ops):
237            ops.append("aio_read %d 512" % bad_offset)
238
239        for i in range(failed_wr_ops):
240            ops.append("aio_write %d 512" % bad_offset)
241
242        # We need an extra aio_flush to settle all outstanding AIO
243        # operations before we can advance the virtual clock, so that
244        # the last access happens before clock_step and idle_time_ns
245        # will be greater than 0
246        extra_flush = 0
247        if rd_ops + wr_ops + invalid_rd_ops + invalid_wr_ops + \
248                failed_rd_ops + failed_wr_ops > 0:
249            extra_flush = 1
250
251        if extra_flush > 0:
252            ops.append("aio_flush")
253
254        if failed_wr_ops > 0:
255            highest_offset = max(highest_offset, bad_offset + 512)
256
257        # Now perform all operations
258        for op in ops:
259            self.vm.hmp_qemu_io("drive0", op)
260
261        # Update the expected totals
262        self.total_rd_bytes += rd_ops * rd_size
263        self.total_rd_ops += rd_ops
264        self.total_wr_bytes += wr_ops * wr_size
265        self.total_wr_ops += wr_ops
266        self.total_wr_merged += wr_merged
267        self.total_flush_ops += flush_ops + extra_flush
268        self.invalid_rd_ops += invalid_rd_ops
269        self.invalid_wr_ops += invalid_wr_ops
270        self.failed_rd_ops += failed_rd_ops
271        self.failed_wr_ops += failed_wr_ops
272
273        self.wr_highest_offset = max(self.wr_highest_offset, highest_offset)
274
275        # Advance the clock so idle_time_ns has a meaningful value
276        self.vm.qtest("clock_step %d" % nsec_per_sec)
277
278        # And check that the actual statistics match the expected ones
279        self.check_values()
280
281    def test_read_only(self):
282        test_values = [[512,    1],
283                       [65536,  1],
284                       [512,   12],
285                       [65536, 12]]
286        for i in test_values:
287            self.do_test_stats(rd_size = i[0], rd_ops = i[1])
288
289    def test_write_only(self):
290        test_values = [[512,    1],
291                       [65536,  1],
292                       [512,   12],
293                       [65536, 12]]
294        for i in test_values:
295            self.do_test_stats(wr_size = i[0], wr_ops = i[1])
296
297    def test_invalid(self):
298        self.do_test_stats(invalid_rd_ops = 7)
299        self.do_test_stats(invalid_wr_ops = 3)
300        self.do_test_stats(invalid_rd_ops = 4, invalid_wr_ops = 5)
301
302    def test_failed(self):
303        self.do_test_stats(failed_rd_ops = 8)
304        self.do_test_stats(failed_wr_ops = 6)
305        self.do_test_stats(failed_rd_ops = 5, failed_wr_ops = 12)
306
307    def test_flush(self):
308        self.do_test_stats(flush_ops = 8)
309
310    def test_all(self):
311        # rd_size, rd_ops, wr_size, wr_ops, flush_ops
312        # invalid_rd_ops,  invalid_wr_ops,
313        # failed_rd_ops,   failed_wr_ops
314        # wr_merged
315        test_values = [[512,    1, 512,   1, 1, 4, 7, 5, 2, 0],
316                       [65536,  1, 2048, 12, 7, 7, 5, 2, 5, 0],
317                       [32768,  9, 8192,  1, 4, 3, 2, 4, 6, 0],
318                       [16384, 11, 3584, 16, 9, 8, 6, 7, 3, 0]]
319        for i in test_values:
320            self.do_test_stats(*i)
321
322    def test_no_op(self):
323        # All values must be sane before doing any I/O
324        self.check_values()
325
326
327class BlockDeviceStatsTestAccountInvalid(BlockDeviceStatsTestCase):
328    account_invalid = True
329    account_failed = False
330
331class BlockDeviceStatsTestAccountFailed(BlockDeviceStatsTestCase):
332    account_invalid = False
333    account_failed = True
334
335class BlockDeviceStatsTestAccountBoth(BlockDeviceStatsTestCase):
336    account_invalid = True
337    account_failed = True
338
339class BlockDeviceStatsTestCoroutine(BlockDeviceStatsTestCase):
340    test_img = "null-co://"
341
342if __name__ == '__main__':
343    iotests.main(supported_fmts=["raw"])
344