40119effc5
This is the natural JSON representation and prevents us from having to decode the list manually. Signed-off-by: Alberto Garcia <berto@igalia.com> Message-id: 0e3da8fa206f4ab534ae3ce6086e75fe84f1557e.1447665472.git.berto@igalia.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
350 lines
14 KiB
Python
350 lines
14 KiB
Python
#!/usr/bin/env python
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#
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# Tests for block device statistics
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#
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# Copyright (C) 2015 Igalia, S.L.
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# Author: Alberto Garcia <berto@igalia.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import iotests
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import os
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interval_length = 10
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nsec_per_sec = 1000000000
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op_latency = nsec_per_sec / 1000 # See qtest_latency_ns in accounting.c
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bad_sector = 8192
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bad_offset = bad_sector * 512
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blkdebug_file = os.path.join(iotests.test_dir, 'blkdebug.conf')
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class BlockDeviceStatsTestCase(iotests.QMPTestCase):
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test_img = "null-aio://"
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total_rd_bytes = 0
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total_rd_ops = 0
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total_wr_bytes = 0
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total_wr_ops = 0
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total_wr_merged = 0
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total_flush_ops = 0
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failed_rd_ops = 0
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failed_wr_ops = 0
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invalid_rd_ops = 0
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invalid_wr_ops = 0
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wr_highest_offset = 0
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account_invalid = False
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account_failed = False
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def blockstats(self, device):
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result = self.vm.qmp("query-blockstats")
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for r in result['return']:
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if r['device'] == device:
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return r['stats']
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raise Exception("Device not found for blockstats: %s" % device)
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def create_blkdebug_file(self):
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file = open(blkdebug_file, 'w')
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file.write('''
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[inject-error]
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event = "read_aio"
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errno = "5"
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sector = "%d"
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[inject-error]
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event = "write_aio"
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errno = "5"
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sector = "%d"
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''' % (bad_sector, bad_sector))
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file.close()
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def setUp(self):
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drive_args = []
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drive_args.append("stats-intervals.0=%d" % interval_length)
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drive_args.append("stats-account-invalid=%s" %
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(self.account_invalid and "on" or "off"))
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drive_args.append("stats-account-failed=%s" %
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(self.account_failed and "on" or "off"))
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self.create_blkdebug_file()
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self.vm = iotests.VM().add_drive('blkdebug:%s:%s ' %
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(blkdebug_file, self.test_img),
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','.join(drive_args))
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self.vm.launch()
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# Set an initial value for the clock
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self.vm.qtest("clock_step %d" % nsec_per_sec)
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def tearDown(self):
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self.vm.shutdown()
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os.remove(blkdebug_file)
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def accounted_ops(self, read = False, write = False, flush = False):
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ops = 0
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if write:
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ops += self.total_wr_ops
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if self.account_failed:
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ops += self.failed_wr_ops
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if self.account_invalid:
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ops += self.invalid_wr_ops
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if read:
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ops += self.total_rd_ops
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if self.account_failed:
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ops += self.failed_rd_ops
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if self.account_invalid:
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ops += self.invalid_rd_ops
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if flush:
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ops += self.total_flush_ops
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return ops
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def accounted_latency(self, read = False, write = False, flush = False):
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latency = 0
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if write:
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latency += self.total_wr_ops * op_latency
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if self.account_failed:
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latency += self.failed_wr_ops * op_latency
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if read:
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latency += self.total_rd_ops * op_latency
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if self.account_failed:
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latency += self.failed_rd_ops * op_latency
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if flush:
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latency += self.total_flush_ops * op_latency
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return latency
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def check_values(self):
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stats = self.blockstats('drive0')
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# Check that the totals match with what we have calculated
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self.assertEqual(self.total_rd_bytes, stats['rd_bytes'])
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self.assertEqual(self.total_wr_bytes, stats['wr_bytes'])
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self.assertEqual(self.total_rd_ops, stats['rd_operations'])
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self.assertEqual(self.total_wr_ops, stats['wr_operations'])
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self.assertEqual(self.total_flush_ops, stats['flush_operations'])
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self.assertEqual(self.wr_highest_offset, stats['wr_highest_offset'])
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self.assertEqual(self.failed_rd_ops, stats['failed_rd_operations'])
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self.assertEqual(self.failed_wr_ops, stats['failed_wr_operations'])
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self.assertEqual(self.invalid_rd_ops, stats['invalid_rd_operations'])
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self.assertEqual(self.invalid_wr_ops, stats['invalid_wr_operations'])
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self.assertEqual(self.account_invalid, stats['account_invalid'])
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self.assertEqual(self.account_failed, stats['account_failed'])
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self.assertEqual(self.total_wr_merged, stats['wr_merged'])
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# Check that there's exactly one interval with the length we defined
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self.assertEqual(1, len(stats['timed_stats']))
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timed_stats = stats['timed_stats'][0]
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self.assertEqual(interval_length, timed_stats['interval_length'])
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total_rd_latency = self.accounted_latency(read = True)
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if (total_rd_latency != 0):
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self.assertEqual(total_rd_latency, stats['rd_total_time_ns'])
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self.assertEqual(op_latency, timed_stats['min_rd_latency_ns'])
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self.assertEqual(op_latency, timed_stats['max_rd_latency_ns'])
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self.assertEqual(op_latency, timed_stats['avg_rd_latency_ns'])
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self.assertLess(0, timed_stats['avg_rd_queue_depth'])
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else:
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self.assertEqual(0, stats['rd_total_time_ns'])
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self.assertEqual(0, timed_stats['min_rd_latency_ns'])
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self.assertEqual(0, timed_stats['max_rd_latency_ns'])
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self.assertEqual(0, timed_stats['avg_rd_latency_ns'])
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self.assertEqual(0, timed_stats['avg_rd_queue_depth'])
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# min read latency <= avg read latency <= max read latency
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self.assertLessEqual(timed_stats['min_rd_latency_ns'],
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timed_stats['avg_rd_latency_ns'])
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self.assertLessEqual(timed_stats['avg_rd_latency_ns'],
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timed_stats['max_rd_latency_ns'])
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total_wr_latency = self.accounted_latency(write = True)
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if (total_wr_latency != 0):
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self.assertEqual(total_wr_latency, stats['wr_total_time_ns'])
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self.assertEqual(op_latency, timed_stats['min_wr_latency_ns'])
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self.assertEqual(op_latency, timed_stats['max_wr_latency_ns'])
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self.assertEqual(op_latency, timed_stats['avg_wr_latency_ns'])
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self.assertLess(0, timed_stats['avg_wr_queue_depth'])
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else:
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self.assertEqual(0, stats['wr_total_time_ns'])
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self.assertEqual(0, timed_stats['min_wr_latency_ns'])
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self.assertEqual(0, timed_stats['max_wr_latency_ns'])
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self.assertEqual(0, timed_stats['avg_wr_latency_ns'])
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self.assertEqual(0, timed_stats['avg_wr_queue_depth'])
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# min write latency <= avg write latency <= max write latency
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self.assertLessEqual(timed_stats['min_wr_latency_ns'],
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timed_stats['avg_wr_latency_ns'])
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self.assertLessEqual(timed_stats['avg_wr_latency_ns'],
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timed_stats['max_wr_latency_ns'])
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total_flush_latency = self.accounted_latency(flush = True)
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if (total_flush_latency != 0):
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self.assertEqual(total_flush_latency, stats['flush_total_time_ns'])
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self.assertEqual(op_latency, timed_stats['min_flush_latency_ns'])
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self.assertEqual(op_latency, timed_stats['max_flush_latency_ns'])
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self.assertEqual(op_latency, timed_stats['avg_flush_latency_ns'])
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else:
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self.assertEqual(0, stats['flush_total_time_ns'])
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self.assertEqual(0, timed_stats['min_flush_latency_ns'])
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self.assertEqual(0, timed_stats['max_flush_latency_ns'])
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self.assertEqual(0, timed_stats['avg_flush_latency_ns'])
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# min flush latency <= avg flush latency <= max flush latency
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self.assertLessEqual(timed_stats['min_flush_latency_ns'],
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timed_stats['avg_flush_latency_ns'])
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self.assertLessEqual(timed_stats['avg_flush_latency_ns'],
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timed_stats['max_flush_latency_ns'])
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# idle_time_ns must be > 0 if we have performed any operation
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if (self.accounted_ops(read = True, write = True, flush = True) != 0):
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self.assertLess(0, stats['idle_time_ns'])
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else:
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self.assertFalse(stats.has_key('idle_time_ns'))
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# This test does not alter these, so they must be all 0
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self.assertEqual(0, stats['rd_merged'])
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self.assertEqual(0, stats['failed_flush_operations'])
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self.assertEqual(0, stats['invalid_flush_operations'])
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def do_test_stats(self, rd_size = 0, rd_ops = 0, wr_size = 0, wr_ops = 0,
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flush_ops = 0, invalid_rd_ops = 0, invalid_wr_ops = 0,
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failed_rd_ops = 0, failed_wr_ops = 0, wr_merged = 0):
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# The 'ops' list will contain all the requested I/O operations
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ops = []
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for i in range(rd_ops):
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ops.append("aio_read %d %d" % (i * rd_size, rd_size))
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for i in range(wr_ops):
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ops.append("aio_write %d %d" % (i * wr_size, wr_size))
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for i in range(flush_ops):
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ops.append("aio_flush")
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highest_offset = wr_ops * wr_size
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# Two types of invalid operations: unaligned length and unaligned offset
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for i in range(invalid_rd_ops / 2):
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ops.append("aio_read 0 511")
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for i in range(invalid_rd_ops / 2, invalid_rd_ops):
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ops.append("aio_read 13 512")
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for i in range(invalid_wr_ops / 2):
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ops.append("aio_write 0 511")
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for i in range(invalid_wr_ops / 2, invalid_wr_ops):
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ops.append("aio_write 13 512")
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for i in range(failed_rd_ops):
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ops.append("aio_read %d 512" % bad_offset)
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for i in range(failed_wr_ops):
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ops.append("aio_write %d 512" % bad_offset)
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if failed_wr_ops > 0:
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highest_offset = max(highest_offset, bad_offset + 512)
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for i in range(wr_merged):
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first = i * wr_size * 2
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second = first + wr_size
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ops.append("multiwrite %d %d ; %d %d" %
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(first, wr_size, second, wr_size))
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highest_offset = max(highest_offset, wr_merged * wr_size * 2)
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# Now perform all operations
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for op in ops:
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self.vm.hmp_qemu_io("drive0", op)
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# Update the expected totals
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self.total_rd_bytes += rd_ops * rd_size
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self.total_rd_ops += rd_ops
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self.total_wr_bytes += wr_ops * wr_size
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self.total_wr_ops += wr_ops
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self.total_wr_merged += wr_merged
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self.total_flush_ops += flush_ops
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self.invalid_rd_ops += invalid_rd_ops
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self.invalid_wr_ops += invalid_wr_ops
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self.failed_rd_ops += failed_rd_ops
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self.failed_wr_ops += failed_wr_ops
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self.wr_highest_offset = max(self.wr_highest_offset, highest_offset)
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# Advance the clock so idle_time_ns has a meaningful value
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self.vm.qtest("clock_step %d" % nsec_per_sec)
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# And check that the actual statistics match the expected ones
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self.check_values()
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def test_read_only(self):
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test_values = [[512, 1],
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[65536, 1],
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[512, 12],
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[65536, 12]]
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for i in test_values:
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self.do_test_stats(rd_size = i[0], rd_ops = i[1])
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def test_write_only(self):
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test_values = [[512, 1],
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[65536, 1],
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[512, 12],
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[65536, 12]]
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for i in test_values:
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self.do_test_stats(wr_size = i[0], wr_ops = i[1])
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def test_invalid(self):
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self.do_test_stats(invalid_rd_ops = 7)
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self.do_test_stats(invalid_wr_ops = 3)
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self.do_test_stats(invalid_rd_ops = 4, invalid_wr_ops = 5)
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def test_failed(self):
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self.do_test_stats(failed_rd_ops = 8)
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self.do_test_stats(failed_wr_ops = 6)
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self.do_test_stats(failed_rd_ops = 5, failed_wr_ops = 12)
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def test_flush(self):
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self.do_test_stats(flush_ops = 8)
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def test_merged(self):
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for i in range(5):
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self.do_test_stats(wr_merged = i * 3)
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def test_all(self):
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# rd_size, rd_ops, wr_size, wr_ops, flush_ops
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# invalid_rd_ops, invalid_wr_ops,
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# failed_rd_ops, failed_wr_ops
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# wr_merged
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test_values = [[512, 1, 512, 1, 1, 4, 7, 5, 2, 1],
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[65536, 1, 2048, 12, 7, 7, 5, 2, 5, 5],
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[32768, 9, 8192, 1, 4, 3, 2, 4, 6, 4],
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[16384, 11, 3584, 16, 9, 8, 6, 7, 3, 4]]
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for i in test_values:
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self.do_test_stats(*i)
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def test_no_op(self):
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# All values must be sane before doing any I/O
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self.check_values()
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class BlockDeviceStatsTestAccountInvalid(BlockDeviceStatsTestCase):
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account_invalid = True
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account_failed = False
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class BlockDeviceStatsTestAccountFailed(BlockDeviceStatsTestCase):
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account_invalid = False
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account_failed = True
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class BlockDeviceStatsTestAccountBoth(BlockDeviceStatsTestCase):
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account_invalid = True
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account_failed = True
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class BlockDeviceStatsTestCoroutine(BlockDeviceStatsTestCase):
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test_img = "null-co://"
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if __name__ == '__main__':
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iotests.main(supported_fmts=["raw"])
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